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x86-64: Move oldrsp from PDA to per-cpu.

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tj: * in asm-offsets_64.c, pda.h inclusion shouldn't be removed as pda
      is still referenced in the file
    * s/oldrsp/old_rsp/

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Brian Gerst
2009-01-19 00:38:58 +09:00
committed by Tejun Heo
parent 9af45651f1
commit 3d1e42a7cf
5 changed files with 15 additions and 14 deletions
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8
arch/x86/kernel/process_64.c
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@@ -60,6 +60,8 @@ asmlinkage extern void ret_from_fork(void);
DEFINE_PER_CPU(struct task_struct *, current_task) = &init_task;
EXPORT_PER_CPU_SYMBOL(current_task);
DEFINE_PER_CPU(unsigned long, old_rsp);
unsigned long kernel_thread_flags = CLONE_VM | CLONE_UNTRACED;
static ATOMIC_NOTIFIER_HEAD(idle_notifier);
@@ -395,7 +397,7 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
load_gs_index(0);
regs->ip = new_ip;
regs->sp = new_sp;
write_pda(oldrsp, new_sp);
percpu_write(old_rsp, new_sp);
regs->cs = __USER_CS;
regs->ss = __USER_DS;
regs->flags = 0x200;
@@ -616,8 +618,8 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
/*
* Switch the PDA and FPU contexts.
*/
prev->usersp = read_pda(oldrsp);
write_pda(oldrsp, next->usersp);
prev->usersp = percpu_read(old_rsp);
percpu_write(old_rsp, next->usersp);
percpu_write(current_task, next_p);
percpu_write(kernel_stack,