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0e5ffe9b2b
It is confusing for vmg->target to sometimes be the target merged VMA and in one case not. Fix this by having commit_merge() use its awareness of the vmg->_adjust_next_start case to know that it is manipulating a separate vma, abstracted in the 'vma' local variable. Place removal and adjust VMA determination logic into init_multi_vma_prep(), as the flags give us enough information to do so, and since this is the function that sets up the vma_prepare struct it makes sense to do so here. Doing this significantly simplifies commit_merge(), allowing us to eliminate the 'merge_target' handling, initialise the VMA iterator in a more sensible place and simply return vmg->target consistently. This also allows us to simplify setting vmg->target in vma_merge_existing_range() since we are then left only with two cases - merge left (or both) where the target is vmg->prev or merge right in which the target is vmg->next. This makes it easy for somebody reading the code to know what VMA will actually be the one returned and merged into and removes a great deal of the confusing 'adjust' nonsense. This patch has no change in functional behaviour. Link: https://lkml.kernel.org/r/50f96e31ab1980eaaf1006e34a4f6e6dad9320b8.1738326519.git.lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Cc: Jann Horn <jannh@google.com> Cc: Liam Howlett <liam.howlett@oracle.com> Signed-off-by: Andrew Morton <akpm@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 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.