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openrisc: pass correct arg to schedule_tail 

schedule_tail() requires that the 'prev' task be passed as an argument
to it.  This arg is set in _switch, just before 'returning' to one of
the ret_* functions where schedule_tail is invoked.

Signed-off-by: Jonas Bonn <jonas@southpole.se>
This commit is contained in:
Jonas Bonn 2012-10-14 16:19:52 +02:00
parent ddffeb8c4d
commit 287ad220cd
2 changed files with 7 additions and 3 deletions
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9
arch/openrisc/kernel/entry.S
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@ -1044,8 +1044,13 @@ ENTRY(_switch)
/* Unwind stack to pre-switch state */
l.addi r1,r1,(INT_FRAME_SIZE)
/* Return via the link-register back to where we 'came from', where that can be
* either schedule() or return_from_fork()... */
/* Return via the link-register back to where we 'came from', where
* that may be either schedule(), ret_from_fork(), or
* ret_from_kernel_thread(). If we are returning to a new thread,
* we are expected to have set up the arg to schedule_tail already,
* hence we do so here unconditionally:
*/
l.lwz r3,TI_STACK(r3) /* Load 'prev' as schedule_tail arg */
l.jr r9
l.nop

1
arch/openrisc/kernel/process.c
View File

@ -165,7 +165,6 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
* the kernel stack.
*/
kregs->sp = top_of_kernel_stack;
kregs->gpr[3] = (unsigned long)current; /* arg to schedule_tail */
kregs->gpr[10] = (unsigned long)task_thread_info(p);
kregs->gpr[9] = (unsigned long)ret_from_fork;