From: Roland McGrath <roland@redhat.com>
Date: Fri, 26 Jan 2007 08:56:52 +0000 (-0800)
Subject: [PATCH] x86_64 ia32 vDSO: define arch_vma_name
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=c633090e3105e779c97d4978e5e3d7d66b291cfb;p=openwrt%2Fstaging%2Fblogic.git

[PATCH] x86_64 ia32 vDSO: define arch_vma_name

This patch makes x86_64 define arch_vma_name for CONFIG_IA32_EMULATION.  This
makes the ia32 vDSO mapping appear in /proc/PID/maps with "[vdso]" for ia32
processes, as it does on native i386.

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>
---

diff --git a/arch/x86_64/ia32/syscall32.c b/arch/x86_64/ia32/syscall32.c
index 3ac935535e20..59f1fa155915 100644
--- a/arch/x86_64/ia32/syscall32.c
+++ b/arch/x86_64/ia32/syscall32.c
@@ -82,6 +82,14 @@ int syscall32_setup_pages(struct linux_binprm *bprm, int exstack)
 	return 0;
 }
 
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+	if (vma->vm_start == VSYSCALL32_BASE &&
+	    vma->vm_mm && vma->vm_mm->task_size == IA32_PAGE_OFFSET)
+		return "[vdso]";
+	return NULL;
+}
+
 static int __init init_syscall32(void)
 { 
 	syscall32_page = (void *)get_zeroed_page(GFP_KERNEL);