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x86: implement atomic text_poke() via fixmap

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Use fixmaps instead of vmap/vunmap in text_poke() for avoiding
page allocation and delayed unmapping.

At the result of above change, text_poke() becomes atomic and can be called
from stop_machine() etc.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
LKML-Reference: <49B14352.2040705@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu
2009-03-06 10:37:54 -05:00
committed by Ingo Molnar
parent 3945dab45a
commit 78ff7fae04
2 changed files with 17 additions and 9 deletions
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2
arch/x86/include/asm/fixmap.h
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@@ -111,6 +111,8 @@ enum fixed_addresses {
#ifdef CONFIG_PARAVIRT
FIX_PARAVIRT_BOOTMAP,
#endif
FIX_TEXT_POKE0, /* reserve 2 pages for text_poke() */
FIX_TEXT_POKE1,
__end_of_permanent_fixed_addresses,
#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
FIX_OHCI1394_BASE,