[PATCH 11/18] locking/atomic: riscv: fix atomic64_sub_if_positive() offset argument

Mark Rutland
2019-05-22T13:25:05Z

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 <mark.rutland@arm.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: stable@vger.kernel.org
---
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