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| author | Mathias Krause <minipli@googlemail.com> | 2017-09-08 21:57:11 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-27 17:40:23 +0300 |
| commit | 3c74e59f30ccfb4937a9814631cc828f64427de3 (patch) | |
| tree | adbc1afea65fa3d8c9cdf228d1118015d42a6a98 /include | |
| parent | f4fb6f1523d43cd2b56f99559ba4b86b83901a25 (diff) | |
| download | linux-3c74e59f30ccfb4937a9814631cc828f64427de3.tar.xz | |
padata: ensure padata_do_serial() runs on the correct CPU
commit 350ef88e7e922354f82a931897ad4a4ce6c686ff upstream.
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>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -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 963e69ff4659..e74d61fa50fe 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); |