From: H. Peter Anvin <hpa@zytor.com>
Date: Fri, 1 May 2009 00:59:36 +0000 (-0700)
Subject: x86, boot: align the .bss section in the decompressor
X-Git-Tag: v2.6.31-rc1~422^2~26
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=0b4eb462da10f832b28d518abffa4d77805928a0

x86, boot: align the .bss section in the decompressor

Aligning the .bss section makes it trivial to use large operation
sizes for moving the initialized sections and clearing the .bss.
The alignment chosen (L1 cache) is somewhat arbitrary, but should be
large enough to avoid all known performance traps and small enough to
not cause troubles.

[ Impact: trivial performance enhancement, future patch prep	]

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---

diff --git a/arch/x86/boot/compressed/vmlinux.lds.S b/arch/x86/boot/compressed/vmlinux.lds.S
index 0d26c92d3c7d..dbe515e13fef 100644
--- a/arch/x86/boot/compressed/vmlinux.lds.S
+++ b/arch/x86/boot/compressed/vmlinux.lds.S
@@ -42,6 +42,7 @@ SECTIONS
 		*(.data.*)
 		_edata = . ;
 	}
+	. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
 	.bss : {
 		_bss = . ;
 		*(.bss)