| Message ID | 20210303071609.797782-1-yuzhao@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/2] mm: correctly determine LAST_CPUPID_WIDTH | expand |
diff --git a/include/linux/page-flags-layout.h b/include/linux/page-flags-layout.h index 7d4ec26d8a3e..295c2c687d2c 100644 --- a/include/linux/page-flags-layout.h +++ b/include/linux/page-flags-layout.h @@ -83,7 +83,7 @@ #define KASAN_TAG_WIDTH 0 #endif -#if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT+LAST_CPUPID_SHIFT+KASAN_TAG_WIDTH \ +#if SECTIONS_WIDTH+ZONES_WIDTH+NODES_WIDTH+LAST_CPUPID_SHIFT+KASAN_TAG_WIDTH \ <= BITS_PER_LONG - NR_PAGEFLAGS #define LAST_CPUPID_WIDTH LAST_CPUPID_SHIFT #else
The naming convention used in include/linux/page-flags-layout.h: *_SHIFT: the number of bits trying to allocate *_WIDTH: the number of bits successfully allocated So when it comes to LAST_CPUPID_WIDTH, we need to check whether all previous *_WIDTH and LAST_CPUPID_SHIFT can fit into page flags. This means we need to use NODES_WIDTH, not NODES_SHIFT. Signed-off-by: Yu Zhao <yuzhao@google.com> --- include/linux/page-flags-layout.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)