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Differential D56442

linuxkpi: Add `mem_is_zero()`
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Authored by dumbbell on Apr 16 2026, 9:00 PM.
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rGab77c26d3643: linuxkpi: Add `mem_is_zero()`
Summary

The DRM generic code and the i915 DRM driver started to replace the use of memchr_inv() by a mem_is_zero() in Linux 6.12. We reuse the previous use of memchr_inv() to implement mem_is_zero().

This is part of the update of DRM drivers to Linux 6.12.

Sponsored by: The FreeBSD Foundation

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rG FreeBSD src repository
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Event Timeline

dumbbell created this revision.Apr 16 2026, 9:00 PM
Herald added subscribers: emaste, imp. · View Herald TranscriptApr 16 2026, 9:00 PM
dumbbell requested review of this revision.Apr 16 2026, 9:00 PM
dumbbell added a parent revision: D56441: linuxkpi: Move {lower,upper}_32_bits macros to <linux/wordpart.h>.Apr 16 2026, 9:28 PM
dumbbell added a child revision: D56443: sx: Add `sx_has_waiters()` macro.
bz requested changes to this revision.Apr 20 2026, 10:17 PM
bz added a subscriber: bz.
bz added inline comments.
sys/compat/linuxkpi/common/include/linux/string.h
206

This could be written as
return (!memchr_inv(start, 0, length));
but as per style probably should be
return (memchr_inv(start, 0, length) == NULL);

This revision now requires changes to proceed.Apr 20 2026, 10:17 PM
dumbbell updated this revision to Diff 176059.EditedApr 22 2026, 7:56 AM

Address comment from @bz

Sorry, that’s me who dislike putting calls or complex statements directly in the return :-) I should have followed the adopted style.

bz accepted this revision.Apr 22 2026, 1:39 PM
This revision is now accepted and ready to land.Apr 22 2026, 1:39 PM
Closed by commit rGab77c26d3643: linuxkpi: Add `mem_is_zero()` (authored by dumbbell). · Explain WhyApr 22 2026, 6:10 PM
This revision was automatically updated to reflect the committed changes.
dumbbell added a commit: rGab77c26d3643: linuxkpi: Add `mem_is_zero()`.

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sys/
compat/
linuxkpi/
common/
include/
linux/
6 lines

Diff 176132

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sys/compat/linuxkpi/common/include/linux/string.h

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