linux-kernel - [RFC] [PATCH 1/16] x86_64: Align data segment to page size boundary

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Message-ID: <20061113162652.GB17429@in.ibm.com>
Date:	Mon, 13 Nov 2006 11:26:52 -0500
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	linux kernel mailing list <linux-kernel@...r.kernel.org>
Cc:	Reloc Kernel List <fastboot@...ts.osdl.org>, ebiederm@...ssion.com,
	akpm@...l.org, ak@...e.de, hpa@...or.com, magnus.damm@...il.com,
	lwang@...hat.com, dzickus@...hat.com
Subject: [RFC] [PATCH 1/16] x86_64: Align data segment to page size boundary


o Explicitly align data segment to PAGE_SIZE boundary otherwise depending on
  config options and tool chain it might be placed on a non PAGE_SIZE aligned
  boundary and vmlinux loaders like kexec fail when they encounter a 
  PT_LOAD type segment which is not aligned to PAGE_SIZE boundary.

Signed-off-by: Vivek Goyal <vgoyal@...ibm.com>
---

 arch/x86_64/kernel/vmlinux.lds.S |    1 +
 1 file changed, 1 insertion(+)

diff -puN arch/x86_64/kernel/vmlinux.lds.S~x86_64-align-data-segment-to-4K-boundary arch/x86_64/kernel/vmlinux.lds.S
--- linux-2.6.19-rc5-reloc/arch/x86_64/kernel/vmlinux.lds.S~x86_64-align-data-segment-to-4K-boundary	2006-11-09 22:25:15.000000000 -0500
+++ linux-2.6.19-rc5-reloc-root/arch/x86_64/kernel/vmlinux.lds.S	2006-11-09 22:28:24.000000000 -0500
@@ -60,6 +60,7 @@ SECTIONS
   }
 #endif
 
+  . = ALIGN(PAGE_SIZE);        /* Align data segment to page size boundary */
 				/* Data */
   .data : AT(ADDR(.data) - LOAD_OFFSET) {
 	*(.data)
_
-
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