tree: git://people.freedesktop.org/~agd5f/linux.git drm-next-4.20-wip
head: bdb1922abd620d24715906bac4d119274d98f4c9
commit: 46659a83e4662ed92000ec13445b8c0ca96fd2cc [224/235] drm/amd/display: Support reading hw state from debugfs file
reproduce:
# apt-get install sparse
git checkout 46659a83e4662ed92000ec13445b8c0ca96fd2cc
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__
sparse warnings: (new ones prefixed by >>)
include/linux/slab.h:631:13: sparse: undefined identifier '__builtin_mul_overflow'
include/linux/slab.h:631:13: sparse: not a function <noident>
include/linux/slab.h:631:13: sparse: not a function <noident>
include/linux/slab.h:631:13: sparse: not a function <noident>
include/linux/slab.h:631:13: sparse: not a function <noident>
>> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_debugfs.c:735:46: sparse: Using plain integer as NULL pointer
>> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_debugfs.c:749:27: sparse: expression using sizeof(void)
>> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_debugfs.c:749:27: sparse: expression using sizeof(void)
include/linux/slab.h:631:13: sparse: call with no type!
vim +735 drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_debugfs.c
722
723 /*
724 * Writes DTN log state to the user supplied buffer.
725 * Example usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log
726 */
727 static ssize_t dtn_log_read(
728 struct file *f,
729 char __user *buf,
730 size_t size,
731 loff_t *pos)
732 {
733 struct amdgpu_device *adev = file_inode(f)->i_private;
734 struct dc *dc = adev->dm.dc;
> 735 struct dc_log_buffer_ctx log_ctx = { 0 };
736 ssize_t result = 0;
737
738 if (!buf || !size)
739 return -EINVAL;
740
741 if (!dc->hwss.log_hw_state)
742 return 0;
743
744 dc->hwss.log_hw_state(dc, &log_ctx);
745
746 if (*pos < log_ctx.pos) {
747 size_t to_copy = log_ctx.pos - *pos;
748
> 749 to_copy = min(to_copy, size);
750
751 if (!copy_to_user(buf, log_ctx.buf + *pos, to_copy)) {
752 *pos += to_copy;
753 result = to_copy;
754 }
755 }
756
757 kfree(log_ctx.buf);
758
759 return result;
760 }
761
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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