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Merge branch 'x86-trampoline-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'x86-trampoline-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86-32, mm: Add an initial page table for core bootstrapping
This commit is contained in:
Linus Torvalds 2010-10-22 20:37:50 -07:00
commit 10f2a2b0f6
11 changed files with 58 additions and 121 deletions
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20
arch/x86/kernel/smpboot.c
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@ -299,22 +299,16 @@ notrace static void __cpuinit start_secondary(void *unused)
* fragile that we want to limit the things done here to the
* most necessary things.
*/
#ifdef CONFIG_X86_32
/*
* Switch away from the trampoline page-table
*
* Do this before cpu_init() because it needs to access per-cpu
* data which may not be mapped in the trampoline page-table.
*/
load_cr3(swapper_pg_dir);
__flush_tlb_all();
#endif
cpu_init();
preempt_disable();
smp_callin();
#ifdef CONFIG_X86_32
/* switch away from the initial page table */
load_cr3(swapper_pg_dir);
__flush_tlb_all();
#endif
/* otherwise gcc will move up smp_processor_id before the cpu_init */
barrier();
/*
@ -785,7 +779,6 @@ do_rest:
#ifdef CONFIG_X86_32
/* Stack for startup_32 can be just as for start_secondary onwards */
irq_ctx_init(cpu);
initial_page_table = __pa(&trampoline_pg_dir);
#else
clear_tsk_thread_flag(c_idle.idle, TIF_FORK);
initial_gs = per_cpu_offset(cpu);
@ -934,7 +927,6 @@ int __cpuinit native_cpu_up(unsigned int cpu)
per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
err = do_boot_cpu(apicid, cpu);
if (err) {
pr_debug("do_boot_cpu failed %d\n", err);
return -EIO;