linux-kernel - Re: [REGRESSION] um: CONFIG_STATIC

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Message-ID: <alpine.DEB.1.10.0912212020450.19919@dr-wily.mit.edu>
Date:	Mon, 21 Dec 2009 21:13:18 -0500 (EST)
From:	Tim Abbott <tabbott@...lice.com>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
cc:	linux-kernel@...r.kernel.org, Jeff Dike <jdike@...toit.com>,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: [REGRESSION] um: CONFIG_STATIC_LINK=y broken

On Tue, 22 Dec 2009, richard -rw- weinberger wrote:

> Adding the ALIGN(PAGE_SIZE) causes the segfault.
> But I cannot tell you why. :-(

OK, then the following patch should fix the regression by reverting that 
unintentional change.

Someone should probably determine why the ALIGN causes a segfault, since 
that is probably a bug, but I don't have time to do that investigation.

Richard, can you test that this patch fixes the issue for you?

(adding the UML maintainer and list to the thread).

	-Tim Abbott

um: remove PAGE_SIZE alignment in linker script causing kernel segfault.

The linker script cleanup that I did in commit 
5d150a97f9391f5bcd7ba0d59d7a11c3de3cea80 introduced an ALIGN(PAGE_SIZE) 
when using INIT_TEXT_SECTION; this apparently causes the kernel to 
segfault with CONFIG_STATIC_LINK=y. 

I'm not certain why this would cause the kernel to segfault, but it seems 
likely it is because previously it was the case that

__init_begin = _stext = _text = _sinittext 

and with the extra ALIGN(PAGE_SIZE), _sinittext becomes different.

Signed-off-by: Tim Abbott <tabbott@...lice.com>
Reported-by: richard -rw- weinberger <richard.weinberger@...il.com>
Cc: Jeff Dike <jdike@...toit.com>
Cc: user-mode-linux-devel@...ts.sourceforge.net
---
 arch/um/kernel/uml.lds.S |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/um/kernel/uml.lds.S b/arch/um/kernel/uml.lds.S
index e7a6cca..664f942 100644
--- a/arch/um/kernel/uml.lds.S
+++ b/arch/um/kernel/uml.lds.S
@@ -22,7 +22,7 @@ SECTIONS
   _text = .;
   _stext = .;
   __init_begin = .;
-  INIT_TEXT_SECTION(PAGE_SIZE)
+  INIT_TEXT_SECTION(0)
   . = ALIGN(PAGE_SIZE);

   .text      :
-- 
1.6.5.7
--
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