Commit b3b33d3c authored Sep 03, 2020 by Sunghyun Jin Committed by Dennis Zhou Sep 17, 2020

percpu: fix first chunk size calculation for populated bitmap



Variable populated, which is a member of struct pcpu_chunk, is used as a
unit of size of unsigned long.
However, size of populated is miscounted. So, I fix this minor part.

Fixes: 8ab16c43 ("percpu: change the number of pages marked in the first_chunk pop bitmap")
Cc: <stable@vger.kernel.org> # 4.14+
Signed-off-by: Sunghyun Jin <mcsmonk@gmail.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>

parent f75aef39

mm/percpu.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1316,7 +1316,7 @@ static struct pcpu_chunk * __init pcpu_alloc_first_chunk(unsigned long tmp_addr,

		/* allocate chunk */
		alloc_size = sizeof(struct pcpu_chunk) +
		BITS_TO_LONGS(region_size >> PAGE_SHIFT);
		BITS_TO_LONGS(region_size >> PAGE_SHIFT) * sizeof(unsigned long);
		chunk = memblock_alloc(alloc_size, SMP_CACHE_BYTES);
		if (!chunk)
		panic("%s: Failed to allocate %zu bytes\n", __func__,

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