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authorMathias Krause <minipli@googlemail.com>2017-09-08 21:57:11 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2017-10-07 07:10:32 +0300
commit350ef88e7e922354f82a931897ad4a4ce6c686ff (patch)
tree1a4e182954c15959d059660ba124117c172fe5a3 /include/linux/padata.h
parentcf5868c8a22dc2854b96e9569064bb92365549ca (diff)
downloadlinux-350ef88e7e922354f82a931897ad4a4ce6c686ff.tar.xz
padata: ensure padata_do_serial() runs on the correct CPU
If the algorithm we're parallelizing is asynchronous we might change CPUs between padata_do_parallel() and padata_do_serial(). However, we don't expect this to happen as we need to enqueue the padata object into the per-cpu reorder queue we took it from, i.e. the same-cpu's parallel queue. Ensure we're not switching CPUs for a given padata object by tracking the CPU within the padata object. If the serial callback gets called on the wrong CPU, defer invoking padata_reorder() via a kernel worker on the CPU we're expected to run on. Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/linux/padata.h')
-rw-r--r--include/linux/padata.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/padata.h b/include/linux/padata.h
index 5c0175bbc179..5d13d25da2c8 100644
--- a/include/linux/padata.h
+++ b/include/linux/padata.h
@@ -37,6 +37,7 @@
* @list: List entry, to attach to the padata lists.
* @pd: Pointer to the internal control structure.
* @cb_cpu: Callback cpu for serializatioon.
+ * @cpu: Cpu for parallelization.
* @seq_nr: Sequence number of the parallelized data object.
* @info: Used to pass information from the parallel to the serial function.
* @parallel: Parallel execution function.
@@ -46,6 +47,7 @@ struct padata_priv {
struct list_head list;
struct parallel_data *pd;
int cb_cpu;
+ int cpu;
int info;
void (*parallel)(struct padata_priv *padata);
void (*serial)(struct padata_priv *padata);