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drm/xe: circumvent bogus stringop-overflow warning

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gcc-13 warns about an array overflow that it sees but that is
prevented by the "asid % NUM_PF_QUEUE" calculation:

drivers/gpu/drm/xe/xe_gt_pagefault.c: In function 'xe_guc_pagefault_handler':
include/linux/fortify-string.h:57:33: error: writing 16 bytes into a region of size 0 [-Werror=stringop-overflow=]
include/linux/fortify-string.h:689:26: note: in expansion of macro '__fortify_memcpy_chk'
  689 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s,                  \
      |                          ^~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/xe/xe_gt_pagefault.c:341:17: note: in expansion of macro 'memcpy'
  341 |                 memcpy(pf_queue->data + pf_queue->tail, msg, len * sizeof(u32));
      |                 ^~~~~~
drivers/gpu/drm/xe/xe_gt_types.h:102:25: note: at offset [1144, 265324] into destination object 'tile' of size 8

I found that rewriting the assignment using pointer addition rather than the
equivalent array index calculation prevents the warning, so use that instead.

I sent a bug report against gcc for the false positive warning.

Fixes: dd08ebf6c3 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113214
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240103114819.2913937-1-arnd@kernel.org
This commit is contained in:
Arnd Bergmann 2024-01-03 12:48:02 +01:00 committed by Lucas De Marchi
parent 447f74d223
commit 774ef5dfc9
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/xe/xe_gt_pagefault.c
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@ -340,7 +340,7 @@ int xe_guc_pagefault_handler(struct xe_guc *guc, u32 *msg, u32 len)
return -EPROTO;
asid = FIELD_GET(PFD_ASID, msg[1]);
pf_queue = &gt->usm.pf_queue[asid % NUM_PF_QUEUE];
pf_queue = gt->usm.pf_queue + (asid % NUM_PF_QUEUE);
spin_lock_irqsave(&pf_queue->lock, flags);
full = pf_queue_full(pf_queue);