include/linux/gfp.h: fix the annotation of GFP_ZONE_TABLE

When bit is equal to 0x4, it means OPT_ZONE_DMA32 should be got from
GFP_ZONE_TABLE.  OPT_ZONE_DMA32 shall be equal to ZONE_DMA32 or
ZONE_NORMAL according to the status of CONFIG_ZONE_DMA32.

Similarly, when bit is equal to 0xc, that means OPT_ZONE_DMA32 should be
got with an allocation policy GFP_MOVABLE.  So ZONE_DMA32 or ZONE_NORMAL
is the possible result value.

Link: http://lkml.kernel.org/r/20180601163403.1032-1-yehs2007@zoho.comSigned-off-by: NHuaisheng Ye <yehs1@lenovo.com>
Reviewed-by: NAndrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

include/linux/gfp.h

@@ -343,7 +343,7 @@ static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags)
  *       0x1    => DMA or NORMAL
  *       0x2    => HIGHMEM or NORMAL
  *       0x3    => BAD (DMA+HIGHMEM)
- *       0x4    => DMA32 or DMA or NORMAL
+ *       0x4    => DMA32 or NORMAL
  *       0x5    => BAD (DMA+DMA32)
  *       0x6    => BAD (HIGHMEM+DMA32)
  *       0x7    => BAD (HIGHMEM+DMA32+DMA)
@@ -351,7 +351,7 @@ static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags)
  *       0x9    => DMA or NORMAL (MOVABLE+DMA)
  *       0xa    => MOVABLE (Movable is valid only if HIGHMEM is set too)
  *       0xb    => BAD (MOVABLE+HIGHMEM+DMA)
- *       0xc    => DMA32 (MOVABLE+DMA32)
+ *       0xc    => DMA32 or NORMAL (MOVABLE+DMA32)
  *       0xd    => BAD (MOVABLE+DMA32+DMA)
  *       0xe    => BAD (MOVABLE+DMA32+HIGHMEM)
  *       0xf    => BAD (MOVABLE+DMA32+HIGHMEM+DMA)