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riscv: use lw when reading int cpu in asm_per_cpu

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commit f4ea67a722 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: be97d0db5f ("riscv: VMAP_STACK overflow detection thread-safe")
Cc: stable@vger.kernel.org
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com>
Link: https://lore.kernel.org/r/20250725165410.2896641-5-rkrcmar@ventanamicro.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Radim Krčmář 2025-07-25 18:54:10 +02:00 committed by Greg Kroah-Hartman
parent b363a9e06b
commit b5176a7d45
1 changed files with 1 additions and 1 deletions
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2
arch/riscv/include/asm/asm.h
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@ -91,7 +91,7 @@
#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