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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.com Signed-off-by: Huaisheng Ye <yehs1@lenovo.com> Reviewed-by: Andrew 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: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.