The patch titled
Subject: include/linux/mm.h: clean up obsolete check on space in page->flags
has been added to the -mm tree. Its filename is
mm-clean-up-obsolete-check-on-space-in-page-flags.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-clean-up-obsolete-check-on-space-in-page-flags.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-clean-up-obsolete-check-on-space-in-page-flags.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Yu Zhao <yuzhao@xxxxxxxxxx>
Subject: include/linux/mm.h: clean up obsolete check on space in page->flags
The check was intended to make sure we don't overrun page flags. But it's
obsolete because it doesn't include LAST_CPUPID_WIDTH nor KASAN_TAG_WIDTH.
Just remove check since we already have it covered in
linux/page-flags-layout.h (near the end of the file).
Link: http://lkml.kernel.org/r/20191208183508.89177-1-yuzhao@xxxxxxxxxx
Signed-off-by: Yu Zhao <yuzhao@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 4 ----
1 file changed, 4 deletions(-)
--- a/include/linux/mm.h~mm-clean-up-obsolete-check-on-space-in-page-flags
+++ a/include/linux/mm.h
@@ -921,10 +921,6 @@ vm_fault_t finish_mkwrite_fault(struct v
#define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
-#if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
-#error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS
-#endif
-
#define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
#define NODES_MASK ((1UL << NODES_WIDTH) - 1)
#define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
_
Patches currently in -mm which might be from yuzhao@xxxxxxxxxx are
mm-avoid-slub-allocation-while-holding-list_lock.patch
mm-clean-up-obsolete-check-on-space-in-page-flags.patch
