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| author | Mathias Krause <minipli@googlemail.com> | 2020-05-21 16:46:55 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-27 16:43:04 +0200 |
| commit | 6949737c1e6399787a957dc251b1de5ee6c801bf (patch) | |
| tree | e06865d7a9c84b48d34c1f0324922b7d42c5a008 /kernel | |
| parent | 74607fdfb8acccd05031c6b21f2ee7d1a1b4724b (diff) | |
| download | linux-6949737c1e6399787a957dc251b1de5ee6c801bf.tar.gz linux-6949737c1e6399787a957dc251b1de5ee6c801bf.tar.bz2 linux-6949737c1e6399787a957dc251b1de5ee6c801bf.zip | |
padata: set cpu_index of unused CPUs to -1
[ Upstream commit 1bd845bcb41d5b7f83745e0cb99273eb376f2ec5 ]
The parallel queue per-cpu data structure gets initialized only for CPUs
in the 'pcpu' CPU mask set. This is not sufficient as the reorder timer
may run on a different CPU and might wrongly decide it's the target CPU
for the next reorder item as per-cpu memory gets memset(0) and we might
be waiting for the first CPU in cpumask.pcpu, i.e. cpu_index 0.
Make the '__this_cpu_read(pd->pqueue->cpu_index) == next_queue->cpu_index'
compare in padata_get_next() fail in this case by initializing the
cpu_index member of all per-cpu parallel queues. Use -1 for unused ones.
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/padata.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/padata.c b/kernel/padata.c index 40a0ebb8ea51..858e82179744 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -462,8 +462,14 @@ static void padata_init_pqueues(struct parallel_data *pd) struct padata_parallel_queue *pqueue; cpu_index = 0; - for_each_cpu(cpu, pd->cpumask.pcpu) { + for_each_possible_cpu(cpu) { pqueue = per_cpu_ptr(pd->pqueue, cpu); + + if (!cpumask_test_cpu(cpu, pd->cpumask.pcpu)) { + pqueue->cpu_index = -1; + continue; + } + pqueue->pd = pd; pqueue->cpu_index = cpu_index; cpu_index++; |