diff options
Diffstat (limited to 'meta/recipes-kernel/linux/linux-omap-2.6.24.7/time-prevent-the-loop-in-timespec_add_ns-from-being-optimised-away.patch')
| -rw-r--r-- | meta/recipes-kernel/linux/linux-omap-2.6.24.7/time-prevent-the-loop-in-timespec_add_ns-from-being-optimised-away.patch | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/meta/recipes-kernel/linux/linux-omap-2.6.24.7/time-prevent-the-loop-in-timespec_add_ns-from-being-optimised-away.patch b/meta/recipes-kernel/linux/linux-omap-2.6.24.7/time-prevent-the-loop-in-timespec_add_ns-from-being-optimised-away.patch new file mode 100644 index 0000000000..58cbe7be23 --- /dev/null +++ b/meta/recipes-kernel/linux/linux-omap-2.6.24.7/time-prevent-the-loop-in-timespec_add_ns-from-being-optimised-away.patch @@ -0,0 +1,29 @@ +commit 38332cb98772f5ea757e6486bed7ed0381cb5f98 +Author: Segher Boessenkool <segher@kernel.crashing.org> +Date: Tue Mar 4 14:59:54 2008 -0800 + + time: prevent the loop in timespec_add_ns() from being optimised away + + Since some architectures don't support __udivdi3(). + + Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org> + Cc: john stultz <johnstul@us.ibm.com> + Cc: Ingo Molnar <mingo@elte.hu> + Signed-off-by: Andrew Morton <akpm@linux-foundation.org> + Signed-off-by: Thomas Gleixner <tglx@linutronix.de> + +diff --git a/include/linux/time.h b/include/linux/time.h +index 2091a19..d32ef0a 100644 +--- a/include/linux/time.h ++++ b/include/linux/time.h +@@ -174,6 +174,10 @@ static inline void timespec_add_ns(struct timespec *a, u64 ns) + { + ns += a->tv_nsec; + while(unlikely(ns >= NSEC_PER_SEC)) { ++ /* The following asm() prevents the compiler from ++ * optimising this loop into a modulo operation. */ ++ asm("" : "+r"(ns)); ++ + ns -= NSEC_PER_SEC; + a->tv_sec++; + } |