diff options
| author |   Eric W. Biederman <ebiederm@xmission.com> | 2005-06-25 14:57:41 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-25 16:24:46 -0700 |
| commit | 9635b47d910223745258768418003580ef7dba17 (patch) | |
| tree | b61adfddad3bf3069c9fa379b34805420b4ef85c /arch/i386 | |
| parent | [PATCH] kexec: x86: rename APIC_MODE_EXINT (diff) | |
| download | linux-dev-9635b47d910223745258768418003580ef7dba17.tar.xz linux-dev-9635b47d910223745258768418003580ef7dba17.zip | |
[PATCH] kexec: x86: local apic fix
From: "Maciej W. Rozycki" <macro@linux-mips.org>
Fix a kexec problem whcih causes local APIC detection failure.
The problem is detect_init_APIC() is called early, before the command line
have been processed. Therefore "lapic" (and "nolapic") have not been seen,
yet.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386')
| -rw-r--r-- | arch/i386/kernel/apic.c | 25 | ||||
| -rw-r--r-- | arch/i386/kernel/setup.c | 11 |
2 files changed, 16 insertions, 20 deletions
diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c index b905d7bb9a0d..cf45bed96d08 100644 --- a/arch/i386/kernel/apic.c +++ b/arch/i386/kernel/apic.c @@ -41,6 +41,11 @@ #include "io_ports.h" /* + * Knob to control our willingness to enable the local APIC. + */ +int enable_local_apic __initdata = 0; /* -1=force-disable, +1=force-enable */ + +/* * Debug level */ int apic_verbosity; @@ -666,26 +671,6 @@ static void apic_pm_activate(void) { } * Original code written by Keir Fraser. */ -/* - * Knob to control our willingness to enable the local APIC. - */ -int enable_local_apic __initdata = 0; /* -1=force-disable, +1=force-enable */ - -static int __init lapic_disable(char *str) -{ - enable_local_apic = -1; - clear_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability); - return 0; -} -__setup("nolapic", lapic_disable); - -static int __init lapic_enable(char *str) -{ - enable_local_apic = 1; - return 0; -} -__setup("lapic", lapic_enable); - static int __init apic_set_verbosity(char *str) { if (strcmp("debug", str) == 0) diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c index cba67e4ba0af..f1ad9fdeaad8 100644 --- a/arch/i386/kernel/setup.c +++ b/arch/i386/kernel/setup.c @@ -44,6 +44,7 @@ #include <linux/edd.h> #include <linux/nodemask.h> #include <video/edid.h> +#include <asm/apic.h> #include <asm/e820.h> #include <asm/mpspec.h> #include <asm/setup.h> @@ -835,6 +836,16 @@ static void __init parse_cmdline_early (char ** cmdline_p) #endif /* CONFIG_X86_LOCAL_APIC */ #endif /* CONFIG_ACPI_BOOT */ +#ifdef CONFIG_X86_LOCAL_APIC + /* enable local APIC */ + else if (!memcmp(from, "lapic", 5)) + lapic_enable(); + + /* disable local APIC */ + else if (!memcmp(from, "nolapic", 6)) + lapic_disable(); +#endif /* CONFIG_X86_LOCAL_APIC */ + /* * highmem=size forces highmem to be exactly 'size' bytes. * This works even on boxes that have no highmem otherwise. |