[tip:locking/core] locking/atomic, riscv: Fix atomic64_sub_if_positive() offset argument

[tip-bot for Mark Rutland]

Commit-ID:  33e42ef571979fe6601ac838d338eb599d842a6d
Gitweb:     https://git.kernel.org/tip/33e42ef571979fe6601ac838d338eb599d842a6d
Author:     Mark Rutland <mark.rutland@xxxxxxx>
AuthorDate: Wed, 22 May 2019 14:22:43 +0100
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 3 Jun 2019 12:32:56 +0200

locking/atomic, riscv: Fix atomic64_sub_if_positive() offset argument

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@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Palmer Dabbelt <palmer@xxxxxxxxxx>
Cc: Albert Ou <aou@xxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: arnd@xxxxxxxx
Cc: bp@xxxxxxxxx
Cc: catalin.marinas@xxxxxxx
Cc: davem@xxxxxxxxxxxxx
Cc: fenghua.yu@xxxxxxxxx
Cc: heiko.carstens@xxxxxxxxxx
Cc: herbert@xxxxxxxxxxxxxxxxxxx
Cc: ink@xxxxxxxxxxxxxxxxxxxx
Cc: jhogan@xxxxxxxxxx
Cc: linux@xxxxxxxxxxxxxxx
Cc: mattst88@xxxxxxxxx
Cc: mpe@xxxxxxxxxxxxxx
Cc: paul.burton@xxxxxxxx
Cc: paulus@xxxxxxxxx
Cc: ralf@xxxxxxxxxxxxxx
Cc: rth@xxxxxxxxxxx
Cc: tony.luck@xxxxxxxxx
Cc: vgupta@xxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20190522132250.26499-12-mark.rutland@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 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 9038aeb900a6..9c263bd9d5ad 100644
--- a/arch/riscv/include/asm/atomic.h
+++ b/arch/riscv/include/asm/atomic.h
@@ -332,7 +332,7 @@ 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;