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[075/118] include/linux/mm.h: clean up obsolete check on space in page->flags

Message ID 20200131061510.AX4sUc5J4%akpm@linux-foundation.org (mailing list archive)
State New, archived
Headers show
Series [001/118] lib/test_bitmap: correct test data offsets for 32-bit | expand

Commit Message

Andrew Morton Jan. 31, 2020, 6:15 a.m. UTC 
From: Yu Zhao <yuzhao@google.com>
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@google.com
Signed-off-by: Yu Zhao <yuzhao@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/mm.h |    4 ----
 1 file changed, 4 deletions(-)
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Patch

--- a/include/linux/mm.h~mm-clean-up-obsolete-check-on-space-in-page-flags
+++ a/include/linux/mm.h
@@ -916,10 +916,6 @@  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)