Messages in this thread Patch in this message | | | From | Mandeep Singh Baines <> | Subject | [PATCH] ARM: exynos: mct: cache mct upper count | Date | Wed, 5 Sep 2012 14:36:13 -0700 |
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Saves one register read.
Before (perf report):
1.40% [k] exynos4_frc_read | |--87.20%-- ktime_get_ts | | | |--93.60%-- posix_ktime_get_ts
After (perf report):
1.00% [k] exynos4_frc_read | |--88.61%-- ktime_get_ts | | | |--92.70%-- posix_ktime_get_ts
Signed-off-by: Mandeep Singh Baines <msb@chromium.org> CC: Sonny Rao <sonnyrao@chromium.org> CC: Olof Johansson <olofj@chromium.org> CC: Kukjin Kim <kgene.kim@samsung.com> CC: Russell King <linux@arm.linux.org.uk> CC: linux-arm-kernel@lists.infradead.org CC: linux-samsung-soc@vger.kernel.org --- arch/arm/mach-exynos/mct.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-exynos/mct.c b/arch/arm/mach-exynos/mct.c index b601fb8..2bbd533 100644 --- a/arch/arm/mach-exynos/mct.c +++ b/arch/arm/mach-exynos/mct.c @@ -128,8 +128,8 @@ static void exynos4_mct_frc_start(u32 hi, u32 lo) static cycle_t exynos4_frc_read(struct clocksource *cs) { - unsigned int lo, hi; - u32 hi2 = __raw_readl(EXYNOS4_MCT_G_CNT_U); + u32 lo, hi; + static u32 hi2; do { hi = hi2; -- 1.7.7.3
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