padata: Clean up in padata_do_multithreaded()

JIRA: https://issues.redhat.com/browse/RHEL-81522

commit e45f0ab
Author: Zicheng Qu <quzicheng@huawei.com>
Date:   Fri, 1 Nov 2024 09:13:24 +0000

    padata: Clean up in padata_do_multithreaded()

    In commit 24cc57d ("padata: Honor the caller's alignment in case of
    chunk_size 0"), the line 'ps.chunk_size = max(ps.chunk_size, 1ul)' was
    added, making 'ps.chunk_size = 1U' redundant and never executed.

    Signed-off-by: Zicheng Qu <quzicheng@huawei.com>
    Acked-by: Daniel Jordan <daniel.m.jordan@oracle.com>
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Signed-off-by: Waiman Long <longman@redhat.com>

Author: Waiman-Long

kernel/padata.c

@@ -521,13 +521,6 @@ void __init padata_do_multithreaded(struct padata_mt_job *job)
 	ps.chunk_size = max(ps.chunk_size, 1ul);
 	ps.chunk_size = roundup(ps.chunk_size, job->align);
 
-	/*
-	 * chunk_size can be 0 if the caller sets min_chunk to 0. So force it
-	 * to at least 1 to prevent divide-by-0 panic in padata_mt_helper().`
-	 */
-	if (!ps.chunk_size)
-		ps.chunk_size = 1U;
-
 	list_for_each_entry(pw, &works, pw_list)
 		if (job->numa_aware) {
 			int old_node = atomic_read(&last_used_nid);