linux-kernel - [PATCH] mm: save two stranding bit in gfp

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Date:   Wed, 16 May 2018 13:20:23 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Thelen <gthelen@...gle.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Vlastimil Babka <vbabka@...e.cz>
Cc:     Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        Shakeel Butt <shakeelb@...gle.com>
Subject: [PATCH] mm: save two stranding bit in gfp_mask

___GFP_COLD and ___GFP_OTHER_NODE were removed but their bits were
stranded. Slide existing gfp masks to make those two bits available.

Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
---
 include/linux/gfp.h | 42 +++++++++++++++++++++---------------------
 1 file changed, 21 insertions(+), 21 deletions(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 1a4582b44d32..8edf72d32411 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -16,31 +16,31 @@ struct vm_area_struct;
  */
 
 /* Plain integer GFP bitmasks. Do not use this directly. */
-#define ___GFP_DMA		0x01u
-#define ___GFP_HIGHMEM		0x02u
-#define ___GFP_DMA32		0x04u
-#define ___GFP_MOVABLE		0x08u
+#define ___GFP_DMA		0x1u
+#define ___GFP_HIGHMEM		0x2u
+#define ___GFP_DMA32		0x4u
+#define ___GFP_MOVABLE		0x8u
 #define ___GFP_RECLAIMABLE	0x10u
 #define ___GFP_HIGH		0x20u
 #define ___GFP_IO		0x40u
 #define ___GFP_FS		0x80u
-#define ___GFP_NOWARN		0x200u
-#define ___GFP_RETRY_MAYFAIL	0x400u
-#define ___GFP_NOFAIL		0x800u
-#define ___GFP_NORETRY		0x1000u
-#define ___GFP_MEMALLOC		0x2000u
-#define ___GFP_COMP		0x4000u
-#define ___GFP_ZERO		0x8000u
-#define ___GFP_NOMEMALLOC	0x10000u
-#define ___GFP_HARDWALL		0x20000u
-#define ___GFP_THISNODE		0x40000u
-#define ___GFP_ATOMIC		0x80000u
-#define ___GFP_ACCOUNT		0x100000u
-#define ___GFP_DIRECT_RECLAIM	0x400000u
-#define ___GFP_WRITE		0x800000u
-#define ___GFP_KSWAPD_RECLAIM	0x1000000u
+#define ___GFP_NOWARN		0x100u
+#define ___GFP_RETRY_MAYFAIL	0x200u
+#define ___GFP_NOFAIL		0x400u
+#define ___GFP_NORETRY		0x800u
+#define ___GFP_MEMALLOC		0x1000u
+#define ___GFP_COMP		0x2000u
+#define ___GFP_ZERO		0x4000u
+#define ___GFP_NOMEMALLOC	0x8000u
+#define ___GFP_HARDWALL		0x10000u
+#define ___GFP_THISNODE		0x20000u
+#define ___GFP_ATOMIC		0x40000u
+#define ___GFP_ACCOUNT		0x80000u
+#define ___GFP_DIRECT_RECLAIM	0x100000u
+#define ___GFP_WRITE		0x200000u
+#define ___GFP_KSWAPD_RECLAIM	0x400000u
 #ifdef CONFIG_LOCKDEP
-#define ___GFP_NOLOCKDEP	0x2000000u
+#define ___GFP_NOLOCKDEP	0x800000u
 #else
 #define ___GFP_NOLOCKDEP	0
 #endif
@@ -205,7 +205,7 @@ struct vm_area_struct;
 #define __GFP_NOLOCKDEP ((__force gfp_t)___GFP_NOLOCKDEP)
 
 /* Room for N __GFP_FOO bits */
-#define __GFP_BITS_SHIFT (25 + IS_ENABLED(CONFIG_LOCKDEP))
+#define __GFP_BITS_SHIFT (23 + IS_ENABLED(CONFIG_LOCKDEP))
 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
 
 /*
-- 
2.17.0.441.gb46fe60e1d-goog