CVS commit: src/sys/external/bsd/common/include/linux

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Sat Nov  7 10:08:16 UTC 2026

Modified Files:
        src/sys/external/bsd/common/include/linux: rcupdate.h

Log Message:
drm: Fix rcu_replace_pointer.

This Linux API macro takes an _lvalue_ expression for an object, not
a pointer to the object -- unlike, e.g., the atomic_load/store
functions.  So we can't copy its value into a local variable (to
avoid duplicate macro argument expansion) and then assign the local
variable with rcu_assign_pointer because that will only modify the
local copy, not the caller's lvalue!

Rename the macro parameters to make this clearer so it doesn't trip
me up again next time I read this.

Probably fixes dozens of graphics problems on a generation of Intel
hardware.  Derp!

PR kern/60980: rcu_replace_pointer() fails to update the original pointer


To generate a diff of this commit:
cvs rdiff -u -r1.8 -r1.9 src/sys/external/bsd/common/include/linux/rcupdate.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.