From e5b97dde514f9bd43f9e525451d0a863c4fc8a9a Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@redhat.com>
Date: Fri, 26 Jan 2007 00:56:48 -0800
Subject: [PATCH] Add VM_ALWAYSDUMP

This patch adds the VM_ALWAYSDUMP flag for vm_flags in vm_area_struct.  This
provides a clean explicit way to have a vma always included in core dumps, as
is needed for vDSO's.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 fs/binfmt_elf.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'fs/binfmt_elf.c')

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 7cb28720f90..6fec8bfa6ba 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1178,6 +1178,10 @@ static int dump_seek(struct file *file, loff_t off)
  */
 static int maydump(struct vm_area_struct *vma)
 {
+	/* The vma can be set up to tell us the answer directly.  */
+	if (vma->vm_flags & VM_ALWAYSDUMP)
+		return 1;
+
 	/* Do not dump I/O mapped devices or special mappings */
 	if (vma->vm_flags & (VM_IO | VM_RESERVED))
 		return 0;
-- 
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