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[PATCH] x86: Work around gcc 4.2 over aggressive optimizer

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The new PDA code uses a dummy _proxy_pda variable to describe
memory references to the PDA. It is never referenced
in inline assembly, but exists as input/output arguments.
gcc 4.2 in some cases can CSE references to this which causes
unresolved symbols.  Define it to zero to avoid this.

Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen 2006-12-09 21:33:36 +01:00 committed by Andi Kleen
parent 92715e282b
commit 1bac3b383a
2 changed files with 2 additions and 0 deletions
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1
arch/i386/kernel/vmlinux.lds.S
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@ -26,6 +26,7 @@ OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
OUTPUT_ARCH(i386)
ENTRY(phys_startup_32)
jiffies = jiffies_64;
_proxy_pda = 0;
PHDRS {
text PT_LOAD FLAGS(5); /* R_E */

1
arch/x86_64/kernel/vmlinux.lds.S
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@ -13,6 +13,7 @@ OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64")
OUTPUT_ARCH(i386:x86-64)
ENTRY(phys_startup_64)
jiffies_64 = jiffies;
_proxy_pda = 0;
PHDRS {
text PT_LOAD FLAGS(5); /* R_E */
data PT_LOAD FLAGS(7); /* RWE */