diff options
| author | Thomas Weißschuh <thomas.weissschuh@linutronix.de> | 2026-03-16 10:36:00 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2026-03-16 10:36:00 +0800 |
| commit | c8b8f3c50f487b145433a6c3f95efd8790079a06 (patch) | |
| tree | 4024dc2ce45d5bc54172744fe25e4f4e2347d700 /include/uapi/linux/wimax/git@git.tavy.me:linux.git | |
| parent | f338e77383789c0cae23ca3d48adcc5e9e137e3c (diff) | |
LoongArch: Only use SC.Q when supported by the assembler
The 128-bit atomic cmpxchg implementation uses the SC.Q instruction.
Older versions of GNU AS do not support that instruction, erroring out:
ERROR:root:{standard input}: Assembler messages:
{standard input}:4831: Error: no match insn: sc.q $t0,$t1,$r14
{standard input}:6407: Error: no match insn: sc.q $t0,$t1,$r23
{standard input}:10856: Error: no match insn: sc.q $t0,$t1,$r14
make[4]: *** [../scripts/Makefile.build:289: mm/slub.o] Error 1
(Binutils 2.41)
So test support for SC.Q in Kconfig and disable the atomics if the
instruction is not available.
Fixes: f0e4b1b6e295 ("LoongArch: Add 128-bit atomic cmpxchg support")
Closes: https://lore.kernel.org/lkml/20260216082834-edc51c46-7b7a-4295-8ea5-4d9a3ca2224f@linutronix.de/
Reviewed-by: Xi Ruoyao <xry111@xry111.site>
Acked-by: Hengqi Chen <hengqi.chen@gmail.com>
Tested-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'include/uapi/linux/wimax/git@git.tavy.me:linux.git')
0 files changed, 0 insertions, 0 deletions