x86_64: fix arch_vma_name

The function arch_vma_name() is declared weak and thus it was
not noticed that x86_64 had two almost identical implementations.

It was introduced in syscall32.c by: c633090e
It was introduced in mm/init.c by: 2aae950bSigned-off-by: NRoland McGrath <roland@redhat.com>
Acked-by: NSam Ravnborg <sam@ravnborg.org>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/x86_64/ia32/ia32_binfmt.c

@@ -41,6 +41,7 @@ int sysctl_vsyscall32 = 1;
 #undef ARCH_DLINFO
 #define ARCH_DLINFO do {  \
 	if (sysctl_vsyscall32) { \
+		current->mm->context.vdso = (void *)VSYSCALL32_BASE;	\
 		NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \
 		NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE);    \
 	}	\

arch/x86_64/ia32/syscall32.c

@@ -49,14 +49,6 @@ int syscall32_setup_pages(struct linux_binprm *bprm, int exstack)
 	return ret;
 }
 
-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)
 { 
 	char *syscall32_page = (void *)get_zeroed_page(GFP_KERNEL);