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authorJisheng Zhang <jszhang@marvell.com>2015-10-20 16:02:36 +0800
committerDaniel Lezcano <daniel.lezcano@linaro.org>2015-10-27 01:33:18 +0100
commitf8af0e9c644caf64d0f42dce816c18346c744a9f (patch)
treeacc265ff78963bf83a18e14782af352d613d893f /drivers/clocksource/time-pistachio.c
parentd6df3576e6b4bcf765f5ace69915b4fa4a7ee1c3 (diff)
downloadop-kernel-dev-f8af0e9c644caf64d0f42dce816c18346c744a9f.zip
op-kernel-dev-f8af0e9c644caf64d0f42dce816c18346c744a9f.tar.gz
clocksource/drivers/pistachio: Prevent ftrace recursion
Currently pistachio can be used as a scheduler clock. We properly marked pistachio_read_sched_clock() as notrace but we then call another function pistachio_clocksource_read_cycles() that _wasn't_ notrace. Having a traceable function in the sched_clock() path leads to a recursion within ftrace and a kernel crash. Fix this by adding notrace attribute to the pistachio_clocksource_read_cycles() function. Signed-off-by: Jisheng Zhang <jszhang@marvell.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource/time-pistachio.c')
-rw-r--r--drivers/clocksource/time-pistachio.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/clocksource/time-pistachio.c b/drivers/clocksource/time-pistachio.c
index 18d4266..bba6799 100644
--- a/drivers/clocksource/time-pistachio.c
+++ b/drivers/clocksource/time-pistachio.c
@@ -67,7 +67,8 @@ static inline void gpt_writel(void __iomem *base, u32 value, u32 offset,
writel(value, base + 0x20 * gpt_id + offset);
}
-static cycle_t pistachio_clocksource_read_cycles(struct clocksource *cs)
+static cycle_t notrace
+pistachio_clocksource_read_cycles(struct clocksource *cs)
{
struct pistachio_clocksource *pcs = to_pistachio_clocksource(cs);
u32 counter, overflw;
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