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mm: update ptep_modify_prot_start/commit to take vm_area_struct as arg

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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:
Aneesh Kumar K.V
2019-03-05 15:46:26 -08:00
committed by Linus Torvalds
parent 8bb4e7a2ee
commit 0cbe3e26ab
10 changed files with 35 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
fs/proc/task_mmu.c
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@@ -948,10 +948,10 @@ static inline void clear_soft_dirty(struct vm_area_struct *vma,
pte_t ptent = *pte;
if (pte_present(ptent)) {
ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte);
ptent = ptep_modify_prot_start(vma, addr, pte);
ptent = pte_wrprotect(ptent);
ptent = pte_clear_soft_dirty(ptent);
ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent);
ptep_modify_prot_commit(vma, addr, pte, ptent);
} else if (is_swap_pte(ptent)) {
ptent = pte_swp_clear_soft_dirty(ptent);
set_pte_at(vma->vm_mm, addr, pte, ptent);