The patch titled
Subject: powerpc-mm-use-generic-version-of-pmdp_clear_flush-v5
has been added to the -mm tree. Its filename is
powerpc-mm-use-generic-version-of-pmdp_clear_flush-v5.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/powerpc-mm-use-generic-version-of-pmdp_clear_flush-v5.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/powerpc-mm-use-generic-version-of-pmdp_clear_flush-v5.patch
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------------------------------------------------------
From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Subject: powerpc-mm-use-generic-version-of-pmdp_clear_flush-v5
Fix VM_BUG_ON on x86.
The default implementation of pmdp_collapse_flush used the hugepage
variant and hence can be called on pmd_t pointing to pgtable. This
resulting in us hitting VM_BUG_ON in pmdp_clear_flush. Update powerpc/mm:
Use generic version of pmdp_clear_flush to handle this.
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/s390/include/asm/pgtable.h | 8 ++++++++
include/asm-generic/pgtable.h | 7 ++++++-
2 files changed, 14 insertions(+), 1 deletion(-)
diff -puN arch/s390/include/asm/pgtable.h~powerpc-mm-use-generic-version-of-pmdp_clear_flush-v5 arch/s390/include/asm/pgtable.h
--- a/arch/s390/include/asm/pgtable.h~powerpc-mm-use-generic-version-of-pmdp_clear_flush-v5
+++ a/arch/s390/include/asm/pgtable.h
@@ -1548,6 +1548,14 @@ static inline void pmdp_set_wrprotect(st
}
}
+static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
+ unsigned long address,
+ pmd_t *pmdp)
+{
+ return pmdp_get_and_clear(vma->vm_mm, address, pmdp);
+}
+#define pmdp_collapse_flush pmdp_collapse_flush
+
#define pfn_pmd(pfn, pgprot) mk_pmd_phys(__pa((pfn) << PAGE_SHIFT), (pgprot))
#define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
diff -puN include/asm-generic/pgtable.h~powerpc-mm-use-generic-version-of-pmdp_clear_flush-v5 include/asm-generic/pgtable.h
--- a/include/asm-generic/pgtable.h~powerpc-mm-use-generic-version-of-pmdp_clear_flush-v5
+++ a/include/asm-generic/pgtable.h
@@ -195,7 +195,12 @@ static inline pmd_t pmdp_collapse_flush(
unsigned long address,
pmd_t *pmdp)
{
- return pmdp_clear_flush(vma, address, pmdp);
+ pmd_t pmd;
+ VM_BUG_ON(address & ~HPAGE_PMD_MASK);
+ VM_BUG_ON(pmd_trans_huge(*pmdp));
+ pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
+ flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+ return pmd;
}
#define pmdp_collapse_flush pmdp_collapse_flush
#else
_
Patches currently in -mm which might be from aneesh.kumar@xxxxxxxxxxxxxxxxxx are
origin.patch
tracing-mm-dont-trace-kmem_cache_free-on-offline-cpus.patch
mm-hugetlb-reduce-arch-dependent-code-about-huge_pmd_unshare.patch
mm-thp-split-out-pmd-collpase-flush-into-a-separate-functions.patch
mm-thp-split-out-pmd-collpase-flush-into-a-separate-functions-fix.patch
mm-thp-split-out-pmd-collpase-flush-into-a-separate-functions-fix-2.patch
powerpc-mm-use-generic-version-of-pmdp_clear_flush.patch
powerpc-mm-use-generic-version-of-pmdp_clear_flush-v5.patch
mm-clarify-that-the-function-operateds-on-hugepage-pte.patch
mm-clarify-that-the-function-operates-on-hugepage-pte-v5.patch
page-flags-trivial-cleanup-for-pagetrans-helpers.patch
page-flags-introduce-page-flags-policies-wrt-compound-pages.patch
page-flags-define-pg_locked-behavior-on-compound-pages.patch
page-flags-define-behavior-of-fs-io-related-flags-on-compound-pages.patch
page-flags-define-behavior-of-lru-related-flags-on-compound-pages.patch
page-flags-define-behavior-slb-related-flags-on-compound-pages.patch
page-flags-define-behavior-of-xen-related-flags-on-compound-pages.patch
page-flags-define-pg_reserved-behavior-on-compound-pages.patch
page-flags-define-pg_swapbacked-behavior-on-compound-pages.patch
page-flags-define-pg_swapcache-behavior-on-compound-pages.patch
page-flags-define-pg_mlocked-behavior-on-compound-pages.patch
page-flags-define-pg_uncached-behavior-on-compound-pages.patch
page-flags-define-pg_uptodate-behavior-on-compound-pages.patch
page-flags-look-on-head-page-if-the-flag-is-encoded-in-page-mapping.patch
mm-sanitize-page-mapping-for-tail-pages.patch
linux-next.patch
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