Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1277526

[PATCH v4 1/2] clocksource/drivers/dw_apb_timer: Inline apbt_readl and apbt_writel

Show all headers | View raw

It seems gcc can automatically inline apbt_writel() for us, but
apbt_real isn't inlined. This patch makes them inline to get a trivial
performance improvement: 4096 rounds of __apbt_read_clocksource() call
spend time on Marvell BG4CT platform:

 before the patch 1275240ns on average
 after the patch 1263240ns on average

so we get 1% performance improvement.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
---
 drivers/clocksource/dw_apb_timer.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/clocksource/dw_apb_timer.c b/drivers/clocksource/dw_apb_timer.c
index 3a6d9db..114696b 100644
--- a/drivers/clocksource/dw_apb_timer.c
+++ b/drivers/clocksource/dw_apb_timer.c
@@ -49,13 +49,13 @@ clocksource_to_dw_apb_clocksource(struct clocksource *cs)
 	return container_of(cs, struct dw_apb_clocksource, cs);
 }
 
-static u32 apbt_readl(struct dw_apb_timer *timer, unsigned long offs)
+static inline u32 apbt_readl(struct dw_apb_timer *timer, unsigned long offs)
 {
 	return readl(timer->base + offs);
 }
 
-static void apbt_writel(struct dw_apb_timer *timer, u32 val,
-		 unsigned long offs)
+static inline void apbt_writel(struct dw_apb_timer *timer, u32 val,
+			unsigned long offs)
 {
 	writel(val, timer->base + offs);
 }
-- 
2.6.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

[PATCH v4 1/2] clocksource/drivers/dw_apb_timer: Inline apbt_readl and apbt_writel Jisheng Zhang <jszhang@marvell.com> - 2015-11-25 17:10 +0100

csiph-web