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ARC: Fix thread_saved_pc()

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The old implementation assumed that SP at the time of __switch_to() is
right above pt_regs which is almost certainly not the case as there will
be some stack build up between entry into kernel and leading up to
__switch_to

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta
2015-02-27 10:59:31 +05:30
parent 13648b0118
commit 3240dd57e5
2 changed files with 2 additions and 26 deletions
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5
arch/arc/include/asm/processor.h
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@@ -47,9 +47,6 @@ struct thread_struct {
/* Forward declaration, a strange C thing */
struct task_struct;
/* Return saved PC of a blocked thread */
unsigned long thread_saved_pc(struct task_struct *t);
#define task_pt_regs(p) \
((struct pt_regs *)(THREAD_SIZE + (void *)task_stack_page(p)) - 1)
@@ -86,6 +83,8 @@ unsigned long thread_saved_pc(struct task_struct *t);
#define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4)
#define TSK_K_FP(tsk) TSK_K_REG(tsk, 0)
#define thread_saved_pc(tsk) TSK_K_BLINK(tsk)
extern void start_thread(struct pt_regs * regs, unsigned long pc,
unsigned long usp);