From: Sunghyun Jin <mcsmonk@gmail.com>
Date: Thu, 3 Sep 2020 12:41:16 +0000 (+0900)
Subject: percpu: fix first chunk size calculation for populated bitmap
X-Git-Tag: v5.8.11~24
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75b98fcaf902ff6400ed75daa2e342f8a5e5c048;p=thirdparty%2Fkernel%2Fstable.git

percpu: fix first chunk size calculation for populated bitmap

commit b3b33d3c43bbe0177d70653f4e889c78cc37f097 upstream.

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: 8ab16c43ea79 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/mm/percpu.c b/mm/percpu.c
index 696367b182221..d83e0032cb209 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1300,7 +1300,7 @@ 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__,