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authorStephen Boyd2013-07-18 16:21:15 -0700
committerJohn Stultz2013-07-30 11:24:20 -0700
commit85c3d2dd15be4d577a37ffb8bbbd019fc8e3280a (patch)
treedb6f0d5ed69e55b7509793c111dc0dc5a57d43fd /kernel/time
parent87d8b9eb7eb6669aad6435a51e9862362141ba76 (diff)
sched_clock: Use seqcount instead of rolling our own
We're going to increase the cyc value to 64 bits in the near future. Doing that is going to break the custom seqcount implementation in the sched_clock code because 64 bit numbers aren't guaranteed to be atomic. Replace the cyc_copy with a seqcount to avoid this problem. Cc: Russell King <linux@arm.linux.org.uk> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/sched_clock.c27
1 files changed, 8 insertions, 19 deletions
diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c
index a326f27d7f09..396f7b9dccc9 100644
--- a/kernel/time/sched_clock.c
+++ b/kernel/time/sched_clock.c
@@ -14,11 +14,12 @@
#include <linux/syscore_ops.h>
#include <linux/timer.h>
#include <linux/sched_clock.h>
+#include <linux/seqlock.h>
struct clock_data {
u64 epoch_ns;
u32 epoch_cyc;
- u32 epoch_cyc_copy;
+ seqcount_t seq;
unsigned long rate;
u32 mult;
u32 shift;
@@ -54,23 +55,16 @@ static unsigned long long notrace sched_clock_32(void)
u64 epoch_ns;
u32 epoch_cyc;
u32 cyc;
+ unsigned long seq;
if (cd.suspended)
return cd.epoch_ns;
- /*
- * Load the epoch_cyc and epoch_ns atomically. We do this by
- * ensuring that we always write epoch_cyc, epoch_ns and
- * epoch_cyc_copy in strict order, and read them in strict order.
- * If epoch_cyc and epoch_cyc_copy are not equal, then we're in
- * the middle of an update, and we should repeat the load.
- */
do {
+ seq = read_seqcount_begin(&cd.seq);
epoch_cyc = cd.epoch_cyc;
- smp_rmb();
epoch_ns = cd.epoch_ns;
- smp_rmb();
- } while (epoch_cyc != cd.epoch_cyc_copy);
+ } while (read_seqcount_retry(&cd.seq, seq));
cyc = read_sched_clock();
cyc = (cyc - epoch_cyc) & sched_clock_mask;
@@ -90,16 +84,12 @@ static void notrace update_sched_clock(void)
ns = cd.epoch_ns +
cyc_to_ns((cyc - cd.epoch_cyc) & sched_clock_mask,
cd.mult, cd.shift);
- /*
- * Write epoch_cyc and epoch_ns in a way that the update is
- * detectable in cyc_to_fixed_sched_clock().
- */
+
raw_local_irq_save(flags);
- cd.epoch_cyc_copy = cyc;
- smp_wmb();
+ write_seqcount_begin(&cd.seq);
cd.epoch_ns = ns;
- smp_wmb();
cd.epoch_cyc = cyc;
+ write_seqcount_end(&cd.seq);
raw_local_irq_restore(flags);
}
@@ -195,7 +185,6 @@ static int sched_clock_suspend(void)
static void sched_clock_resume(void)
{
cd.epoch_cyc = read_sched_clock();
- cd.epoch_cyc_copy = cd.epoch_cyc;
cd.suspended = false;
}