linux-kernel - [PATCH 118/118] ARM: 7699/1: sched_clock: Add more notrace to prevent recursion

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Message-Id: <1367933964-1564-119-git-send-email-luis.henriques@canonical.com>
Date:	Tue,  7 May 2013 14:39:24 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Stephen Boyd <sboyd@...eaurora.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Jonghwan Choi <jhbird.choi@...sung.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 118/118] ARM: 7699/1: sched_clock: Add more notrace to prevent recursion

3.5.7.12 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stephen Boyd <sboyd@...eaurora.org>

commit cea15092f098b7018e89f64a5a14bb71955965d5 upstream.

cyc_to_sched_clock() is called by sched_clock() and cyc_to_ns()
is called by cyc_to_sched_clock(). I suspect that some compilers
inline both of these functions into sched_clock() and so we've
been getting away without having a notrace marking. It seems that
my compiler isn't inlining cyc_to_sched_clock() though, so I'm
hitting a recursion bug when I enable the function graph tracer,
causing my system to crash. Marking these functions notrace fixes
it. Technically cyc_to_ns() doesn't need the notrace because it's
already marked inline, but let's just add it so that if we ever
remove inline from that function it doesn't blow up.

Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 arch/arm/kernel/sched_clock.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/kernel/sched_clock.c b/arch/arm/kernel/sched_clock.c
index 6bbf936..926c98f 100644
--- a/arch/arm/kernel/sched_clock.c
+++ b/arch/arm/kernel/sched_clock.c
@@ -39,12 +39,12 @@ static u32 notrace jiffy_sched_clock_read(void)
 
 static u32 __read_mostly (*read_sched_clock)(void) = jiffy_sched_clock_read;
 
-static inline u64 cyc_to_ns(u64 cyc, u32 mult, u32 shift)
+static inline u64 notrace cyc_to_ns(u64 cyc, u32 mult, u32 shift)
 {
 	return (cyc * mult) >> shift;
 }
 
-static unsigned long long cyc_to_sched_clock(u32 cyc, u32 mask)
+static unsigned long long notrace cyc_to_sched_clock(u32 cyc, u32 mask)
 {
 	u64 epoch_ns;
 	u32 epoch_cyc;
-- 
1.8.1.2

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