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[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>
This commit is contained in:
Roland McGrath 2007-01-26 00:56:48 -08:00 committed by Linus Torvalds
parent b6558c4a23
commit e5b97dde51
2 changed files with 5 additions and 0 deletions
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4
fs/binfmt_elf.c
View File

@ -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;

1
include/linux/mm.h
View File

@ -168,6 +168,7 @@ extern unsigned int kobjsize(const void *objp);
#define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
#define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */
#define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */
#define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */
#ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS