The patch titled
Subject: include/linux/page-flags-layout.h: correctly determine LAST_CPUPID_WIDTH
has been added to the -mm tree. Its filename is
mm-correctly-determine-last_cpupid_width.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-correctly-determine-last_cpupid_width.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-correctly-determine-last_cpupid_width.patch
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------------------------------------------------------
From: Yu Zhao <yuzhao@xxxxxxxxxx>
Subject: include/linux/page-flags-layout.h: correctly determine LAST_CPUPID_WIDTH
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.
Link: https://lkml.kernel.org/r/20210303071609.797782-1-yuzhao@xxxxxxxxxx
Signed-off-by: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/page-flags-layout.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/page-flags-layout.h~mm-correctly-determine-last_cpupid_width
+++ a/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
_
Patches currently in -mm which might be from yuzhao@xxxxxxxxxx are
mm-correctly-determine-last_cpupid_width.patch
mm-clean-up-include-linux-page-flags-layouth.patch
