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| author | Brian Gerst <brgerst@gmail.com> | 2009-01-18 18:38:58 +0300 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2009-01-18 18:38:58 +0300 |
| commit | 3d1e42a7cf945e289d6ba26159aa0e2b0645401b (patch) | |
| tree | 0b020226f5fce3abecf74e6680224ecb96fd18a8 /arch/x86/kernel/process_64.c | |
| parent | 9af45651f1f7c89942e016a1a00a7ebddfa727f8 (diff) | |
| download | linux-3d1e42a7cf945e289d6ba26159aa0e2b0645401b.tar.xz | |
x86-64: Move oldrsp from PDA to per-cpu.
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>
Diffstat (limited to 'arch/x86/kernel/process_64.c')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 6c5f57602108..480128918926 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -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, |