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| author | Anshuman Khandual <anshuman.khandual@arm.com> | 2021-06-28 19:35:10 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-06-29 10:53:47 -0700 |
| commit | 65ac1a60a57e2c55f2ac37f27095f6b012295e81 (patch) | |
| tree | 63f0072f6fff5ea03eb0f0b5238f82040eec7585 /mm/mmap_lock.c | |
| parent | 85f29cd6a12d430706c39247e7d0207590f581df (diff) | |
| download | linux-65ac1a60a57e2c55f2ac37f27095f6b012295e81.tar.gz linux-65ac1a60a57e2c55f2ac37f27095f6b012295e81.tar.bz2 linux-65ac1a60a57e2c55f2ac37f27095f6b012295e81.zip | |
mm/debug_vm_pgtable: ensure THP availability via has_transparent_hugepage()
On certain platforms, THP support could not just be validated via the
build option CONFIG_TRANSPARENT_HUGEPAGE. Instead
has_transparent_hugepage() also needs to be called upon to verify THP
runtime support. Otherwise the debug test will just run into unusable THP
helpers like in the case of a 4K hash config on powerpc platform [1].
This just moves all pfn_pmd() and pfn_pud() after THP runtime validation
with has_transparent_hugepage() which prevents the mentioned problem.
[1] https://bugzilla.kernel.org/show_bug.cgi?id=213069
Link: https://lkml.kernel.org/r/1621397588-19211-1-git-send-email-anshuman.khandual@arm.com
Fixes: 787d563b8642 ("mm/debug_vm_pgtable: fix kernel crash by checking for THP support")
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mmap_lock.c')
0 files changed, 0 insertions, 0 deletions