linux-kernel - Re: x86_64 has 2 x arch_vma_name()

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Message-Id: <20070725212321.247864D058D@magilla.localdomain>
Date:	Wed, 25 Jul 2007 14:23:21 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Andi Kleen <ak@...e.de>, LKML <linux-kernel@...r.kernel.org>,
	Nathan Lynch <ntl@...ox.com>,
	Andy Whitcroft <apw@...dowen.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: x86_64 has 2 x arch_vma_name() - can we drop one?

Your version should work, but I would do it a little differently.


Thanks,
Roland

---
[PATCH] 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: c633090e3105e779c97d4978e5e3d7d66b291cfb
It was introduced in mm/init.c by: 2aae950b21e4bc789d1fc6668faf67e8748300b7

Signed-off-by: Roland McGrath <roland@...hat.com>
CC: Sam Ravnborg <sam@...nborg.org>
---
 arch/x86_64/ia32/ia32_binfmt.c |    5 +++--
 arch/x86_64/ia32/syscall32.c   |    8 --------
 2 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/arch/x86_64/ia32/ia32_binfmt.c b/arch/x86_64/ia32/ia32_binfmt.c
index b70f3e7..90b37fc 100644
--- a/arch/x86_64/ia32/ia32_binfmt.c
+++ b/arch/x86_64/ia32/ia32_binfmt.c
@@ -41,8 +41,9 @@ int sysctl_vsyscall32 = 1;
 #undef ARCH_DLINFO
 #define ARCH_DLINFO do {  \
 	if (sysctl_vsyscall32) { \
-	NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \
-	NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE);    \
+		current->mm->context.vdso = (void *)VSYSCALL32_BASE;	\
+		NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \
+		NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE);    \
 	}	\
 } while(0)
 
diff --git a/arch/x86_64/ia32/syscall32.c b/arch/x86_64/ia32/syscall32.c
index fc4419f..6df8ec7 100644
--- a/arch/x86_64/ia32/syscall32.c
+++ b/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);
-
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