From 319904ad40d413a0e721ed35fcb2374657db6aaa Mon Sep 17 00:00:00 2001 From: Huang Ying Date: Thu, 28 Jul 2016 15:48:03 -0700 Subject: [PATCH] mm, THP: clean up return value of madvise_free_huge_pmd The definition of return value of madvise_free_huge_pmd is not clear before. According to the suggestion of Minchan Kim, change the type of return value to bool and return true if we do MADV_FREE successfully on entire pmd page, otherwise, return false. Comments are added too. Link: http://lkml.kernel.org/r/1467135452-16688-2-git-send-email-ying.huang@intel.com Signed-off-by: "Huang, Ying" Acked-by: Minchan Kim Cc: "Kirill A. Shutemov" Cc: Jerome Marchand Cc: Vlastimil Babka Cc: Dan Williams Cc: Mel Gorman Cc: Andrea Arcangeli Cc: Ebru Akagunduz Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/huge_mm.h | 2 +- mm/huge_memory.c | 15 ++++++++------- 2 files changed, 9 insertions(+), 8 deletions(-) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 92ce91c03cd0..6f14de45b5ce 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -11,7 +11,7 @@ extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmd, unsigned int flags); -extern int madvise_free_huge_pmd(struct mmu_gather *tlb, +extern bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, unsigned long next); extern int zap_huge_pmd(struct mmu_gather *tlb, diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 121a7f808216..8f0cd35345dc 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1249,25 +1249,26 @@ out: return 0; } -int madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, +/* + * Return true if we do MADV_FREE successfully on entire pmd page. + * Otherwise, return false. + */ +bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, unsigned long next) - { spinlock_t *ptl; pmd_t orig_pmd; struct page *page; struct mm_struct *mm = tlb->mm; - int ret = 0; + bool ret = false; ptl = pmd_trans_huge_lock(pmd, vma); if (!ptl) goto out_unlocked; orig_pmd = *pmd; - if (is_huge_zero_pmd(orig_pmd)) { - ret = 1; + if (is_huge_zero_pmd(orig_pmd)) goto out; - } page = pmd_page(orig_pmd); /* @@ -1309,7 +1310,7 @@ int madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, set_pmd_at(mm, addr, pmd, orig_pmd); tlb_remove_pmd_tlb_entry(tlb, pmd, addr); } - ret = 1; + ret = true; out: spin_unlock(ptl); out_unlocked: -- 2.20.1