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mm/vma: introduce abort_munmap_vmas()

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Extract clean up of failed munmap() operations from do_vmi_align_munmap().
This simplifies later patches in the series.

It is worth noting that the mas_for_each() loop now has a different upper
limit.  This should not change the number of vmas visited for reattaching
to the main vma tree (mm_mt), as all vmas are reattached in both
scenarios.

Link: https://lkml.kernel.org/r/20240830040101.822209-3-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Cc: Bert Karwatzki <spasswolf@web.de>
Cc: Jeff Xu <jeffxu@chromium.org>
Cc: Jiri Olsa <olsajiri@gmail.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2024-08-30 00:00:42 -04:00 committed by Andrew Morton
parent b7012d513f
commit 7e7b2370ed
1 changed files with 17 additions and 5 deletions
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22
mm/vma.c
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@ -668,6 +668,22 @@ void vma_complete(struct vma_prepare *vp,
validate_mm(mm);
}
/*
* abort_munmap_vmas - Undo any munmap work and free resources
*
* Reattach any detached vmas and free up the maple tree used to track the vmas.
*/
static inline void abort_munmap_vmas(struct ma_state *mas_detach)
{
struct vm_area_struct *vma;
mas_set(mas_detach, 0);
mas_for_each(mas_detach, vma, ULONG_MAX)
vma_mark_detached(vma, false);
__mt_destroy(mas_detach->tree);
}
/*
* do_vmi_align_munmap() - munmap the aligned region from @start to @end.
* @vmi: The vma iterator
@ -834,11 +850,7 @@ do_vmi_align_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma,
userfaultfd_error:
munmap_gather_failed:
end_split_failed:
mas_set(&mas_detach, 0);
mas_for_each(&mas_detach, next, end)
vma_mark_detached(next, false);
__mt_destroy(&mt_detach);
abort_munmap_vmas(&mas_detach);
start_split_failed:
map_count_exceeded:
validate_mm(mm);