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Patch series "tools/testing: expand mremap testing". Expand our mremap() testing to further assert that behaviour is as expected. There is a poorly documented mremap() feature whereby it is possible to mremap() multiple VMAs (even with gaps) when shrinking, as long as the resultant shrunk range spans only a single VMA. So we start by asserting this behaviour functions correctly both with an in-place shrink and a shrink/move. Next, we further test the newly introduced ability to mremap() multiple VMAs when performing a MAP_FIXED move (that is without the size being changed), firstly by asserting that MREMAP_DONTUNMAP has no bearing on this behaviour. Finally, we explicitly test that such moves, when splitting source VMAs, function correctly. This patch (of 3): There is an apparently little-known feature of mremap() whereby, in stark contrast to other modes (other than the recently introduced capacity to move multiple VMAs), the input source range span multiple VMAs with gaps between. This is, when shrinking a VMA, whether moving it or not, and the shrink would reduce the range to a single VMA - this is permitted, as the shrink is actioned by an unmap. This patch adds tests to assert that this behaves as expected. Link: https://lkml.kernel.org/r/cover.1753119043.git.lorenzo.stoakes@oracle.com Link: https://lkml.kernel.org/r/f08122893a26092a2bec6e69443e87f468ffdbed.1753119043.git.lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Jann Horn <jannh@google.com> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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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 reStructuredText 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.