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Re: [PATCH 7/9] atomic.h : powerpc
- From: Benjamin Herrenschmidt <benh at kernel dot crashing dot org>
- To: Mathieu Desnoyers <mathieu dot desnoyers at polymtl dot ca>
- Cc: linux-kernel at vger dot kernel dot org, Andrew Morton <akpm at osdl dot org>, Ingo Molnar <mingo at redhat dot com>, Greg Kroah-Hartman <gregkh at suse dot de>, Christoph Hellwig <hch at infradead dot org>, paulus at samba dot org, "Martin J. Bligh" <mbligh at mbligh dot org>, linuxppc-dev at ozlabs dot org, Douglas Niehaus <niehaus at eecs dot ku dot edu>, ltt-dev at shafik dot org, systemtap at sources dot redhat dot com, Thomas Gleixner <tglx at linutronix dot de>
- Date: Thu, 21 Dec 2006 14:15:05 +1100
- Subject: Re: [PATCH 7/9] atomic.h : powerpc
- References: <20061221001204.GM28643@Krystal>
> +
> +/**
> + * atomic64_add_unless - add unless the number is a given value
> + * @v: pointer of type atomic64_t
> + * @a: the amount to add to v...
> + * @u: ...unless v is equal to u.
> + *
> + * Atomically adds @a to @v, so long as it was not @u.
> + * Returns non-zero if @v was not @u, and zero otherwise.
> + */
> +static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
> +{
> + long t;
> +
> + __asm__ __volatile__ (
> + LWSYNC_ON_SMP
> +"1: ldarx %0,0,%1 # atomic_add_unless\n\
> + cmpd 0,%0,%3 \n\
> + beq- 2f \n\
> + add %0,%2,%0 \n"
> + PPC405_ERR77(0,%2)
> +" stdcx. %0,0,%1 \n\
> + bne- 1b \n"
> + ISYNC_ON_SMP
> +" subf %0,%2,%0 \n\
> +2:"
> + : "=&r" (t)
> + : "r" (&v->counter), "r" (a), "r" (u)
> + : "cc", "memory");
> +
> + return t != u;
> +}
> +
You shouldn't try to define those when building 32 bits code... Also,
the PPC405 errata, as it's name implies, is specific to 405 cores which
are all 32 bits.
Ben.