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| author | Max Filippov <jcmvbkbc@gmail.com> | 2013-08-26 13:16:23 +0200 |
|---|---|---|
| committer | Chris Zankel <chris@zankel.net> | 2013-09-06 18:46:49 +0200 |
| commit | 16c5becf39a2d174f08b46504f522c2fa50ef462 (patch) | |
| tree | d69f250d7f77b6d3bc0530186cf37f0ca28afb20 /arch | |
| parent | xtensa: check thread flags atomically on return from user exception (diff) | |
| download | linux-16c5becf39a2d174f08b46504f522c2fa50ef462.tar.xz linux-16c5becf39a2d174f08b46504f522c2fa50ef462.zip | |
xtensa: enable kernel preemption
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 45 |
1 files changed, 17 insertions, 28 deletions
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index 03709ef2f3ce..3f3de283d707 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -31,7 +31,6 @@ /* Unimplemented features. */ #undef KERNEL_STACK_OVERFLOW_CHECK -#undef PREEMPTIBLE_KERNEL #undef ALLOCA_EXCEPTION_IN_IRAM /* Not well tested. @@ -429,7 +428,9 @@ common_exception_return: /* Jump if we are returning from kernel exceptions. */ l32i a3, a1, PT_PS - _bbci.l a3, PS_UM_BIT, 4f + GET_THREAD_INFO(a2, a1) + l32i a4, a2, TI_FLAGS + _bbci.l a3, PS_UM_BIT, 6f /* Specific to a user exception exit: * We need to check some flags for signal handling and rescheduling, @@ -438,9 +439,6 @@ common_exception_return: * Note that we don't disable interrupts here. */ - GET_THREAD_INFO(a2,a1) - l32i a4, a2, TI_FLAGS - _bbsi.l a4, TIF_NEED_RESCHED, 3f _bbsi.l a4, TIF_NOTIFY_RESUME, 2f _bbci.l a4, TIF_SIGPENDING, 5f @@ -463,6 +461,19 @@ common_exception_return: callx4 a4 j 1b +#ifdef CONFIG_PREEMPT +6: + _bbci.l a4, TIF_NEED_RESCHED, 4f + + /* Check current_thread_info->preempt_count */ + + l32i a4, a2, TI_PRE_COUNT + bnez a4, 4f + movi a4, preempt_schedule_irq + callx4 a4 + j 1b +#endif + 5: #ifdef CONFIG_DEBUG_TLB_SANITY l32i a4, a1, PT_DEPC @@ -470,6 +481,7 @@ common_exception_return: movi a4, check_tlb_sanity callx4 a4 #endif +6: 4: #ifdef CONFIG_TRACE_IRQFLAGS l32i a4, a1, PT_DEPC @@ -573,29 +585,6 @@ user_exception_exit: kernel_exception_exit: -#ifdef PREEMPTIBLE_KERNEL - -#ifdef CONFIG_PREEMPT - - /* - * Note: We've just returned from a call4, so we have - * at least 4 addt'l regs. - */ - - /* Check current_thread_info->preempt_count */ - - GET_THREAD_INFO(a2) - l32i a3, a2, TI_PREEMPT - bnez a3, 1f - - l32i a2, a2, TI_FLAGS - -1: - -#endif - -#endif - /* Check if we have to do a movsp. * * We only have to do a movsp if the previous window-frame has |