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authorJens Axboe <axboe@kernel.dk>2013-11-08 09:08:12 -0700
committerJens Axboe <axboe@kernel.dk>2013-11-08 09:08:12 -0700
commite37459b8e2c7db6735e39e019e448b76e5e77647 (patch)
treea3f0944db87a8ae0d41e5acbbbabc1e7ef534d1b /kernel
parentc7d1ba417c7cb7297d14dd47a390ec90ce548d5c (diff)
parente7e245000110a7794de8f925b9edc06a9c852f80 (diff)
downloadlinux-e37459b8e2c7db6735e39e019e448b76e5e77647.tar.bz2
Merge branch 'blk-mq/core' into for-3.13/core
Signed-off-by: Jens Axboe <axboe@kernel.dk> Conflicts: block/blk-timeout.c
Diffstat (limited to 'kernel')
-rw-r--r--kernel/smp.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/smp.c b/kernel/smp.c
index 0564571dcdf7..dbc3d42d2c68 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -18,6 +18,7 @@
#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
enum {
CSD_FLAG_LOCK = 0x01,
+ CSD_FLAG_WAIT = 0x02,
};
struct call_function_data {
@@ -124,7 +125,7 @@ static void csd_lock(struct call_single_data *csd)
static void csd_unlock(struct call_single_data *csd)
{
- WARN_ON(!(csd->flags & CSD_FLAG_LOCK));
+ WARN_ON((csd->flags & CSD_FLAG_WAIT) && !(csd->flags & CSD_FLAG_LOCK));
/*
* ensure we're all done before releasing data:
@@ -146,6 +147,9 @@ void generic_exec_single(int cpu, struct call_single_data *csd, int wait)
unsigned long flags;
int ipi;
+ if (wait)
+ csd->flags |= CSD_FLAG_WAIT;
+
raw_spin_lock_irqsave(&dst->lock, flags);
ipi = list_empty(&dst->list);
list_add_tail(&csd->list, &dst->list);
@@ -340,6 +344,7 @@ void __smp_call_function_single(int cpu, struct call_single_data *csd,
}
put_cpu();
}
+EXPORT_SYMBOL_GPL(__smp_call_function_single);
/**
* smp_call_function_many(): Run a function on a set of other CPUs.