* [kas:uffd/rfc-v2 3/7] include/linux/userfaultfd_k.h:167:55: warning: shift count >= width of type
@ 2026-04-19 0:15 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-04-19 0:15 UTC (permalink / raw)
To: Kiryl Shutsemau (Meta); +Cc: llvm, oe-kbuild-all
tree: https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git uffd/rfc-v2
head: 8f55f0ce2de130272cb80eee2434a185922b3340
commit: a5a0f28bfc37d5fb52d9268238be0f8280ca737c [3/7] userfaultfd: add UFFDIO_REGISTER_MODE_RWP
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20260419/202604190854.w97I47Zr-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260419/202604190854.w97I47Zr-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604190854.w97I47Zr-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from fs/exec.c:82:
In file included from fs/../mm/internal.h:13:
In file included from include/linux/mm_inline.h:10:
>> include/linux/userfaultfd_k.h:167:55: warning: shift count >= width of type [-Wshift-count-overflow]
167 | return vma->vm_flags & (VM_UFFD_WP | VM_UFFD_MINOR | VM_UFFD_RWP);
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
In file included from fs/exec.c:82:
In file included from fs/../mm/internal.h:13:
In file included from include/linux/mm_inline.h:10:
include/linux/userfaultfd_k.h:199:25: warning: shift count >= width of type [-Wshift-count-overflow]
199 | return vma->vm_flags & VM_UFFD_RWP;
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
In file included from fs/exec.c:82:
In file included from fs/../mm/internal.h:13:
In file included from include/linux/mm_inline.h:10:
include/linux/userfaultfd_k.h:216:25: warning: shift count >= width of type [-Wshift-count-overflow]
216 | return vma->vm_flags & __VM_UFFD_FLAGS;
| ^~~~~~~~~~~~~~~
include/linux/userfaultfd_k.h:25:5: note: expanded from macro '__VM_UFFD_FLAGS'
25 | VM_UFFD_RWP)
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
In file included from fs/exec.c:82:
In file included from fs/../mm/internal.h:13:
In file included from include/linux/mm_inline.h:10:
include/linux/userfaultfd_k.h:223:14: warning: shift count >= width of type [-Wshift-count-overflow]
223 | vm_flags &= __VM_UFFD_FLAGS;
| ^~~~~~~~~~~~~~~
include/linux/userfaultfd_k.h:25:5: note: expanded from macro '__VM_UFFD_FLAGS'
25 | VM_UFFD_RWP)
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
In file included from fs/exec.c:82:
In file included from fs/../mm/internal.h:13:
In file included from include/linux/mm_inline.h:10:
include/linux/userfaultfd_k.h:237:15: warning: shift count >= width of type [-Wshift-count-overflow]
237 | vm_flags &= ~VM_UFFD_RWP;
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
5 warnings generated.
--
In file included from fs/userfaultfd.c:18:
In file included from include/linux/mm_inline.h:10:
>> include/linux/userfaultfd_k.h:167:55: warning: shift count >= width of type [-Wshift-count-overflow]
167 | return vma->vm_flags & (VM_UFFD_WP | VM_UFFD_MINOR | VM_UFFD_RWP);
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
In file included from fs/userfaultfd.c:18:
In file included from include/linux/mm_inline.h:10:
include/linux/userfaultfd_k.h:199:25: warning: shift count >= width of type [-Wshift-count-overflow]
199 | return vma->vm_flags & VM_UFFD_RWP;
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
In file included from fs/userfaultfd.c:18:
In file included from include/linux/mm_inline.h:10:
include/linux/userfaultfd_k.h:216:25: warning: shift count >= width of type [-Wshift-count-overflow]
216 | return vma->vm_flags & __VM_UFFD_FLAGS;
| ^~~~~~~~~~~~~~~
include/linux/userfaultfd_k.h:25:5: note: expanded from macro '__VM_UFFD_FLAGS'
25 | VM_UFFD_RWP)
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
In file included from fs/userfaultfd.c:18:
In file included from include/linux/mm_inline.h:10:
include/linux/userfaultfd_k.h:223:14: warning: shift count >= width of type [-Wshift-count-overflow]
223 | vm_flags &= __VM_UFFD_FLAGS;
| ^~~~~~~~~~~~~~~
include/linux/userfaultfd_k.h:25:5: note: expanded from macro '__VM_UFFD_FLAGS'
25 | VM_UFFD_RWP)
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
In file included from fs/userfaultfd.c:18:
In file included from include/linux/mm_inline.h:10:
include/linux/userfaultfd_k.h:237:15: warning: shift count >= width of type [-Wshift-count-overflow]
237 | vm_flags &= ~VM_UFFD_RWP;
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
>> fs/userfaultfd.c:220:15: warning: shift count >= width of type [-Wshift-count-overflow]
220 | if (reason & VM_UFFD_RWP)
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
fs/userfaultfd.c:328:39: warning: shift count >= width of type [-Wshift-count-overflow]
328 | if (pmd_protnone(_pmd) && (reason & VM_UFFD_RWP))
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
fs/userfaultfd.c:357:39: warning: shift count >= width of type [-Wshift-count-overflow]
357 | if (pte_protnone(ptent) && (reason & VM_UFFD_RWP))
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
fs/userfaultfd.c:418:28: warning: shift count >= width of type [-Wshift-count-overflow]
418 | VM_WARN_ON_ONCE(reason & ~__VM_UFFD_FLAGS);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
include/linux/userfaultfd_k.h:25:5: note: expanded from macro '__VM_UFFD_FLAGS'
25 | VM_UFFD_RWP)
| ^
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^
note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/mmdebug.h:123:50: note: expanded from macro 'VM_WARN_ON_ONCE'
123 | #define VM_WARN_ON_ONCE(cond) (void)WARN_ON_ONCE(cond)
| ~~~~~~~~~~~~~^~~~~
include/asm-generic/bug.h:180:18: note: expanded from macro 'WARN_ON_ONCE'
180 | DO_ONCE_LITE_IF(condition, WARN_ON, 1)
| ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
include/linux/once_lite.h:28:27: note: expanded from macro 'DO_ONCE_LITE_IF'
28 | bool __ret_do_once = !!(condition); \
| ^~~~~~~~~
fs/userfaultfd.c:1317:15: warning: shift count >= width of type [-Wshift-count-overflow]
1317 | vm_flags |= VM_UFFD_RWP;
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
fs/userfaultfd.c:1360:24: warning: shift count >= width of type [-Wshift-count-overflow]
1359 | VM_WARN_ON_ONCE(!!cur->vm_userfaultfd_ctx.ctx ^
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1360 | !!(cur->vm_flags & __VM_UFFD_FLAGS));
| ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
include/linux/userfaultfd_k.h:25:5: note: expanded from macro '__VM_UFFD_FLAGS'
25 | VM_UFFD_RWP)
| ^
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^
note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/mmdebug.h:123:50: note: expanded from macro 'VM_WARN_ON_ONCE'
123 | #define VM_WARN_ON_ONCE(cond) (void)WARN_ON_ONCE(cond)
| ~~~~~~~~~~~~~^~~~~
include/asm-generic/bug.h:180:18: note: expanded from macro 'WARN_ON_ONCE'
180 | DO_ONCE_LITE_IF(condition, WARN_ON, 1)
| ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
include/linux/once_lite.h:28:27: note: expanded from macro 'DO_ONCE_LITE_IF'
28 | bool __ret_do_once = !!(condition); \
| ^~~~~~~~~
fs/userfaultfd.c:1511:24: warning: shift count >= width of type [-Wshift-count-overflow]
1510 | VM_WARN_ON_ONCE(!!cur->vm_userfaultfd_ctx.ctx ^
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1511 | !!(cur->vm_flags & __VM_UFFD_FLAGS));
| ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
include/linux/userfaultfd_k.h:25:5: note: expanded from macro '__VM_UFFD_FLAGS'
25 | VM_UFFD_RWP)
--
In file included from mm/memory.c:44:
In file included from include/linux/mm_inline.h:10:
>> include/linux/userfaultfd_k.h:167:55: warning: shift count >= width of type [-Wshift-count-overflow]
167 | return vma->vm_flags & (VM_UFFD_WP | VM_UFFD_MINOR | VM_UFFD_RWP);
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
In file included from mm/memory.c:44:
In file included from include/linux/mm_inline.h:10:
include/linux/userfaultfd_k.h:199:25: warning: shift count >= width of type [-Wshift-count-overflow]
199 | return vma->vm_flags & VM_UFFD_RWP;
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
In file included from mm/memory.c:44:
In file included from include/linux/mm_inline.h:10:
include/linux/userfaultfd_k.h:216:25: warning: shift count >= width of type [-Wshift-count-overflow]
216 | return vma->vm_flags & __VM_UFFD_FLAGS;
| ^~~~~~~~~~~~~~~
include/linux/userfaultfd_k.h:25:5: note: expanded from macro '__VM_UFFD_FLAGS'
25 | VM_UFFD_RWP)
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
In file included from mm/memory.c:44:
In file included from include/linux/mm_inline.h:10:
include/linux/userfaultfd_k.h:223:14: warning: shift count >= width of type [-Wshift-count-overflow]
223 | vm_flags &= __VM_UFFD_FLAGS;
| ^~~~~~~~~~~~~~~
include/linux/userfaultfd_k.h:25:5: note: expanded from macro '__VM_UFFD_FLAGS'
25 | VM_UFFD_RWP)
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
In file included from mm/memory.c:44:
In file included from include/linux/mm_inline.h:10:
include/linux/userfaultfd_k.h:237:15: warning: shift count >= width of type [-Wshift-count-overflow]
237 | vm_flags &= ~VM_UFFD_RWP;
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
mm/memory.c:1485:26: warning: shift count >= width of type [-Wshift-count-overflow]
1485 | if (dst_vma->vm_flags & VM_COPY_ON_FORK)
| ^~~~~~~~~~~~~~~
include/linux/mm.h:643:65: note: expanded from macro 'VM_COPY_ON_FORK'
643 | #define VM_COPY_ON_FORK (VM_PFNMAP | VM_MIXEDMAP | VM_UFFD_WP | VM_UFFD_RWP | \
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
mm/memory.c:6069:31: warning: shift count >= width of type [-Wshift-count-overflow]
6069 | return handle_userfault(vmf, VM_UFFD_RWP);
| ^~~~~~~~~~~
include/linux/mm.h:501:21: note: expanded from macro 'VM_UFFD_RWP'
501 | #define VM_UFFD_RWP INIT_VM_FLAG(UFFD_RWP)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/mm.h:402:28: note: expanded from macro 'INIT_VM_FLAG'
402 | #define INIT_VM_FLAG(name) BIT((__force int) VMA_ ## name ## _BIT)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/vdso/bits.h:7:26: note: expanded from macro 'BIT'
7 | #define BIT(nr) (UL(1) << (nr))
| ^ ~~~~
..
vim +167 include/linux/userfaultfd_k.h
153
154 /*
155 * Never enable huge pmd sharing on some uffd registered vmas:
156 *
157 * - VM_UFFD_WP VMAs, because write protect information is per pgtable entry.
158 *
159 * - VM_UFFD_MINOR VMAs, because otherwise we would never get minor faults for
160 * VMAs which share huge pmds. (If you have two mappings to the same
161 * underlying pages, and fault in the non-UFFD-registered one with a write,
162 * with huge pmd sharing this would *also* setup the second UFFD-registered
163 * mapping, and we'd not get minor faults.)
164 */
165 static inline bool uffd_disable_huge_pmd_share(struct vm_area_struct *vma)
166 {
> 167 return vma->vm_flags & (VM_UFFD_WP | VM_UFFD_MINOR | VM_UFFD_RWP);
168 }
169
--
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https://github.com/intel/lkp-tests/wiki
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