Messages in this thread | | | Date | Thu, 05 Jun 2008 16:27:00 +0100 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH 1/1] x86 atomic operations: atomic_or_long atomic_inc_short |
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Cliff Wickman wrote: > From: Cliff Wickman <cpw@sgi.com> > > Provide atomic operations for increment of a 16-bit integer and > logical OR into a 64-bit integer. > > [ This patch was split off of patch: > SGI UV: TLB shootdown using broadcast assist unit > and improved with advice from Jeremy Fitzhardinge <jeremy@goop.org> ] > > Diffed against 2.6.26-rc4 > > Signed-off-by: Cliff Wickman <cpw@sgi.com> > Reviewed-by: Jeremy Fitzhardinge <jeremy@goop.org>
> --- > include/asm-x86/atomic_64.h | 26 ++++++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > Index: linux/include/asm-x86/atomic_64.h > =================================================================== > --- linux.orig/include/asm-x86/atomic_64.h > +++ linux/include/asm-x86/atomic_64.h > @@ -431,6 +431,32 @@ static inline int atomic64_add_unless(at > return c != (u); > } > > +/** > + * atomic_inc_short - increment of a short integer > + * @v: pointer to type int > + * > + * Atomically adds 1 to @v > + * Returns the new value of @u > + */ > +static inline short int atomic_inc_short(short int *v) > +{ > + asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v)); > + return *v; > +} > + > +/** > + * atomic_or_long - OR of two long integers > + * @v1: pointer to type unsigned long > + * @v2: pointer to type unsigned long > + * > + * Atomically ORs @v1 and @v2 > + * Returns the result of the OR > + */ > +static inline void atomic_or_long(unsigned long *v1, unsigned long v2) > +{ > + asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2)); > +} > + > #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) > > /* These are x86-specific, used by some header files */ > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
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