* [hnaz-mm:master 344/410] mm/mmap.c:1214:2: warning: Value stored to 'prev' is never read [clang-analyzer-deadcode.DeadStores]
@ 2022-04-30 4:41 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2022-04-30 4:41 UTC (permalink / raw)
To: kbuild
[-- Attachment #1: Type: text/plain, Size: 51883 bytes --]
CC: llvm(a)lists.linux.dev
CC: kbuild-all(a)lists.01.org
BCC: lkp(a)intel.com
CC: linux-kernel(a)vger.kernel.org
TO: Andrew Morton <akpm@linux-foundation.org>
CC: Linux Memory Management List <linux-mm@kvack.org>
CC: Johannes Weiner <hannes@cmpxchg.org>
Hi Andrew,
First bad commit (maybe != root cause):
tree: https://github.com/hnaz/linux-mm master
head: bf4803abaa3e9d2fa207c0675a2d2abf0fd44f66
commit: 6b3cc214cfc53b4a25c450878a054f35c54152a8 [344/410] mapletree-vs-khugepaged
:::::: branch date: 3 days ago
:::::: commit date: 3 days ago
config: x86_64-randconfig-c007 (https://download.01.org/0day-ci/archive/20220430/202204301252.MRpyQpHS-lkp(a)intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 400775649969b9baf3bc2a510266e7912bb16ae9)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/hnaz/linux-mm/commit/6b3cc214cfc53b4a25c450878a054f35c54152a8
git remote add hnaz-mm https://github.com/hnaz/linux-mm
git fetch --no-tags hnaz-mm master
git checkout 6b3cc214cfc53b4a25c450878a054f35c54152a8
# save the config file
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 clang-analyzer
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
clang-analyzer warnings: (new ones prefixed by >>)
arch/x86/include/asm/paravirt_types.h:404:16: note: expanded from macro 'PVOP_CALL_ARGS'
unsigned long __edi = __edi, __esi = __esi, \
^ ~~~~~
arch/x86/mm/tlb.c:1260:8: warning: Call to function 'sprintf' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'sprintf_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
len = sprintf(buf, "%ld\n", tlb_single_page_flush_ceiling);
^~~~~~~
arch/x86/mm/tlb.c:1260:8: note: Call to function 'sprintf' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'sprintf_s' in case of C11
len = sprintf(buf, "%ld\n", tlb_single_page_flush_ceiling);
^~~~~~~
Suppressed 42 warnings (42 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
33 warnings generated.
Suppressed 33 warnings (33 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
36 warnings generated.
Suppressed 36 warnings (36 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
38 warnings generated.
ipc/msgutil.c:128:2: warning: Call to function 'memcpy' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memcpy_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
memcpy(dst + 1, src + 1, alen);
^
include/linux/fortify-string.h:369:26: note: expanded from macro 'memcpy'
#define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:362:2: note: expanded from macro '__fortify_memcpy_chk'
__underlying_##op(p, q, __fortify_size); \
^~~~~~~~~~~~~~~~~
note: expanded from here
include/linux/fortify-string.h:45:29: note: expanded from macro '__underlying_memcpy'
#define __underlying_memcpy __builtin_memcpy
^~~~~~~~~~~~~~~~
ipc/msgutil.c:128:2: note: Call to function 'memcpy' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memcpy_s' in case of C11
memcpy(dst + 1, src + 1, alen);
^
include/linux/fortify-string.h:369:26: note: expanded from macro 'memcpy'
#define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:362:2: note: expanded from macro '__fortify_memcpy_chk'
__underlying_##op(p, q, __fortify_size); \
^~~~~~~~~~~~~~~~~
note: expanded from here
include/linux/fortify-string.h:45:29: note: expanded from macro '__underlying_memcpy'
#define __underlying_memcpy __builtin_memcpy
^~~~~~~~~~~~~~~~
ipc/msgutil.c:136:3: warning: Call to function 'memcpy' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memcpy_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
memcpy(dst_pseg + 1, src_pseg + 1, alen);
^
include/linux/fortify-string.h:369:26: note: expanded from macro 'memcpy'
#define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:362:2: note: expanded from macro '__fortify_memcpy_chk'
__underlying_##op(p, q, __fortify_size); \
^~~~~~~~~~~~~~~~~
note: expanded from here
include/linux/fortify-string.h:45:29: note: expanded from macro '__underlying_memcpy'
#define __underlying_memcpy __builtin_memcpy
^~~~~~~~~~~~~~~~
ipc/msgutil.c:136:3: note: Call to function 'memcpy' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memcpy_s' in case of C11
memcpy(dst_pseg + 1, src_pseg + 1, alen);
^
include/linux/fortify-string.h:369:26: note: expanded from macro 'memcpy'
#define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:362:2: note: expanded from macro '__fortify_memcpy_chk'
__underlying_##op(p, q, __fortify_size); \
^~~~~~~~~~~~~~~~~
note: expanded from here
include/linux/fortify-string.h:45:29: note: expanded from macro '__underlying_memcpy'
#define __underlying_memcpy __builtin_memcpy
^~~~~~~~~~~~~~~~
Suppressed 36 warnings (36 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
45 warnings generated.
Suppressed 45 warnings (44 in non-user code, 1 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
46 warnings generated.
mm/sparse-vmemmap.c:573:2: warning: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
memset(p, 0, size);
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
mm/sparse-vmemmap.c:573:2: note: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11
memset(p, 0, size);
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
>> mm/sparse-vmemmap.c:740:17: warning: Value stored to 'next' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
unsigned long next = addr, last = addr + size;
^~~~ ~~~~
mm/sparse-vmemmap.c:740:17: note: Value stored to 'next' during its initialization is never read
unsigned long next = addr, last = addr + size;
^~~~ ~~~~
Suppressed 44 warnings (44 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
36 warnings generated.
Suppressed 36 warnings (36 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
62 warnings generated.
fs/ecryptfs/crypto.c:92:2: warning: Call to function 'snprintf' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'snprintf_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
snprintf((*algified_name), algified_name_len, "%s(%s)",
^~~~~~~~
fs/ecryptfs/crypto.c:92:2: note: Call to function 'snprintf' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'snprintf_s' in case of C11
snprintf((*algified_name), algified_name_len, "%s(%s)",
^~~~~~~~
fs/ecryptfs/crypto.c:125:2: warning: Call to function 'memcpy' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memcpy_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
memcpy(src, crypt_stat->root_iv, crypt_stat->iv_bytes);
^
include/linux/fortify-string.h:369:26: note: expanded from macro 'memcpy'
#define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:362:2: note: expanded from macro '__fortify_memcpy_chk'
__underlying_##op(p, q, __fortify_size); \
^~~~~~~~~~~~~~~~~
note: expanded from here
include/linux/fortify-string.h:45:29: note: expanded from macro '__underlying_memcpy'
#define __underlying_memcpy __builtin_memcpy
^~~~~~~~~~~~~~~~
fs/ecryptfs/crypto.c:125:2: note: Call to function 'memcpy' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memcpy_s' in case of C11
memcpy(src, crypt_stat->root_iv, crypt_stat->iv_bytes);
^
include/linux/fortify-string.h:369:26: note: expanded from macro 'memcpy'
#define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:362:2: note: expanded from macro '__fortify_memcpy_chk'
__underlying_##op(p, q, __fortify_size); \
^~~~~~~~~~~~~~~~~
note: expanded from here
include/linux/fortify-string.h:45:29: note: expanded from macro '__underlying_memcpy'
#define __underlying_memcpy __builtin_memcpy
^~~~~~~~~~~~~~~~
fs/ecryptfs/crypto.c:126:2: warning: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
memset((src + crypt_stat->iv_bytes), 0, 16);
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
fs/ecryptfs/crypto.c:126:2: note: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11
memset((src + crypt_stat->iv_bytes), 0, 16);
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
fs/ecryptfs/crypto.c:127:2: warning: Call to function 'snprintf' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'snprintf_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
snprintf((src + crypt_stat->iv_bytes), 16, "%lld", offset);
^~~~~~~~
fs/ecryptfs/crypto.c:127:2: note: Call to function 'snprintf' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'snprintf_s' in case of C11
snprintf((src + crypt_stat->iv_bytes), 16, "%lld", offset);
^~~~~~~~
fs/ecryptfs/crypto.c:139:2: warning: Call to function 'memcpy' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memcpy_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
memcpy(iv, dst, crypt_stat->iv_bytes);
^
include/linux/fortify-string.h:369:26: note: expanded from macro 'memcpy'
#define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:362:2: note: expanded from macro '__fortify_memcpy_chk'
__underlying_##op(p, q, __fortify_size); \
^~~~~~~~~~~~~~~~~
note: expanded from here
include/linux/fortify-string.h:45:29: note: expanded from macro '__underlying_memcpy'
#define __underlying_memcpy __builtin_memcpy
^~~~~~~~~~~~~~~~
fs/ecryptfs/crypto.c:139:2: note: Call to function 'memcpy' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memcpy_s' in case of C11
memcpy(iv, dst, crypt_stat->iv_bytes);
^
include/linux/fortify-string.h:369:26: note: expanded from macro 'memcpy'
#define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:362:2: note: expanded from macro '__fortify_memcpy_chk'
__underlying_##op(p, q, __fortify_size); \
^~~~~~~~~~~~~~~~~
note: expanded from here
include/linux/fortify-string.h:45:29: note: expanded from macro '__underlying_memcpy'
#define __underlying_memcpy __builtin_memcpy
^~~~~~~~~~~~~~~~
fs/ecryptfs/crypto.c:168:2: warning: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
--
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
drivers/input/rmi4/rmi_f34v7.c:84:2: note: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11
memset(&data_1_5, 0, sizeof(data_1_5));
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
drivers/input/rmi4/rmi_f34v7.c:532:3: warning: Call to function 'snprintf' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'snprintf_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
snprintf(f34->configuration_id, sizeof(f34->configuration_id),
^~~~~~~~
drivers/input/rmi4/rmi_f34v7.c:532:3: note: Call to function 'snprintf' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'snprintf_s' in case of C11
snprintf(f34->configuration_id, sizeof(f34->configuration_id),
^~~~~~~~
drivers/input/rmi4/rmi_f34v7.c:1158:2: warning: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
memset(&f34->v7.img, 0x00, sizeof(f34->v7.img));
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
drivers/input/rmi4/rmi_f34v7.c:1158:2: note: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11
memset(&f34->v7.img, 0x00, sizeof(f34->v7.img));
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
drivers/input/rmi4/rmi_f34v7.c:1378:2: warning: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
memset(&f34->v7.blkcount, 0x00, sizeof(f34->v7.blkcount));
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
drivers/input/rmi4/rmi_f34v7.c:1378:2: note: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11
memset(&f34->v7.blkcount, 0x00, sizeof(f34->v7.blkcount));
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
drivers/input/rmi4/rmi_f34v7.c:1379:2: warning: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
memset(&f34->v7.phyaddr, 0x00, sizeof(f34->v7.phyaddr));
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
drivers/input/rmi4/rmi_f34v7.c:1379:2: note: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11
memset(&f34->v7.phyaddr, 0x00, sizeof(f34->v7.phyaddr));
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
Suppressed 36 warnings (36 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
45 warnings generated.
>> mm/mlock.c:535:3: warning: Value stored to 'mm' is never read [clang-analyzer-deadcode.DeadStores]
mm = current->mm;
^
mm/mlock.c:535:3: note: Value stored to 'mm' is never read
Suppressed 44 warnings (44 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
41 warnings generated.
drivers/iommu/iommu.c:420:9: warning: Call to function 'sprintf' is insecure as it does not provide bounding of the memory buffer or security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'sprintf_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
return sprintf(buf, "%s\n", group->name);
^~~~~~~
drivers/iommu/iommu.c:420:9: note: Call to function 'sprintf' is insecure as it does not provide bounding of the memory buffer or security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'sprintf_s' in case of C11
return sprintf(buf, "%s\n", group->name);
^~~~~~~
drivers/iommu/iommu.c:532:10: warning: Call to function 'sprintf' is insecure as it does not provide bounding of the memory buffer or security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'sprintf_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
str += sprintf(str, "0x%016llx 0x%016llx %s\n",
^~~~~~~
drivers/iommu/iommu.c:532:10: note: Call to function 'sprintf' is insecure as it does not provide bounding of the memory buffer or security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'sprintf_s' in case of C11
str += sprintf(str, "0x%016llx 0x%016llx %s\n",
^~~~~~~
drivers/iommu/iommu.c:569:2: warning: Call to function 'strcpy' is insecure as it does not provide bounding of the memory buffer. Replace unbounded copy functions with analogous functions that support length arguments such as 'strlcpy'. CWE-119 [clang-analyzer-security.insecureAPI.strcpy]
strcpy(buf, type);
^~~~~~
drivers/iommu/iommu.c:569:2: note: Call to function 'strcpy' is insecure as it does not provide bounding of the memory buffer. Replace unbounded copy functions with analogous functions that support length arguments such as 'strlcpy'. CWE-119
strcpy(buf, type);
^~~~~~
drivers/iommu/iommu.c:1729:2: warning: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
memset(>ype, 0, sizeof(gtype));
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
drivers/iommu/iommu.c:1729:2: note: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11
memset(>ype, 0, sizeof(gtype));
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
include/linux/iommu.h:407:9: warning: Access to field 'iommu_dev' results in a dereference of a null pointer (loaded from field 'iommu') [clang-analyzer-core.NullDereference]
return dev->iommu->iommu_dev->ops;
^
drivers/iommu/iommu.c:1655:6: note: Assuming 'action' is equal to BUS_NOTIFY_ADD_DEVICE
if (action == BUS_NOTIFY_ADD_DEVICE) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/iommu/iommu.c:1655:2: note: Taking true branch
if (action == BUS_NOTIFY_ADD_DEVICE) {
^
drivers/iommu/iommu.c:1658:9: note: Calling 'iommu_probe_device'
ret = iommu_probe_device(dev);
^~~~~~~~~~~~~~~~~~~~~~~
drivers/iommu/iommu.c:278:8: note: Calling '__iommu_probe_device'
ret = __iommu_probe_device(dev, NULL);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/iommu/iommu.c:227:6: note: Assuming 'ops' is non-null
if (!ops)
^~~~
drivers/iommu/iommu.c:227:2: note: Taking false branch
if (!ops)
^
drivers/iommu/iommu.c:230:7: note: Calling 'dev_iommu_get'
if (!dev_iommu_get(dev))
^~~~~~~~~~~~~~~~~~
drivers/iommu/iommu.c:196:6: note: Assuming 'param' is non-null
if (param)
^~~~~
drivers/iommu/iommu.c:196:2: note: Taking true branch
if (param)
^
drivers/iommu/iommu.c:197:3: note: Returning without writing to 'dev->iommu'
return param;
^
drivers/iommu/iommu.c:230:7: note: Returning from 'dev_iommu_get'
if (!dev_iommu_get(dev))
^~~~~~~~~~~~~~~~~~
drivers/iommu/iommu.c:230:2: note: Taking false branch
if (!dev_iommu_get(dev))
^
drivers/iommu/iommu.c:233:6: note: Assuming the condition is false
if (!try_module_get(ops->owner)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/iommu/iommu.c:233:2: note: Taking false branch
if (!try_module_get(ops->owner)) {
^
drivers/iommu/iommu.c:239:2: note: Taking true branch
if (IS_ERR(iommu_dev)) {
^
drivers/iommu/iommu.c:241:3: note: Control jumps to line 264
goto out_module_put;
^
drivers/iommu/iommu.c:267:2: note: Calling 'dev_iommu_free'
--
fs/select.c:997:7: note: Assuming the condition is false
if (copy_from_user(walk->entries, ufds + nfds-todo,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/select.c:997:3: note: Taking false branch
if (copy_from_user(walk->entries, ufds + nfds-todo,
^
fs/select.c:1002:8: note: 'todo' is 0
if (!todo)
^~~~
fs/select.c:1002:3: note: Taking true branch
if (!todo)
^
fs/select.c:1003:4: note: Execution continues on line 1014
break;
^
fs/select.c:1015:12: note: Calling 'do_poll'
fdcount = do_poll(head, &table, end_time);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/select.c:892:23: note: Assuming the condition is false
__poll_t busy_flag = net_busy_loop_on() ? POLL_BUSY_LOOP : 0;
^~~~~~~~~~~~~~~~~~
fs/select.c:892:23: note: '?' condition is false
fs/select.c:896:6: note: 'end_time' is null
if (end_time && !end_time->tv_sec && !end_time->tv_nsec) {
^~~~~~~~
fs/select.c:896:15: note: Left side of '&&' is false
if (end_time && !end_time->tv_sec && !end_time->tv_nsec) {
^
fs/select.c:901:6: note: 'end_time' is null
if (end_time && !timed_out)
^~~~~~~~
fs/select.c:901:15: note: Left side of '&&' is false
if (end_time && !timed_out)
^
fs/select.c:904:2: note: Loop condition is true. Entering loop body
for (;;) {
^
fs/select.c:908:3: note: Loop condition is true. Entering loop body
for (walk = list; walk != NULL; walk = walk->next) {
^
fs/select.c:913:11: note: 'pfd' is not equal to 'pfd_end'
for (; pfd != pfd_end; pfd++) {
^~~
fs/select.c:913:4: note: Loop condition is true. Entering loop body
for (; pfd != pfd_end; pfd++) {
^
fs/select.c:921:9: note: Calling 'do_pollfd'
if (do_pollfd(pfd, pt, &can_busy_loop,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/select.c:859:2: note: Assigned value is garbage or undefined
int fd = pollfd->fd;
^ ~~~~~~~~~~
Suppressed 90 warnings (90 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
54 warnings generated.
arch/x86/include/asm/paravirt.h:97:2: warning: Assigned value is garbage or undefined [clang-analyzer-core.uninitialized.Assign]
PVOP_VCALL1(mmu.exit_mmap, mm);
^
arch/x86/include/asm/paravirt_types.h:530:2: note: expanded from macro 'PVOP_VCALL1'
__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1))
^
arch/x86/include/asm/paravirt_types.h:491:8: note: expanded from macro '__PVOP_VCALL'
(void)____PVOP_CALL(, op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \
^
arch/x86/include/asm/paravirt_types.h:446:3: note: expanded from macro '____PVOP_CALL'
PVOP_CALL_ARGS; \
^
arch/x86/include/asm/paravirt_types.h:404:16: note: expanded from macro 'PVOP_CALL_ARGS'
unsigned long __edi = __edi, __esi = __esi, \
^
mm/mmap.c:3117:6: note: Assuming the condition is false
if (unlikely(mm_is_oom_victim(mm))) {
^
include/linux/compiler.h:78:22: note: expanded from macro 'unlikely'
# define unlikely(x) __builtin_expect(!!(x), 0)
^~~~~~~~~~~~~~~~~~~~~~~~~~
mm/mmap.c:3117:2: note: Taking false branch
if (unlikely(mm_is_oom_victim(mm))) {
^
mm/mmap.c:3134:2: note: Calling 'arch_exit_mmap'
arch_exit_mmap(mm);
^~~~~~~~~~~~~~~~~~
arch/x86/include/asm/mmu_context.h:176:2: note: Calling 'paravirt_arch_exit_mmap'
paravirt_arch_exit_mmap(mm);
^~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/include/asm/paravirt.h:97:2: note: Assigned value is garbage or undefined
PVOP_VCALL1(mmu.exit_mmap, mm);
^
arch/x86/include/asm/paravirt_types.h:530:2: note: expanded from macro 'PVOP_VCALL1'
__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/include/asm/paravirt_types.h:491:8: note: expanded from macro '__PVOP_VCALL'
(void)____PVOP_CALL(, op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/include/asm/paravirt_types.h:446:3: note: expanded from macro '____PVOP_CALL'
PVOP_CALL_ARGS; \
^~~~~~~~~~~~~~
arch/x86/include/asm/paravirt_types.h:404:16: note: expanded from macro 'PVOP_CALL_ARGS'
unsigned long __edi = __edi, __esi = __esi, \
^ ~~~~~
>> mm/mmap.c:1214:2: warning: Value stored to 'prev' is never read [clang-analyzer-deadcode.DeadStores]
prev = mas_prev(&mas, 0);
^ ~~~~~~~~~~~~~~~~~
mm/mmap.c:1214:2: note: Value stored to 'prev' is never read
prev = mas_prev(&mas, 0);
^ ~~~~~~~~~~~~~~~~~
mm/mmap.c:3230:3: warning: Value stored to 'faulted_in_anon_vma' is never read [clang-analyzer-deadcode.DeadStores]
faulted_in_anon_vma = false;
^ ~~~~~
mm/mmap.c:3230:3: note: Value stored to 'faulted_in_anon_vma' is never read
faulted_in_anon_vma = false;
^ ~~~~~
mm/mmap.c:3688:2: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores]
ret = percpu_counter_init(&vm_committed_as, 0, GFP_KERNEL);
^
mm/mmap.c:3688:2: note: Value stored to 'ret' is never read
Suppressed 50 warnings (50 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
74 warnings generated.
net/core/flow_offload.c:208:2: warning: Call to function 'memcpy' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memcpy_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
memcpy(cookie->cookie, data, len);
^
include/linux/fortify-string.h:369:26: note: expanded from macro 'memcpy'
#define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:362:2: note: expanded from macro '__fortify_memcpy_chk'
__underlying_##op(p, q, __fortify_size); \
^~~~~~~~~~~~~~~~~
note: expanded from here
include/linux/fortify-string.h:45:29: note: expanded from macro '__underlying_memcpy'
#define __underlying_memcpy __builtin_memcpy
^~~~~~~~~~~~~~~~
net/core/flow_offload.c:208:2: note: Call to function 'memcpy' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memcpy_s' in case of C11
memcpy(cookie->cookie, data, len);
^
include/linux/fortify-string.h:369:26: note: expanded from macro 'memcpy'
#define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:362:2: note: expanded from macro '__fortify_memcpy_chk'
__underlying_##op(p, q, __fortify_size); \
^~~~~~~~~~~~~~~~~
note: expanded from here
include/linux/fortify-string.h:45:29: note: expanded from macro '__underlying_memcpy'
#define __underlying_memcpy __builtin_memcpy
^~~~~~~~~~~~~~~~
net/core/flow_offload.c:388:3: warning: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
memset(&bo, 0, sizeof(bo));
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
net/core/flow_offload.c:388:3: note: Call to function 'memset' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memset_s' in case of C11
memset(&bo, 0, sizeof(bo));
^
include/linux/fortify-string.h:272:25: note: expanded from macro 'memset'
#define memset(p, c, s) __fortify_memset_chk(p, c, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:265:2: note: expanded from macro '__fortify_memset_chk'
__underlying_memset(p, c, __fortify_size); \
^~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:47:29: note: expanded from macro '__underlying_memset'
#define __underlying_memset __builtin_memset
^~~~~~~~~~~~~~~~
Suppressed 72 warnings (72 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
45 warnings generated.
Suppressed 45 warnings (45 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
46 warnings generated.
fs/xfs/libxfs/xfs_attr.c:1243:2: warning: Value stored to 'error' is never read [clang-analyzer-deadcode.DeadStores]
error = xfs_attr_node_removename(args, state);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/xfs/libxfs/xfs_attr.c:1243:2: note: Value stored to 'error' is never read
error = xfs_attr_node_removename(args, state);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Suppressed 45 warnings (45 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
82 warnings generated.
fs/xfs/libxfs/xfs_attr_leaf.c:510:2: warning: Call to function 'memcpy' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memcpy_s' in case of C11 [clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
memcpy(args->value, value, valuelen);
^
include/linux/fortify-string.h:369:26: note: expanded from macro 'memcpy'
#define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:362:2: note: expanded from macro '__fortify_memcpy_chk'
__underlying_##op(p, q, __fortify_size); \
^~~~~~~~~~~~~~~~~
note: expanded from here
include/linux/fortify-string.h:45:29: note: expanded from macro '__underlying_memcpy'
#define __underlying_memcpy __builtin_memcpy
^~~~~~~~~~~~~~~~
fs/xfs/libxfs/xfs_attr_leaf.c:510:2: note: Call to function 'memcpy' is insecure as it does not provide security checks introduced in the C11 standard. Replace with analogous functions that support length arguments or provides boundary checks such as 'memcpy_s' in case of C11
memcpy(args->value, value, valuelen);
^
include/linux/fortify-string.h:369:26: note: expanded from macro 'memcpy'
vim +/prev +1214 mm/mmap.c
d0e9fe1758f222 Linus Torvalds 2010-04-10 1191
^1da177e4c3f41 Linus Torvalds 2005-04-16 1192 /*
^1da177e4c3f41 Linus Torvalds 2005-04-16 1193 * find_mergeable_anon_vma is used by anon_vma_prepare, to check
^1da177e4c3f41 Linus Torvalds 2005-04-16 1194 * neighbouring vmas for a suitable anon_vma, before it goes off
^1da177e4c3f41 Linus Torvalds 2005-04-16 1195 * to allocate a new anon_vma. It checks because a repetitive
^1da177e4c3f41 Linus Torvalds 2005-04-16 1196 * sequence of mprotects and faults may otherwise lead to distinct
^1da177e4c3f41 Linus Torvalds 2005-04-16 1197 * anon_vmas being allocated, preventing vma merge in subsequent
^1da177e4c3f41 Linus Torvalds 2005-04-16 1198 * mprotect.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1199 */
^1da177e4c3f41 Linus Torvalds 2005-04-16 1200 struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *vma)
^1da177e4c3f41 Linus Torvalds 2005-04-16 1201 {
7ecb5aaf015a98 Liam R. Howlett 2022-04-26 1202 MA_STATE(mas, &vma->vm_mm->mm_mt, vma->vm_end, vma->vm_end);
a67c8caae98f16 Miaohe Lin 2020-01-30 1203 struct anon_vma *anon_vma = NULL;
7ecb5aaf015a98 Liam R. Howlett 2022-04-26 1204 struct vm_area_struct *prev, *next;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1205
a67c8caae98f16 Miaohe Lin 2020-01-30 1206 /* Try next first. */
7ecb5aaf015a98 Liam R. Howlett 2022-04-26 1207 next = mas_walk(&mas);
7ecb5aaf015a98 Liam R. Howlett 2022-04-26 1208 if (next) {
7ecb5aaf015a98 Liam R. Howlett 2022-04-26 1209 anon_vma = reusable_anon_vma(next, vma, next);
d0e9fe1758f222 Linus Torvalds 2010-04-10 1210 if (anon_vma)
d0e9fe1758f222 Linus Torvalds 2010-04-10 1211 return anon_vma;
a67c8caae98f16 Miaohe Lin 2020-01-30 1212 }
a67c8caae98f16 Miaohe Lin 2020-01-30 1213
7ecb5aaf015a98 Liam R. Howlett 2022-04-26 @1214 prev = mas_prev(&mas, 0);
7ecb5aaf015a98 Liam R. Howlett 2022-04-26 1215 VM_BUG_ON_VMA(prev != vma, vma);
7ecb5aaf015a98 Liam R. Howlett 2022-04-26 1216 prev = mas_prev(&mas, 0);
a67c8caae98f16 Miaohe Lin 2020-01-30 1217 /* Try prev next. */
7ecb5aaf015a98 Liam R. Howlett 2022-04-26 1218 if (prev)
7ecb5aaf015a98 Liam R. Howlett 2022-04-26 1219 anon_vma = reusable_anon_vma(prev, prev, vma);
^1da177e4c3f41 Linus Torvalds 2005-04-16 1220
^1da177e4c3f41 Linus Torvalds 2005-04-16 1221 /*
a67c8caae98f16 Miaohe Lin 2020-01-30 1222 * We might reach here with anon_vma == NULL if we can't find
a67c8caae98f16 Miaohe Lin 2020-01-30 1223 * any reusable anon_vma.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1224 * There's no absolute need to look only at touching neighbours:
^1da177e4c3f41 Linus Torvalds 2005-04-16 1225 * we could search further afield for "compatible" anon_vmas.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1226 * But it would probably just be a waste of time searching,
^1da177e4c3f41 Linus Torvalds 2005-04-16 1227 * or lead to too many vmas hanging off the same anon_vma.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1228 * We're trying to allow mprotect remerging later on,
^1da177e4c3f41 Linus Torvalds 2005-04-16 1229 * not trying to minimize memory used for anon_vmas.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1230 */
a67c8caae98f16 Miaohe Lin 2020-01-30 1231 return anon_vma;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1232 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1233
:::::: The code at line 1214 was first introduced by commit
:::::: 7ecb5aaf015a98afe2a4ecc0a647f636995390ac mm: remove the vma linked list
:::::: TO: Liam R. Howlett <Liam.Howlett@Oracle.com>
:::::: CC: Johannes Weiner <hannes@cmpxchg.org>
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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2022-04-30 4:41 [hnaz-mm:master 344/410] mm/mmap.c:1214:2: warning: Value stored to 'prev' is never read [clang-analyzer-deadcode.DeadStores] kernel test robot
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