Re: [PATCH] m32r: Revise __raw_read_trylock()
From: Andrew Morton
Date: Tue Sep 26 2006 - 17:34:29 EST
On Mon, 25 Sep 2006 16:47:22 +0900
Hirokazu Takata <takata.hirokazu@xxxxxxxxxxx> wrote:
> Andrew, please drop and replace the previous my patch with the following
> Matthew's fix.
> Thank you.
> Signed-off-by: Hirokazu Takata <takata@xxxxxxxxxxxxxx>
> Cc: Matthew Wilcox <matthew@xxxxxx>
> include/asm-m32r/spinlock.h | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
> diff --git a/include/asm-m32r/spinlock.h b/include/asm-m32r/spinlock.h
> index f94c1a6..f9f9072 100644
> --- a/include/asm-m32r/spinlock.h
> +++ b/include/asm-m32r/spinlock.h
> @@ -298,7 +298,14 @@ #endif /* CONFIG_CHIP_M32700_TS1 */
> -#define __raw_read_trylock(lock) generic__raw_read_trylock(lock)
> +static inline int __raw_read_trylock(raw_rwlock_t *lock)
> + atomic_t *count = (atomic_t*)lock;
> + if (atomic_dec_return(count) >= 0)
> + return 1;
> + atomic_inc(count);
> + return 0;
We don't have a changelog for this patch. My usual technique when this
happens is to mutter something unprintable then go on a hunt through the
mailing list archives.
But all I have is "Matthew Wilcox pointed out that
generic__raw_read_trylock() is unfit for use.".
What's wrong with it?
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