diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2015-01-15 21:22:22 +0000 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-01-22 15:10:55 +0100 |
| commit | 12e189d3cfa4c64de758bde18626184bf32c65fc (patch) | |
| tree | cdfe176972518a498d1b868ad95242a69d415eb4 | |
| parent | 62e61633daeb0b53f0506aa6e170e2e4cc75cd65 (diff) | |
x86/x2apic: Add proper state tracking
Having 3 different variables to track the state is just silly and
error prone. Add a proper state tracking variable which covers the
three possible states: ON/OFF/DISABLED.
We cannot use x2apic_mode for this as this would require to change all
users of x2apic_mode with explicit comparisons for a state value
instead of treating it as boolean.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Borislav Petkov <bp@alien8.de>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Tony Luck <tony.luck@intel.com>
Link: http://lkml.kernel.org/r/20150115211702.955392443@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 06b75216d171..b374b0de342b 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1480,6 +1480,14 @@ static bool nox2apic __initdata; #ifdef CONFIG_X86_X2APIC int x2apic_mode; static int x2apic_disabled; + +enum { + X2APIC_OFF, + X2APIC_ON, + X2APIC_DISABLED, +}; +static int x2apic_state; + static int __init setup_nox2apic(char *str) { if (x2apic_enabled()) { @@ -1496,7 +1504,7 @@ static int __init setup_nox2apic(char *str) setup_clear_cpu_cap(X86_FEATURE_X2APIC); nox2apic = true; - + x2apic_state = X2APIC_DISABLED; return 0; } early_param("nox2apic", setup_nox2apic); @@ -1539,6 +1547,7 @@ static __init void disable_x2apic(void) } x2apic_disabled = 1; + x2apic_state = X2APIC_DISABLED; } void enable_x2apic(void) @@ -1559,6 +1568,7 @@ void enable_x2apic(void) printk_once(KERN_INFO "Enabling x2apic\n"); wrmsrl(MSR_IA32_APICBASE, msr | X2APIC_ENABLE); } + x2apic_state = X2APIC_ON; } static __init void try_to_enable_x2apic(int remap_mode) @@ -1597,6 +1607,9 @@ void __init check_x2apic(void) if (x2apic_enabled()) { pr_info("x2apic: enabled by BIOS, switching to x2apic ops\n"); x2apic_mode = 1; + x2apic_state = X2APIC_ON; + } else if (!cpu_has_x2apic) { + x2apic_state = X2APIC_DISABLED; } } #else /* CONFIG_X86_X2APIC */ |