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Currently __vma_unlink_common handles two cases: * has_prev * or not When has_prev is false, it is obvious prev is calculated from vma->vm_prev in __vma_unlink_common. When has_prev is true, the prev is passed through from __vma_unlink_prev in __vma_adjust for non-case 8. And at the beginning next is calculated from vma->vm_next, which implies vma is next->vm_prev. The above statement sounds a little complicated, while to think in another point of view, no matter whether vma and next is swapped, the mmap link list still preserves its property. It is proper to access vma->vm_prev. Link: http://lkml.kernel.org/r/20191006012636.31521-1-richardw.yang@linux.intel.com Signed-off-by: Wei Yang <richardw.yang@linux.intel.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Oscar Salvador <osalvador@suse.de> Cc: Christoph Hellwig <hch@infradead.org> Cc: Matthew Wilcox (Oracle) <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.
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.