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[PATCH] i386: PARAVIRT: Allow boot-time disable of paravirt_ops patching 

Add "noreplace-paravirt" to disable paravirt_ops patching.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jeremy Fitzhardinge 2007-05-02 19:27:16 +02:00 committed by Andi Kleen
parent 752783c050
commit 959b4fdfe7
2 changed files with 16 additions and 0 deletions
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3
Documentation/kernel-parameters.txt
View File

@ -64,6 +64,7 @@ parameter is applicable:
GENERIC_TIME The generic timeofday code is enabled. GENERIC_TIME The generic timeofday code is enabled.
NFS Appropriate NFS support is enabled. NFS Appropriate NFS support is enabled.
OSS OSS sound support is enabled. OSS OSS sound support is enabled.
PV_OPS A paravirtualized kernel
PARIDE The ParIDE subsystem is enabled. PARIDE The ParIDE subsystem is enabled.
PARISC The PA-RISC architecture is enabled. PARISC The PA-RISC architecture is enabled.
PCI PCI bus support is enabled. PCI PCI bus support is enabled.
@ -1164,6 +1165,8 @@ and is between 256 and 4096 characters. It is defined in the file
nomce [IA-32] Machine Check Exception nomce [IA-32] Machine Check Exception
noreplace-paravirt [IA-32,PV_OPS] Don't patch paravirt_ops
noreplace-smp [IA-32,SMP] Don't replace SMP instructions noreplace-smp [IA-32,SMP] Don't replace SMP instructions
with UP alternatives with UP alternatives

13
arch/i386/kernel/alternative.c
View File

@ -30,6 +30,16 @@ static int __init setup_noreplace_smp(char *str)
} }
__setup("noreplace-smp", setup_noreplace_smp); __setup("noreplace-smp", setup_noreplace_smp);
#ifdef CONFIG_PARAVIRT
static int noreplace_paravirt = 0;
static int __init setup_noreplace_paravirt(char *str)
{
noreplace_paravirt = 1;
return 1;
}
__setup("noreplace-paravirt", setup_noreplace_paravirt);
#endif
#define DPRINTK(fmt, args...) if (debug_alternative) \ #define DPRINTK(fmt, args...) if (debug_alternative) \
printk(KERN_DEBUG fmt, args) printk(KERN_DEBUG fmt, args)
@ -330,6 +340,9 @@ void apply_paravirt(struct paravirt_patch_site *start,
{ {
struct paravirt_patch_site *p; struct paravirt_patch_site *p;
if (noreplace_paravirt)
return;
for (p = start; p < end; p++) { for (p = start; p < end; p++) {
unsigned int used; unsigned int used;