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mm: update ptep_modify_prot_start/commit to take vm_area_struct as arg
Patch series "NestMMU pte upgrade workaround for mprotect", v5.
We can upgrade pte access (R -> RW transition) via mprotect. We need to
make sure we follow the recommended pte update sequence as outlined in
commit bd5050e38a
("powerpc/mm/radix: Change pte relax sequence to
handle nest MMU hang") for such updates. This patch series does that.
This patch (of 5):
Some architectures may want to call flush_tlb_range from these helpers.
Link: http://lkml.kernel.org/r/20190116085035.29729-2-aneesh.kumar@linux.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
committed by
Linus Torvalds
parent
8bb4e7a2ee
commit
0cbe3e26ab
@@ -110,7 +110,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
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continue;
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}
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ptent = ptep_modify_prot_start(mm, addr, pte);
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ptent = ptep_modify_prot_start(vma, addr, pte);
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ptent = pte_modify(ptent, newprot);
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if (preserve_write)
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ptent = pte_mk_savedwrite(ptent);
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@@ -121,7 +121,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
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!(vma->vm_flags & VM_SOFTDIRTY))) {
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ptent = pte_mkwrite(ptent);
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}
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ptep_modify_prot_commit(mm, addr, pte, ptent);
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ptep_modify_prot_commit(vma, addr, pte, ptent);
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pages++;
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} else if (IS_ENABLED(CONFIG_MIGRATION)) {
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swp_entry_t entry = pte_to_swp_entry(oldpte);
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