* drivers/gpu/drm/drm_gpusvm.c:933 drm_gpusvm_range_chunk_size() error: uninitialized symbol 'end'.
@ 2026-01-10 6:57 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-01-10 6:57 UTC (permalink / raw)
To: oe-kbuild; +Cc: lkp, Dan Carpenter
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Alistair Popple <apopple@nvidia.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Linux Memory Management List <linux-mm@kvack.org>
CC: "Björn Töpel" <bjorn@rivosinc.com>
CC: Jason Gunthorpe <jgg@nvidia.com>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: cb2076b0910f3b19036ec7d50530113fcb9736c8
commit: d438d273417055241ebaaf1ba3be23459fc27cba mm: remove devmap related functions and page table bits
date: 6 months ago
:::::: branch date: 5 hours ago
:::::: commit date: 6 months ago
config: s390-randconfig-r072-20260109 (https://download.01.org/0day-ci/archive/20260110/202601101402.IFPyfaRc-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9b8addffa70cee5b2acc5454712d9cf78ce45710)
smatch version: v0.5.0-8985-g2614ff1a
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>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202601101402.IFPyfaRc-lkp@intel.com/
New smatch warnings:
drivers/gpu/drm/drm_gpusvm.c:933 drm_gpusvm_range_chunk_size() error: uninitialized symbol 'end'.
drivers/gpu/drm/drm_gpusvm.c:933 drm_gpusvm_range_chunk_size() error: uninitialized symbol 'start'.
Old smatch warnings:
drivers/gpu/drm/drm_gpusvm.c:1427 drm_gpusvm_range_get_pages() error: uninitialized symbol 'pagemap'.
drivers/gpu/drm/drm_gpusvm.c:1446 drm_gpusvm_range_get_pages() error: uninitialized symbol 'dpagemap'.
vim +/end +933 drivers/gpu/drm/drm_gpusvm.c
99624bdff86707 Matthew Brost 2025-03-05 885
99624bdff86707 Matthew Brost 2025-03-05 886 /**
99624bdff86707 Matthew Brost 2025-03-05 887 * drm_gpusvm_range_chunk_size() - Determine chunk size for GPU SVM range
99624bdff86707 Matthew Brost 2025-03-05 888 * @gpusvm: Pointer to the GPU SVM structure
99624bdff86707 Matthew Brost 2025-03-05 889 * @notifier: Pointer to the GPU SVM notifier structure
99624bdff86707 Matthew Brost 2025-03-05 890 * @vas: Pointer to the virtual memory area structure
99624bdff86707 Matthew Brost 2025-03-05 891 * @fault_addr: Fault address
99624bdff86707 Matthew Brost 2025-03-05 892 * @gpuva_start: Start address of GPUVA which mirrors CPU
99624bdff86707 Matthew Brost 2025-03-05 893 * @gpuva_end: End address of GPUVA which mirrors CPU
99624bdff86707 Matthew Brost 2025-03-05 894 * @check_pages_threshold: Check CPU pages for present threshold
99624bdff86707 Matthew Brost 2025-03-05 895 *
99624bdff86707 Matthew Brost 2025-03-05 896 * This function determines the chunk size for the GPU SVM range based on the
99624bdff86707 Matthew Brost 2025-03-05 897 * fault address, GPU SVM chunk sizes, existing GPU SVM ranges, and the virtual
99624bdff86707 Matthew Brost 2025-03-05 898 * memory area boundaries.
99624bdff86707 Matthew Brost 2025-03-05 899 *
99624bdff86707 Matthew Brost 2025-03-05 900 * Return: Chunk size on success, LONG_MAX on failure.
99624bdff86707 Matthew Brost 2025-03-05 901 */
99624bdff86707 Matthew Brost 2025-03-05 902 static unsigned long
99624bdff86707 Matthew Brost 2025-03-05 903 drm_gpusvm_range_chunk_size(struct drm_gpusvm *gpusvm,
99624bdff86707 Matthew Brost 2025-03-05 904 struct drm_gpusvm_notifier *notifier,
99624bdff86707 Matthew Brost 2025-03-05 905 struct vm_area_struct *vas,
99624bdff86707 Matthew Brost 2025-03-05 906 unsigned long fault_addr,
99624bdff86707 Matthew Brost 2025-03-05 907 unsigned long gpuva_start,
99624bdff86707 Matthew Brost 2025-03-05 908 unsigned long gpuva_end,
99624bdff86707 Matthew Brost 2025-03-05 909 unsigned long check_pages_threshold)
99624bdff86707 Matthew Brost 2025-03-05 910 {
99624bdff86707 Matthew Brost 2025-03-05 911 unsigned long start, end;
99624bdff86707 Matthew Brost 2025-03-05 912 int i = 0;
99624bdff86707 Matthew Brost 2025-03-05 913
99624bdff86707 Matthew Brost 2025-03-05 914 retry:
99624bdff86707 Matthew Brost 2025-03-05 915 for (; i < gpusvm->num_chunks; ++i) {
99624bdff86707 Matthew Brost 2025-03-05 916 start = ALIGN_DOWN(fault_addr, gpusvm->chunk_sizes[i]);
99624bdff86707 Matthew Brost 2025-03-05 917 end = ALIGN(fault_addr + 1, gpusvm->chunk_sizes[i]);
99624bdff86707 Matthew Brost 2025-03-05 918
99624bdff86707 Matthew Brost 2025-03-05 919 if (start >= vas->vm_start && end <= vas->vm_end &&
99624bdff86707 Matthew Brost 2025-03-05 920 start >= drm_gpusvm_notifier_start(notifier) &&
99624bdff86707 Matthew Brost 2025-03-05 921 end <= drm_gpusvm_notifier_end(notifier) &&
99624bdff86707 Matthew Brost 2025-03-05 922 start >= gpuva_start && end <= gpuva_end)
99624bdff86707 Matthew Brost 2025-03-05 923 break;
99624bdff86707 Matthew Brost 2025-03-05 924 }
99624bdff86707 Matthew Brost 2025-03-05 925
99624bdff86707 Matthew Brost 2025-03-05 926 if (i == gpusvm->num_chunks)
99624bdff86707 Matthew Brost 2025-03-05 927 return LONG_MAX;
99624bdff86707 Matthew Brost 2025-03-05 928
99624bdff86707 Matthew Brost 2025-03-05 929 /*
99624bdff86707 Matthew Brost 2025-03-05 930 * If allocation more than page, ensure not to overlap with existing
99624bdff86707 Matthew Brost 2025-03-05 931 * ranges.
99624bdff86707 Matthew Brost 2025-03-05 932 */
99624bdff86707 Matthew Brost 2025-03-05 @933 if (end - start != SZ_4K) {
99624bdff86707 Matthew Brost 2025-03-05 934 struct drm_gpusvm_range *range;
99624bdff86707 Matthew Brost 2025-03-05 935
99624bdff86707 Matthew Brost 2025-03-05 936 range = drm_gpusvm_range_find(notifier, start, end);
99624bdff86707 Matthew Brost 2025-03-05 937 if (range) {
99624bdff86707 Matthew Brost 2025-03-05 938 ++i;
99624bdff86707 Matthew Brost 2025-03-05 939 goto retry;
99624bdff86707 Matthew Brost 2025-03-05 940 }
99624bdff86707 Matthew Brost 2025-03-05 941
99624bdff86707 Matthew Brost 2025-03-05 942 /*
99624bdff86707 Matthew Brost 2025-03-05 943 * XXX: Only create range on pages CPU has faulted in. Without
99624bdff86707 Matthew Brost 2025-03-05 944 * this check, or prefault, on BMG 'xe_exec_system_allocator --r
99624bdff86707 Matthew Brost 2025-03-05 945 * process-many-malloc' fails. In the failure case, each process
99624bdff86707 Matthew Brost 2025-03-05 946 * mallocs 16k but the CPU VMA is ~128k which results in 64k SVM
99624bdff86707 Matthew Brost 2025-03-05 947 * ranges. When migrating the SVM ranges, some processes fail in
99624bdff86707 Matthew Brost 2025-03-05 948 * drm_gpusvm_migrate_to_devmem with 'migrate.cpages != npages'
99624bdff86707 Matthew Brost 2025-03-05 949 * and then upon drm_gpusvm_range_get_pages device pages from
99624bdff86707 Matthew Brost 2025-03-05 950 * other processes are collected + faulted in which creates all
99624bdff86707 Matthew Brost 2025-03-05 951 * sorts of problems. Unsure exactly how this happening, also
99624bdff86707 Matthew Brost 2025-03-05 952 * problem goes away if 'xe_exec_system_allocator --r
99624bdff86707 Matthew Brost 2025-03-05 953 * process-many-malloc' mallocs at least 64k at a time.
99624bdff86707 Matthew Brost 2025-03-05 954 */
99624bdff86707 Matthew Brost 2025-03-05 955 if (end - start <= check_pages_threshold &&
99624bdff86707 Matthew Brost 2025-03-05 956 !drm_gpusvm_check_pages(gpusvm, notifier, start, end)) {
99624bdff86707 Matthew Brost 2025-03-05 957 ++i;
99624bdff86707 Matthew Brost 2025-03-05 958 goto retry;
99624bdff86707 Matthew Brost 2025-03-05 959 }
99624bdff86707 Matthew Brost 2025-03-05 960 }
99624bdff86707 Matthew Brost 2025-03-05 961
99624bdff86707 Matthew Brost 2025-03-05 962 return end - start;
99624bdff86707 Matthew Brost 2025-03-05 963 }
99624bdff86707 Matthew Brost 2025-03-05 964
:::::: The code at line 933 was first introduced by commit
:::::: 99624bdff8670795b678eafa6509aaad3a5c0175 drm/gpusvm: Add support for GPU Shared Virtual Memory
:::::: TO: Matthew Brost <matthew.brost@intel.com>
:::::: CC: Matthew Brost <matthew.brost@intel.com>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
* drivers/gpu/drm/drm_gpusvm.c:933 drm_gpusvm_range_chunk_size() error: uninitialized symbol 'end'.
@ 2026-01-10 20:13 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-01-10 20:13 UTC (permalink / raw)
To: oe-kbuild; +Cc: lkp, Dan Carpenter
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Alistair Popple <apopple@nvidia.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Linux Memory Management List <linux-mm@kvack.org>
CC: "Björn Töpel" <bjorn@rivosinc.com>
CC: Jason Gunthorpe <jgg@nvidia.com>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 97313d6113ab4362ad15076f65560e65288fbcb8
commit: d438d273417055241ebaaf1ba3be23459fc27cba mm: remove devmap related functions and page table bits
date: 6 months ago
:::::: branch date: 3 hours ago
:::::: commit date: 6 months ago
config: s390-randconfig-r072-20260109 (https://download.01.org/0day-ci/archive/20260111/202601110432.5RH1Bfes-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9b8addffa70cee5b2acc5454712d9cf78ce45710)
smatch version: v0.5.0-8985-g2614ff1a
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>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202601110432.5RH1Bfes-lkp@intel.com/
New smatch warnings:
drivers/gpu/drm/drm_gpusvm.c:933 drm_gpusvm_range_chunk_size() error: uninitialized symbol 'end'.
drivers/gpu/drm/drm_gpusvm.c:933 drm_gpusvm_range_chunk_size() error: uninitialized symbol 'start'.
Old smatch warnings:
drivers/gpu/drm/drm_gpusvm.c:1427 drm_gpusvm_range_get_pages() error: uninitialized symbol 'pagemap'.
drivers/gpu/drm/drm_gpusvm.c:1446 drm_gpusvm_range_get_pages() error: uninitialized symbol 'dpagemap'.
vim +/end +933 drivers/gpu/drm/drm_gpusvm.c
99624bdff86707 Matthew Brost 2025-03-05 885
99624bdff86707 Matthew Brost 2025-03-05 886 /**
99624bdff86707 Matthew Brost 2025-03-05 887 * drm_gpusvm_range_chunk_size() - Determine chunk size for GPU SVM range
99624bdff86707 Matthew Brost 2025-03-05 888 * @gpusvm: Pointer to the GPU SVM structure
99624bdff86707 Matthew Brost 2025-03-05 889 * @notifier: Pointer to the GPU SVM notifier structure
99624bdff86707 Matthew Brost 2025-03-05 890 * @vas: Pointer to the virtual memory area structure
99624bdff86707 Matthew Brost 2025-03-05 891 * @fault_addr: Fault address
99624bdff86707 Matthew Brost 2025-03-05 892 * @gpuva_start: Start address of GPUVA which mirrors CPU
99624bdff86707 Matthew Brost 2025-03-05 893 * @gpuva_end: End address of GPUVA which mirrors CPU
99624bdff86707 Matthew Brost 2025-03-05 894 * @check_pages_threshold: Check CPU pages for present threshold
99624bdff86707 Matthew Brost 2025-03-05 895 *
99624bdff86707 Matthew Brost 2025-03-05 896 * This function determines the chunk size for the GPU SVM range based on the
99624bdff86707 Matthew Brost 2025-03-05 897 * fault address, GPU SVM chunk sizes, existing GPU SVM ranges, and the virtual
99624bdff86707 Matthew Brost 2025-03-05 898 * memory area boundaries.
99624bdff86707 Matthew Brost 2025-03-05 899 *
99624bdff86707 Matthew Brost 2025-03-05 900 * Return: Chunk size on success, LONG_MAX on failure.
99624bdff86707 Matthew Brost 2025-03-05 901 */
99624bdff86707 Matthew Brost 2025-03-05 902 static unsigned long
99624bdff86707 Matthew Brost 2025-03-05 903 drm_gpusvm_range_chunk_size(struct drm_gpusvm *gpusvm,
99624bdff86707 Matthew Brost 2025-03-05 904 struct drm_gpusvm_notifier *notifier,
99624bdff86707 Matthew Brost 2025-03-05 905 struct vm_area_struct *vas,
99624bdff86707 Matthew Brost 2025-03-05 906 unsigned long fault_addr,
99624bdff86707 Matthew Brost 2025-03-05 907 unsigned long gpuva_start,
99624bdff86707 Matthew Brost 2025-03-05 908 unsigned long gpuva_end,
99624bdff86707 Matthew Brost 2025-03-05 909 unsigned long check_pages_threshold)
99624bdff86707 Matthew Brost 2025-03-05 910 {
99624bdff86707 Matthew Brost 2025-03-05 911 unsigned long start, end;
99624bdff86707 Matthew Brost 2025-03-05 912 int i = 0;
99624bdff86707 Matthew Brost 2025-03-05 913
99624bdff86707 Matthew Brost 2025-03-05 914 retry:
99624bdff86707 Matthew Brost 2025-03-05 915 for (; i < gpusvm->num_chunks; ++i) {
99624bdff86707 Matthew Brost 2025-03-05 916 start = ALIGN_DOWN(fault_addr, gpusvm->chunk_sizes[i]);
99624bdff86707 Matthew Brost 2025-03-05 917 end = ALIGN(fault_addr + 1, gpusvm->chunk_sizes[i]);
99624bdff86707 Matthew Brost 2025-03-05 918
99624bdff86707 Matthew Brost 2025-03-05 919 if (start >= vas->vm_start && end <= vas->vm_end &&
99624bdff86707 Matthew Brost 2025-03-05 920 start >= drm_gpusvm_notifier_start(notifier) &&
99624bdff86707 Matthew Brost 2025-03-05 921 end <= drm_gpusvm_notifier_end(notifier) &&
99624bdff86707 Matthew Brost 2025-03-05 922 start >= gpuva_start && end <= gpuva_end)
99624bdff86707 Matthew Brost 2025-03-05 923 break;
99624bdff86707 Matthew Brost 2025-03-05 924 }
99624bdff86707 Matthew Brost 2025-03-05 925
99624bdff86707 Matthew Brost 2025-03-05 926 if (i == gpusvm->num_chunks)
99624bdff86707 Matthew Brost 2025-03-05 927 return LONG_MAX;
99624bdff86707 Matthew Brost 2025-03-05 928
99624bdff86707 Matthew Brost 2025-03-05 929 /*
99624bdff86707 Matthew Brost 2025-03-05 930 * If allocation more than page, ensure not to overlap with existing
99624bdff86707 Matthew Brost 2025-03-05 931 * ranges.
99624bdff86707 Matthew Brost 2025-03-05 932 */
99624bdff86707 Matthew Brost 2025-03-05 @933 if (end - start != SZ_4K) {
99624bdff86707 Matthew Brost 2025-03-05 934 struct drm_gpusvm_range *range;
99624bdff86707 Matthew Brost 2025-03-05 935
99624bdff86707 Matthew Brost 2025-03-05 936 range = drm_gpusvm_range_find(notifier, start, end);
99624bdff86707 Matthew Brost 2025-03-05 937 if (range) {
99624bdff86707 Matthew Brost 2025-03-05 938 ++i;
99624bdff86707 Matthew Brost 2025-03-05 939 goto retry;
99624bdff86707 Matthew Brost 2025-03-05 940 }
99624bdff86707 Matthew Brost 2025-03-05 941
99624bdff86707 Matthew Brost 2025-03-05 942 /*
99624bdff86707 Matthew Brost 2025-03-05 943 * XXX: Only create range on pages CPU has faulted in. Without
99624bdff86707 Matthew Brost 2025-03-05 944 * this check, or prefault, on BMG 'xe_exec_system_allocator --r
99624bdff86707 Matthew Brost 2025-03-05 945 * process-many-malloc' fails. In the failure case, each process
99624bdff86707 Matthew Brost 2025-03-05 946 * mallocs 16k but the CPU VMA is ~128k which results in 64k SVM
99624bdff86707 Matthew Brost 2025-03-05 947 * ranges. When migrating the SVM ranges, some processes fail in
99624bdff86707 Matthew Brost 2025-03-05 948 * drm_gpusvm_migrate_to_devmem with 'migrate.cpages != npages'
99624bdff86707 Matthew Brost 2025-03-05 949 * and then upon drm_gpusvm_range_get_pages device pages from
99624bdff86707 Matthew Brost 2025-03-05 950 * other processes are collected + faulted in which creates all
99624bdff86707 Matthew Brost 2025-03-05 951 * sorts of problems. Unsure exactly how this happening, also
99624bdff86707 Matthew Brost 2025-03-05 952 * problem goes away if 'xe_exec_system_allocator --r
99624bdff86707 Matthew Brost 2025-03-05 953 * process-many-malloc' mallocs at least 64k at a time.
99624bdff86707 Matthew Brost 2025-03-05 954 */
99624bdff86707 Matthew Brost 2025-03-05 955 if (end - start <= check_pages_threshold &&
99624bdff86707 Matthew Brost 2025-03-05 956 !drm_gpusvm_check_pages(gpusvm, notifier, start, end)) {
99624bdff86707 Matthew Brost 2025-03-05 957 ++i;
99624bdff86707 Matthew Brost 2025-03-05 958 goto retry;
99624bdff86707 Matthew Brost 2025-03-05 959 }
99624bdff86707 Matthew Brost 2025-03-05 960 }
99624bdff86707 Matthew Brost 2025-03-05 961
99624bdff86707 Matthew Brost 2025-03-05 962 return end - start;
99624bdff86707 Matthew Brost 2025-03-05 963 }
99624bdff86707 Matthew Brost 2025-03-05 964
:::::: The code at line 933 was first introduced by commit
:::::: 99624bdff8670795b678eafa6509aaad3a5c0175 drm/gpusvm: Add support for GPU Shared Virtual Memory
:::::: TO: Matthew Brost <matthew.brost@intel.com>
:::::: CC: Matthew Brost <matthew.brost@intel.com>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2026-01-10 20:14 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
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2026-01-10 20:13 kernel test robot
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