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Differential D37699

LinuxKPI: linux/seqlock.h: Fix write_seqcount_(begin|end)
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Authored by wulf on Dec 14 2022, 3:24 PM.
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rG68f08e26e279: LinuxKPI: linux/seqlock.h: Fix write_seqcount_(begin|end)
Summary

linux/seqlock.h: Fix write_seqcount_(begin|end)
in seqcount_mutex_t case with removal of extraneous mutex lock/unlock
calls and addition of missing critical section.

While here strip one inline wrap layer to reduce code size.

Fixes startup lockup of i915kms in drm-kmod v5.12

Test Plan

Build drm-kmod v5.12 and kldload i915kms after than

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rG FreeBSD src repository
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sys/
compat/
linuxkpi/
common/
include/
linux/
94 lines

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

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