From mboxrd@z Thu Jan 1 00:00:00 1970 From: msb@chromium.org (Mandeep Singh Baines) Date: Wed, 5 Sep 2012 14:34:54 -0700 Subject: [PATCH] ARM: exynos: mct: cache mct upper count Message-ID: <1346880894-31316-1-git-send-email-msb@chromium.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Saves one register read. BUG=none TEST=See below. 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 CC: Sonny Rao CC: Olof Johansson CC: Kukjin Kim CC: Russell King CC: linux-arm-kernel at lists.infradead.org CC: linux-samsung-soc at 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