This is a note to let you know that I've just added the patch titled
ARM: 7699/1: sched_clock: Add more notrace to prevent recursion
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-7699-1-sched_clock-add-more-notrace-to-prevent-recursion.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cea15092f098b7018e89f64a5a14bb71955965d5 Mon Sep 17 00:00:00 2001
From: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Date: Thu, 18 Apr 2013 17:33:40 +0100
Subject: ARM: 7699/1: sched_clock: Add more notrace to prevent recursion
From: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Signed-off-by: Jonghwan Choi <jhbird.choi@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/kernel/sched_clock.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/arm/kernel/sched_clock.c
+++ b/arch/arm/kernel/sched_clock.c
@@ -45,12 +45,12 @@ static u32 notrace jiffy_sched_clock_rea
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;
Patches currently in stable-queue which might be from sboyd@xxxxxxxxxxxxxx are
queue-3.8/arm-7699-1-sched_clock-add-more-notrace-to-prevent-recursion.patch
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