The patch titled
Subject: mm: replace pmd_write with pmd_access_permitted in fault + gup paths
has been removed from the -mm tree. Its filename was
mm-replace-pmd_write-with-pmd_access_permitted-in-fault-gup-paths.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: mm: replace pmd_write with pmd_access_permitted in fault + gup paths
The 'access_permitted' helper is used in the gup-fast path and goes beyond
the simple _PAGE_RW check to also:
* validate that the mapping is writable from a protection keys
standpoint
* validate that the pte has _PAGE_USER set since all fault paths where
pmd_write is must be referencing user-memory.
Link: http://lkml.kernel.org/r/151043111049.2842.15241454964150083466.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: "Jérôme Glisse" <jglisse@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/sparc/mm/gup.c | 2 +-
fs/dax.c | 3 ++-
mm/hmm.c | 4 ++--
mm/huge_memory.c | 4 ++--
mm/memory.c | 2 +-
5 files changed, 8 insertions(+), 7 deletions(-)
diff -puN arch/sparc/mm/gup.c~mm-replace-pmd_write-with-pmd_access_permitted-in-fault-gup-paths arch/sparc/mm/gup.c
--- a/arch/sparc/mm/gup.c~mm-replace-pmd_write-with-pmd_access_permitted-in-fault-gup-paths
+++ a/arch/sparc/mm/gup.c
@@ -75,7 +75,7 @@ static int gup_huge_pmd(pmd_t *pmdp, pmd
if (!(pmd_val(pmd) & _PAGE_VALID))
return 0;
- if (write && !pmd_write(pmd))
+ if (!pmd_access_permitted(pmd, write))
return 0;
refs = 0;
diff -puN fs/dax.c~mm-replace-pmd_write-with-pmd_access_permitted-in-fault-gup-paths fs/dax.c
--- a/fs/dax.c~mm-replace-pmd_write-with-pmd_access_permitted-in-fault-gup-paths
+++ a/fs/dax.c
@@ -627,7 +627,8 @@ static void dax_mapping_entry_mkclean(st
if (pfn != pmd_pfn(*pmdp))
goto unlock_pmd;
- if (!pmd_dirty(*pmdp) && !pmd_write(*pmdp))
+ if (!pmd_dirty(*pmdp)
+ && !pmd_access_permitted(*pmdp, WRITE))
goto unlock_pmd;
flush_cache_page(vma, address, pfn);
diff -puN mm/hmm.c~mm-replace-pmd_write-with-pmd_access_permitted-in-fault-gup-paths mm/hmm.c
--- a/mm/hmm.c~mm-replace-pmd_write-with-pmd_access_permitted-in-fault-gup-paths
+++ a/mm/hmm.c
@@ -391,11 +391,11 @@ again:
if (pmd_protnone(pmd))
return hmm_vma_walk_clear(start, end, walk);
- if (write_fault && !pmd_write(pmd))
+ if (!pmd_access_permitted(pmd, write_fault))
return hmm_vma_walk_clear(start, end, walk);
pfn = pmd_pfn(pmd) + pte_index(addr);
- flag |= pmd_write(pmd) ? HMM_PFN_WRITE : 0;
+ flag |= pmd_access_permitted(pmd, WRITE) ? HMM_PFN_WRITE : 0;
for (; addr < end; addr += PAGE_SIZE, i++, pfn++)
pfns[i] = hmm_pfn_t_from_pfn(pfn) | flag;
return 0;
diff -puN mm/huge_memory.c~mm-replace-pmd_write-with-pmd_access_permitted-in-fault-gup-paths mm/huge_memory.c
--- a/mm/huge_memory.c~mm-replace-pmd_write-with-pmd_access_permitted-in-fault-gup-paths
+++ a/mm/huge_memory.c
@@ -877,7 +877,7 @@ struct page *follow_devmap_pmd(struct vm
*/
WARN_ONCE(flags & FOLL_COW, "mm: In follow_devmap_pmd with FOLL_COW set");
- if (flags & FOLL_WRITE && !pmd_write(*pmd))
+ if (!pmd_access_permitted(*pmd, flags & FOLL_WRITE))
return NULL;
if (pmd_present(*pmd) && pmd_devmap(*pmd))
@@ -1393,7 +1393,7 @@ out_unlock:
*/
static inline bool can_follow_write_pmd(pmd_t pmd, unsigned int flags)
{
- return pmd_write(pmd) ||
+ return pmd_access_permitted(pmd, WRITE) ||
((flags & FOLL_FORCE) && (flags & FOLL_COW) && pmd_dirty(pmd));
}
diff -puN mm/memory.c~mm-replace-pmd_write-with-pmd_access_permitted-in-fault-gup-paths mm/memory.c
--- a/mm/memory.c~mm-replace-pmd_write-with-pmd_access_permitted-in-fault-gup-paths
+++ a/mm/memory.c
@@ -4046,7 +4046,7 @@ static int __handle_mm_fault(struct vm_a
if (pmd_protnone(orig_pmd) && vma_is_accessible(vma))
return do_huge_pmd_numa_page(&vmf, orig_pmd);
- if (dirty && !pmd_write(orig_pmd)) {
+ if (dirty && !pmd_access_permitted(orig_pmd, WRITE)) {
ret = wp_huge_pmd(&vmf, orig_pmd);
if (!(ret & VM_FAULT_FALLBACK))
return ret;
_
Patches currently in -mm which might be from dan.j.williams@xxxxxxxxx are
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