From 3da06ed7366f6749ac333d1c051131c1a550755f Mon Sep 17 00:00:00 2001 From: Akira Takeuchi Date: Tue, 10 Sep 2013 17:20:05 +0100 Subject: [PATCH] mn10300: Fix crash just after starting userspace on !CONFIG_PREEMPT The mn10300 kernel crashes just after starting userspace programs, if CONFIG_PREEMPT is disabled: Freeing unused kernel memory: 96K (90286000 - 9029e000) MISALIGN: 97c33ff9: unsupported instruction f MISALIGN: 97c33ff9: unsupported instruction f MISALIGN: 97c33ff9: unsupported instruction f : This fixes the problem that was introduced by commit d17fc238ac14 ("MN10300: Enable IRQs more in system call exit work path"). Signed-off-by: Akira Takeuchi Signed-off-by: Kiyoshi Owada Signed-off-by: David Howells Signed-off-by: Linus Torvalds --- arch/mn10300/kernel/entry.S | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/mn10300/kernel/entry.S b/arch/mn10300/kernel/entry.S index 222152a3f751..177d61de51c9 100644 --- a/arch/mn10300/kernel/entry.S +++ b/arch/mn10300/kernel/entry.S @@ -171,10 +171,10 @@ ret_from_intr: mov (REG_EPSW,fp),d0 # need to deliver signals before # returning to userspace and EPSW_nSL,d0 - beq resume_kernel # returning to supervisor mode + bne resume_userspace # returning to userspace #ifdef CONFIG_PREEMPT -ENTRY(resume_kernel) +resume_kernel: LOCAL_IRQ_DISABLE mov (TI_preempt_count,a2),d0 # non-zero preempt_count ? cmp 0,d0 @@ -189,6 +189,8 @@ need_resched: bne restore_all call preempt_schedule_irq[],0 jmp need_resched +#else + jmp resume_kernel #endif -- 2.20.1