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Date: Thu, 9 Aug 2007 09:49:14 -0400 From: Chris Snook <csnook@...hat.com> To: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org, torvalds@...ux-foundation.org Cc: netdev@...r.kernel.org, akpm@...ux-foundation.org, ak@...e.de, heiko.carstens@...ibm.com, davem@...emloft.net, schwidefsky@...ibm.com, wensong@...ux-vs.org, horms@...ge.net.au, wjiang@...ilience.com, cfriesen@...tel.com, zlynx@....org, rpjday@...dspring.com, jesper.juhl@...il.com Subject: [PATCH 8/24] make atomic_read() behave consistently on i386 From: Chris Snook <csnook@...hat.com> Make atomic_read() volatile on i386, to ensure memory is actually read each time. Signed-off-by: Chris Snook <csnook@...hat.com> --- linux-2.6.23-rc2-orig/include/asm-i386/atomic.h 2007-07-08 19:32:17.000000000 -0400 +++ linux-2.6.23-rc2/include/asm-i386/atomic.h 2007-08-09 06:47:47.000000000 -0400 @@ -25,7 +25,7 @@ typedef struct { int counter; } atomic_t * * Atomically reads the value of @v. */ -#define atomic_read(v) ((v)->counter) +#define atomic_read(v) (*(volatile int *)&(v)->counter) /** * atomic_set - set atomic variable - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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