Commit5b7abea

kiryl

authored and

torvalds

committed

thp: fix MADV_DONTNEED vs clear soft dirty race

Yet another instance of the same race.Fix is identical to change_huge_pmd().See "thp: fix MADV_DONTNEED vs. numa balancing race" for more details.Link:http://lkml.kernel.org/r/20170302151034.27829-5-kirill.shutemov@linux.intel.comSigned-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>Cc: Andrea Arcangeli <aarcange@redhat.com>Cc: Hillf Danton <hillf.zj@alibaba-inc.com>Cc: <stable@vger.kernel.org>Signed-off-by: Andrew Morton <akpm@linux-foundation.org>Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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fs/proc
- task_mmu.c

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`‎fs/proc/task_mmu.c‎`

Lines changed: 8 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -900,7 +900,14 @@ static inline void clear_soft_dirty(struct vm_area_struct *vma,`
`900`	`900`	`staticinlinevoidclear_soft_dirty_pmd(structvm_area_struct*vma,`
`901`	`901`	`unsigned longaddr,pmd_t*pmdp)`
`902`	`902`	`{`
`903`		`-pmd_tpmd=pmdp_huge_get_and_clear(vma->vm_mm,addr,pmdp);`
	`903`	`+pmd_tpmd=*pmdp;`
	`904`	`+`
	`905`	`+/* See comment in change_huge_pmd() */`
	`906`	`+pmdp_invalidate(vma,addr,pmdp);`
	`907`	`+if (pmd_dirty(*pmdp))`
	`908`	`+pmd=pmd_mkdirty(pmd);`
	`909`	`+if (pmd_young(*pmdp))`
	`910`	`+pmd=pmd_mkyoung(pmd);`
`904`	`911`
`905`	`912`	`pmd=pmd_wrprotect(pmd);`
`906`	`913`	`pmd=pmd_clear_soft_dirty(pmd);`

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Commit5b7abea

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`‎fs/proc/task_mmu.c‎`

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