From 0b4eb462da10f832b28d518abffa4d77805928a0 Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Thu, 30 Apr 2009 17:59:36 -0700
Subject: [PATCH] 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>
---
arch/x86/boot/compressed/vmlinux.lds.S | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/boot/compressed/vmlinux.lds.S b/arch/x86/boot/compressed/vmlinux.lds.S
index 0d26c92d3c7d0..dbe515e13fef2 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)
--
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