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lib: kunit_iov_iter: repeatedly call alloc_pages_bulk()

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[ Upstream commit 9ac9a08e4a ]

alloc_pages_bulk() is not guaranteed to return all requested pages in a
single call.

Call it repeatedly until all pages have been allocated or no more progress
is being made.

Link: https://lore.kernel.org/20260526-kunit_iov_iter-alloc_bulk-v2-1-24fbcd995c61@weissschuh.net
Fixes: 2d71340ff1 ("iov_iter: Kunit tests for copying to/from an iterator")
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Cc: "Christian A. Ehrhardt" <lk@c--e.de>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thomas Weißschuh
2026-07-24 16:16:00 +02:00
committed by Greg Kroah-Hartman
parent bb44a7690a
commit 3fe2d0d21c
1 changed files with 10 additions and 2 deletions
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lib/tests/kunit_iov_iter.c
+10 -2
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@@ -50,14 +50,22 @@ static void *__init iov_kunit_create_buffer(struct kunit *test,
size_t npages)
{
struct page **pages;
unsigned long got;
unsigned long got, last;
void *buffer;
pages = kzalloc_objs(struct page *, npages, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pages);
*ppages = pages;
got = alloc_pages_bulk(GFP_KERNEL, npages, pages);
got = 0;
while (true) {
last = got;
got = alloc_pages_bulk(GFP_KERNEL, npages, pages);
if (last == got || got == npages)
break;
}
if (got != npages) {
release_pages(pages, got);
kvfree(pages);