Messages in this thread | | | Date | Mon, 20 Jan 2014 16:03:16 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v9 3/5] qrwlock, x86 - Treat all data type not bigger than long as atomic in x86 |
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On Tue, Jan 14, 2014 at 11:44:05PM -0500, Waiman Long wrote: > The generic __native_word() macro defined in include/linux/compiler.h > only allows "int" and "long" data types to be treated as native and > atomic. The x86 architecture, however, allow the use of char and short > data types as atomic as well. > > This patch extends the data type allowed in the __native_word() macro to > allow the use of char and short. > > Signed-off-by: Waiman Long <Waiman.Long@hp.com> > --- > arch/x86/include/asm/barrier.h | 8 ++++++++ > 1 files changed, 8 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h > index 04a4890..4d3e30a 100644 > --- a/arch/x86/include/asm/barrier.h > +++ b/arch/x86/include/asm/barrier.h > @@ -24,6 +24,14 @@ > #define wmb() asm volatile("sfence" ::: "memory") > #endif > > +/* > + * All data types <= long are atomic in x86 > + */ > +#ifdef __native_word > +#undef __native_word > +#endif > +#define __native_word(t) (sizeof(t) <= sizeof(long))
Yeah, not going to happen.
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