percpu: fix first chunk size calculation for populated bitmap

mcsmonk · dennisszhou · commit b3b33d3c43bb · 2020-09-17T17:34:39.000Z
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: 8ab16c4 ("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>
diff --git a/mm/percpu.c b/mm/percpu.c
@@ -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__,
