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| author | Tejun Heo <tj@kernel.org> | 2009-01-13 20:41:35 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-01-16 14:20:03 +0100 |
| commit | b12d8db8fbfaed1e8222a15333a3645599636854 (patch) | |
| tree | 4ae6ce55232885d0707eb464c5b43a54bdfe3ce4 /arch/x86/kernel/head_64.S | |
| parent | 9939ddaff52787b2a7c1adf1b2afc95421aa0884 (diff) | |
| download | linux-b12d8db8fbfaed1e8222a15333a3645599636854.tar.gz linux-b12d8db8fbfaed1e8222a15333a3645599636854.tar.bz2 linux-b12d8db8fbfaed1e8222a15333a3645599636854.zip | |
x86: make pda a percpu variable
[ Based on original patch from Christoph Lameter and Mike Travis. ]
As pda is now allocated in percpu area, it can easily be made a proper
percpu variable. Make it so by defining per cpu symbol from linker
script and declaring it in C code for SMP and simply defining it for
UP. This change cleans up code and brings SMP and UP closer a bit.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/head_64.S')
| -rw-r--r-- | arch/x86/kernel/head_64.S | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index 7a995d0e9f78..c8ace880661b 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -19,6 +19,7 @@ #include <asm/msr.h> #include <asm/cache.h> #include <asm/processor-flags.h> +#include <asm/percpu.h> #ifdef CONFIG_PARAVIRT #include <asm/asm-offsets.h> @@ -250,7 +251,7 @@ ENTRY(secondary_startup_64) * secondary CPU,initial_gs should be set to its pda address * before the CPU runs this code. * - * On UP, initial_gs points to _boot_cpu_pda and doesn't + * On UP, initial_gs points to PER_CPU_VAR(__pda) and doesn't * change. */ movl $MSR_GS_BASE,%ecx @@ -284,7 +285,7 @@ ENTRY(secondary_startup_64) #ifdef CONFIG_SMP .quad __per_cpu_load #else - .quad _boot_cpu_pda + .quad PER_CPU_VAR(__pda) #endif __FINITDATA |