提交 959b4fdf 编写于 作者: J Jeremy Fitzhardinge 提交者: Andi Kleen

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

Add "noreplace-paravirt" to disable paravirt_ops patching.
Signed-off-by: NJeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: NAndi Kleen <ak@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
上级 752783c0
......@@ -64,6 +64,7 @@ parameter is applicable:
GENERIC_TIME The generic timeofday code is enabled.
NFS Appropriate NFS support is enabled.
OSS OSS sound support is enabled.
PV_OPS A paravirtualized kernel
PARIDE The ParIDE subsystem is enabled.
PARISC The PA-RISC architecture 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
noreplace-paravirt [IA-32,PV_OPS] Don't patch paravirt_ops
noreplace-smp [IA-32,SMP] Don't replace SMP instructions
with UP alternatives
......
......@@ -30,6 +30,16 @@ static int __init setup_noreplace_smp(char *str)
}
__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) \
printk(KERN_DEBUG fmt, args)
......@@ -330,6 +340,9 @@ void apply_paravirt(struct paravirt_patch_site *start,
{
struct paravirt_patch_site *p;
if (noreplace_paravirt)
return;
for (p = start; p < end; p++) {
unsigned int used;
......
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