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