linux-kernel - Re: [PATCH 11/18] locking/atomic: riscv: fix atomic64_sub_if

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Message-ID: <mhng-07aca7a6-5b81-401d-9f0a-438fcd9aef43@palmer-si-x1e>
Date:   Wed, 22 May 2019 12:06:29 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...ive.com>
To:     mark.rutland@....com
CC:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        Will Deacon <will.deacon@....com>, aou@...s.berkeley.edu,
        Arnd Bergmann <arnd@...db.de>, bp@...en8.de,
        catalin.marinas@....com, davem@...emloft.net, fenghua.yu@...el.com,
        heiko.carstens@...ibm.com, herbert@...dor.apana.org.au,
        ink@...assic.park.msu.ru, jhogan@...nel.org, linux@...linux.org.uk,
        mark.rutland@....com, mattst88@...il.com, mingo@...nel.org,
        mpe@...erman.id.au, paul.burton@...s.com, paulus@...ba.org,
        ralf@...ux-mips.org, rth@...ddle.net, stable@...r.kernel.org,
        tglx@...utronix.de, tony.luck@...el.com, vgupta@...opsys.com
Subject:     Re: [PATCH 11/18] locking/atomic: riscv: fix atomic64_sub_if_positive() offset argument

On Wed, 22 May 2019 06:22:43 PDT (-0700), mark.rutland@....com wrote:
> 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@....com>
> Cc: Albert Ou <aou@...s.berkeley.edu>
> Cc: Palmer Dabbelt <palmer@...ive.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Will Deacon <will.deacon@....com>
> Cc: stable@...r.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;

Reviewed-by: Palmer Dabbelt <palmer@...ive.com>

Thanks!