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tools/testing/vma: add VMA userland tests for VMA flag functions

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Now we have the capability to test the new helpers for the bitmap VMA
flags in userland, do so.

We also update the Makefile such that both VMA (and while we're here)
mm_struct flag sizes can be customised on build.  We default to 128-bit to
enable testing of flags above word size even on 64-bit systems.

We add userland tests to ensure that we do not regress VMA flag behaviour
with the introduction when using bitmap VMA flags, nor accidentally
introduce unexpected results due to for instance higher bit values not
being correctly cleared/set.

As part of this change, make __mk_vma_flags() a custom function so we can
handle specifying invalid VMA bits.  This is purposeful so we can have the
VMA tests work at lower and higher number of VMA flags without having to
duplicate code too much.

Link: https://lkml.kernel.org/r/7fe6afe9c8c61e4d3cfc9a2d50a5d24da8528e68.1769097829.git.lorenzo.stoakes@oracle.com
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Damien Le Moal <dlemoal@kernel.org>
Cc: "Darrick J. Wong" <djwong@kernel.org>
Cc: Jarkko Sakkinen <jarkko@kernel.org>
Cc: Yury Norov <ynorov@nvidia.com>
Cc: Chris Mason <clm@fb.com>
Cc: Pedro Falcato <pfalcato@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Lorenzo Stoakes
2026-01-22 16:06:22 +00:00
committed by Andrew Morton
parent a1f0dacaab
commit f615cc9264
5 changed files with 322 additions and 12 deletions
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16
tools/testing/vma/include/custom.h
View File

@@ -101,3 +101,19 @@ static inline void vma_lock_init(struct vm_area_struct *vma, bool reset_refcnt)
if (reset_refcnt)
refcount_set(&vma->vm_refcnt, 0);
}
static inline vma_flags_t __mk_vma_flags(size_t count, const vma_flag_t *bits)
{
vma_flags_t flags;
int i;
/*
* For testing purposes: allow invalid bit specification so we can
* easily test.
*/
vma_flags_clear_all(&flags);
for (i = 0; i < count; i++)
if (bits[i] < NUM_VMA_FLAG_BITS)
vma_flag_set(&flags, bits[i]);
return flags;
}