From: Radim Krčmář Date: Fri, 25 Jul 2025 16:54:10 +0000 (+0200) Subject: riscv: use lw when reading int cpu in asm_per_cpu X-Git-Tag: v6.12.46~5 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=fecd903917861edfdf379bd39857e5537e48a6b4;p=thirdparty%2Fkernel%2Fstable.git riscv: use lw when reading int cpu in asm_per_cpu commit f4ea67a722e8c9e1fb8109adebb9fb881ff0793a upstream. REG_L is wrong, because thread_info.cpu is 32-bit, not xlen-bit wide. The struct currently has a hole after cpu, so little endian accesses seemed fine. Fixes: be97d0db5f44 ("riscv: VMAP_STACK overflow detection thread-safe") Cc: stable@vger.kernel.org Reviewed-by: Alexandre Ghiti Signed-off-by: Radim Krčmář Link: https://lore.kernel.org/r/20250725165410.2896641-5-rkrcmar@ventanamicro.com Signed-off-by: Paul Walmsley Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/riscv/include/asm/asm.h b/arch/riscv/include/asm/asm.h index 776354895b81e..96a52344b2fb5 100644 --- a/arch/riscv/include/asm/asm.h +++ b/arch/riscv/include/asm/asm.h @@ -90,7 +90,7 @@ #endif .macro asm_per_cpu dst sym tmp - REG_L \tmp, TASK_TI_CPU_NUM(tp) + lw \tmp, TASK_TI_CPU_NUM(tp) slli \tmp, \tmp, PER_CPU_OFFSET_SHIFT la \dst, __per_cpu_offset add \dst, \dst, \tmp