diff options
| author | Mathias Krause <minipli@googlemail.com> | 2017-09-08 21:57:11 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2017-10-07 07:10:32 +0300 |
| commit | 350ef88e7e922354f82a931897ad4a4ce6c686ff (patch) | |
| tree | 1a4e182954c15959d059660ba124117c172fe5a3 /include/linux/padata.h | |
| parent | cf5868c8a22dc2854b96e9569064bb92365549ca (diff) | |
| download | linux-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.h | 2 |
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); |