linux-kernel - [PATCH 6/11] powerpc vDSO: use VM

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Message-Id: <20070114053533.141921800E5@magilla.sf.frob.com>
Date:	Sat, 13 Jan 2007 21:35:33 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Linus Torvalds <torvalds@...l.org>, Andrew Morton <akpm@...l.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 6/11] powerpc vDSO: use VM_ALWAYSDUMP


This patch fixes core dumps to include the vDSO vma, which is left out now.

Signed-off-by: Roland McGrath <roland@...hat.com>
---
 arch/powerpc/kernel/vdso.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index a4b28c7..ae0ede1 100644  
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -284,6 +284,13 @@ int arch_setup_additional_pages(struct l
 	 * pages though
 	 */
 	vma->vm_flags = VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC;
+	/*
+	 * Make sure the vDSO gets into every core dump.
+	 * Dumping its contents makes post-mortem fully interpretable later
+	 * without matching up the same kernel and hardware config to see
+	 * what PC values meant.
+	 */
+	vma->vm_flags |= VM_ALWAYSDUMP;
 	vma->vm_flags |= mm->def_flags;
 	vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
 	vma->vm_ops = &vdso_vmops;
-
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