linux-kernel - [PATCH 7/11] x86_64 ia32 vDSO: define arch_vma

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Message-Id: <20070114053601.34F4B1800E5@magilla.sf.frob.com>
Date:	Sat, 13 Jan 2007 21:36:01 -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 7/11] 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@...hat.com>
---
 arch/x86_64/ia32/syscall32.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/x86_64/ia32/syscall32.c b/arch/x86_64/ia32/syscall32.c
index 3ac9355..59f1fa1 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_b
 	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); 
-
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