linux-kernel - [patch v2] mm, thp: print useful information when mmap_sem is unlocked in zap_pmd

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Message-ID: <alpine.DEB.2.00.1206110214150.6843@chino.kir.corp.google.com>
Date:	Mon, 11 Jun 2012 02:15:30 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrea Arcangeli <aarcange@...hat.com>,
	Sasha Levin <levinsasha928@...il.com>
Subject: [patch v2] mm, thp: print useful information when mmap_sem is unlocked
 in zap_pmd_range

Andrea asked for addr, end, vma->vm_start, and vma->vm_end to be emitted
when !rwsem_is_locked(&tlb->mm->mmap_sem).  Otherwise, debugging the
underlying issue is more difficult.

Suggested-by: Andrea Arcangeli <aarcange@...hat.com>
Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 v2: print in hex rather than decimal

 mm/memory.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/mm/memory.c b/mm/memory.c
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1225,7 +1225,15 @@ static inline unsigned long zap_pmd_range(struct mmu_gather *tlb,
 		next = pmd_addr_end(addr, end);
 		if (pmd_trans_huge(*pmd)) {
 			if (next - addr != HPAGE_PMD_SIZE) {
-				VM_BUG_ON(!rwsem_is_locked(&tlb->mm->mmap_sem));
+#ifdef CONFIG_DEBUG_VM
+				if (!rwsem_is_locked(&tlb->mm->mmap_sem)) {
+					pr_err("%s: mmap_sem is unlocked! addr=0x%lx end=0x%lx vma->vm_start=0x%lx vma->vm_end=0x%lx\n",
+						__func__, addr, end,
+						vma->vm_start,
+						vma->vm_end);
+					BUG();
+				}
+#endif
 				split_huge_page_pmd(vma->vm_mm, pmd);
 			} else if (zap_huge_pmd(tlb, vma, pmd, addr))
 				goto next;
--
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