linux-kernel - [PATCH 5.8 095/118] percpu: fix first chunk size calculation for populated bitmap

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Message-Id: <20200921162040.773527953@linuxfoundation.org>
Date:   Mon, 21 Sep 2020 18:28:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sunghyun Jin <mcsmonk@...il.com>,
        Dennis Zhou <dennis@...nel.org>
Subject: [PATCH 5.8 095/118] percpu: fix first chunk size calculation for populated bitmap

From: Sunghyun Jin <mcsmonk@...il.com>

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@...r.kernel.org> # 4.14+
Signed-off-by: Sunghyun Jin <mcsmonk@...il.com>
Signed-off-by: Dennis Zhou <dennis@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 mm/percpu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1300,7 +1300,7 @@ static struct pcpu_chunk * __init pcpu_a
 
 	/* 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__,