drm/i915/gem: Comment on inability to check args.pad for MMAP_OFFSET

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Since we didn't check and insist that args.pad must be zero for MMAP_GTT
historically, we cannot insert a check now as old userspace may be
feeding in garbage. As such the lack of check is enshrined into the ABI,
so add a comment to remind us we cannot add the check later.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191207222644.2830129-1-chris@chris-wilson.co.uk

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Chris Wilson 2019-12-07 22:26:44 +00:00

parent d634110007

commit 8d65859a4c

1 changed files with 9 additions and 0 deletions

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drivers/gpu/drm/i915/gem/i915_gem_mman.c

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