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ARM: 7699/1: sched_clock: Add more notrace to prevent recursion 

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@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Stephen Boyd 2013-04-18 17:33:40 +01:00 committed by Russell King
parent cb2d8b342a
commit cea15092f0
1 changed files with 2 additions and 2 deletions
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4
arch/arm/kernel/sched_clock.c
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@ -45,12 +45,12 @@ static u32 notrace jiffy_sched_clock_read(void)
static u32 __read_mostly (*read_sched_clock)(void) = jiffy_sched_clock_read; 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; 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; u64 epoch_ns;
u32 epoch_cyc; u32 epoch_cyc;