Presently the riscv implementation of atomic64_sub_if_positive() takes a 32-bit offset value rather than a 64-bit offset value as it should do. Thus, if called with a 64-bit offset, the value will be unexpectedly truncated to 32 bits.
Fix this by taking the offset as a long rather than an int. Signed-off-by: Mark Rutland <[email protected]> Cc: Albert Ou <[email protected]> Cc: Palmer Dabbelt <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] --- arch/riscv/include/asm/atomic.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/riscv/include/asm/atomic.h b/arch/riscv/include/asm/atomic.h index 93826771b616..c9e18289d65c 100644 --- a/arch/riscv/include/asm/atomic.h +++ b/arch/riscv/include/asm/atomic.h @@ -336,7 +336,7 @@ static __always_inline int atomic_sub_if_positive(atomic_t *v, int offset) #define atomic_dec_if_positive(v) atomic_sub_if_positive(v, 1) #ifndef CONFIG_GENERIC_ATOMIC64 -static __always_inline long atomic64_sub_if_positive(atomic64_t *v, int offset) +static __always_inline long atomic64_sub_if_positive(atomic64_t *v, long offset) { long prev, rc; -- 2.11.0
