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padata: use alignment when calculating the number of worker threads 

For multithreaded jobs the computed chunk size is rounded up by the
caller-specified alignment. However, the number of worker threads to
use is computed using the minimum chunk size without taking alignment
into account. A sufficiently large alignment value can result in too
many worker threads being allocated for the job.

Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Acked-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Anthony Yznaga 2023-02-22 16:33:12 -08:00 committed by Herbert Xu
parent 1e6204451f
commit f84155ca85
1 changed files with 1 additions and 1 deletions
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2
kernel/padata.c
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@ -491,7 +491,7 @@ void __init padata_do_multithreaded(struct padata_mt_job *job)
return;
/* Ensure at least one thread when size < min_chunk. */
nworks = max(job->size / job->min_chunk, 1ul);
nworks = max(job->size / max(job->min_chunk, job->align), 1ul);
nworks = min(nworks, job->max_threads);
if (nworks == 1) {