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Michael Bommarito dc058600e7 um: drivers: call kernel_strrchr() explicitly in cow_user.c

commit 91e901c65b upstream.

Building ARCH=um on glibc >= 2.43 fails:

  arch/um/drivers/cow_user.c: error: implicit declaration of
  function 'strrchr' [-Wimplicit-function-declaration]

glibc 2.43's C23 const-preserving strrchr() macro does not survive
UML's global -Dstrrchr=kernel_strrchr remap from arch/um/Makefile.
Call kernel_strrchr() directly in cow_user.c so the source no longer
depends on the -D rewrite.

Fixes: 2c51a4bc02 ("um: fix strrchr() problems")
Suggested-by: Johannes Berg <johannes@sipsolutions.net>
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-4-6
Assisted-by: Codex:gpt-5-4
Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
Link: https://patch.msgid.link/20260408070102.2325572-1-michael.bommarito@gmail.com
[remove unnecessary 'extern']
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2026-05-07 06:09:26 +02:00

configs

…

drivers

um: drivers: call kernel_strrchr() explicitly in cow_user.c

2026-05-07 06:09:26 +02:00

include

um: Re-evaluate thread flags repeatedly

2025-08-20 18:30:32 +02:00

kernel

arch: Add the macro COMPILE_OFFSETS to all the asm-offsets.c

2025-11-02 22:15:22 +09:00