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| author | Max Filippov <jcmvbkbc@gmail.com> | 2013-08-26 15:12:58 +0400 |
|---|---|---|
| committer | Chris Zankel <chris@zankel.net> | 2013-09-06 09:46:35 -0700 |
| commit | aea8e7c80ab50305257838bfb04f91a76cf9fec7 (patch) | |
| tree | 9fc08e6ec839f35c3f1c27398e6c67ae108594dc /arch/xtensa | |
| parent | 0bc2ba94a65d2cd2ad01004d2d3f94f31c6064bd (diff) | |
| download | talos-obmc-linux-aea8e7c80ab50305257838bfb04f91a76cf9fec7.tar.gz talos-obmc-linux-aea8e7c80ab50305257838bfb04f91a76cf9fec7.zip | |
xtensa: check thread flags atomically on return from user exception
Check pending signals and rescheduling thread flags with interrupts
disabled, and don't enable them if no flags are set. Call
trace_hardirqs_on after thread flags handling, so that rescheduling is
done and hardirqs tracking flag is updated in the correct task context.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'arch/xtensa')
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 39 |
1 files changed, 21 insertions, 18 deletions
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index 9298742f0fd0..03709ef2f3ce 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -423,29 +423,14 @@ common_exception: .global common_exception_return common_exception_return: -#ifdef CONFIG_TRACE_IRQFLAGS - l32i a4, a1, PT_DEPC - /* Double exception means we came here with an exception - * while PS.EXCM was set, i.e. interrupts disabled. - */ - bgeui a4, VALID_DOUBLE_EXCEPTION_ADDRESS, 1f - l32i a4, a1, PT_EXCCAUSE - bnei a4, EXCCAUSE_LEVEL1_INTERRUPT, 1f - /* We came here with an interrupt means interrupts were enabled - * and we'll reenable them on return. - */ - movi a4, trace_hardirqs_on - callx4 a4 1: -#endif + rsil a2, LOCKLEVEL /* Jump if we are returning from kernel exceptions. */ -1: l32i a3, a1, PT_PS + l32i a3, a1, PT_PS _bbci.l a3, PS_UM_BIT, 4f - rsil a2, 0 - /* Specific to a user exception exit: * We need to check some flags for signal handling and rescheduling, * and have to restore WB and WS, extra states, and all registers @@ -465,6 +450,7 @@ common_exception_return: /* Call do_signal() */ + rsil a2, 0 movi a4, do_notify_resume # int do_notify_resume(struct pt_regs*) mov a6, a1 callx4 a4 @@ -472,6 +458,7 @@ common_exception_return: 3: /* Reschedule */ + rsil a2, 0 movi a4, schedule # void schedule (void) callx4 a4 j 1b @@ -483,7 +470,23 @@ common_exception_return: movi a4, check_tlb_sanity callx4 a4 #endif -4: /* Restore optional registers. */ +4: +#ifdef CONFIG_TRACE_IRQFLAGS + l32i a4, a1, PT_DEPC + /* Double exception means we came here with an exception + * while PS.EXCM was set, i.e. interrupts disabled. + */ + bgeui a4, VALID_DOUBLE_EXCEPTION_ADDRESS, 1f + l32i a4, a1, PT_EXCCAUSE + bnei a4, EXCCAUSE_LEVEL1_INTERRUPT, 1f + /* We came here with an interrupt means interrupts were enabled + * and we'll reenable them on return. + */ + movi a4, trace_hardirqs_on + callx4 a4 +1: +#endif + /* Restore optional registers. */ load_xtregs_opt a1 a2 a4 a5 a6 a7 PT_XTREGS_OPT |
