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x86: make pda a percpu variable

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[ 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>
This commit is contained in:
Tejun Heo
2009-01-13 20:41:35 +09:00
committed by Ingo Molnar
parent 9939ddaff5
commit b12d8db8fb
6 changed files with 23 additions and 20 deletions
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10
arch/x86/kernel/head64.c
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@ -26,18 +26,8 @@
#include <asm/bios_ebda.h>
#include <asm/trampoline.h>
#ifndef CONFIG_SMP
/* boot cpu pda, referenced by head_64.S to initialize %gs on UP */
struct x8664_pda _boot_cpu_pda;
#endif
void __init x86_64_init_pda(void)
{
#ifdef CONFIG_SMP
cpu_pda(0) = (void *)__per_cpu_load;
#else
cpu_pda(0) = &_boot_cpu_pda;
#endif
pda_init(0);
}