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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-05-21 22:05:25 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-06-11 15:15:08 +0200 |
| commit | 1de16e0c17155d138282f3a9f65914a9a5da757e (patch) | |
| tree | 4e65db0bc6169ec46f79546f9b0e8756166fb54a /arch | |
| parent | eb6555c83933ce8e094d5429d57970aaa9f0591e (diff) | |
| download | driver-core-1de16e0c17155d138282f3a9f65914a9a5da757e.tar.gz | |
x86/entry: Split out idtentry_exit_cond_resched()
The XEN PV hypercall requires the ability of conditional rescheduling when
preemption is disabled because some hypercalls take ages.
Split out the rescheduling code from idtentry_exit_cond_rcu() so it can
be reused for that.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20200521202117.962199649@linutronix.de
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/entry/common.c | 30 |
1 files changed, 15 insertions, 15 deletions
diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index 2a80e4e1b4c15b..066215a243b4c7 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -583,6 +583,20 @@ bool noinstr idtentry_enter_cond_rcu(struct pt_regs *regs) return false; } +static void idtentry_exit_cond_resched(struct pt_regs *regs, bool may_sched) +{ + if (may_sched && !preempt_count()) { + /* Sanity check RCU and thread stack */ + rcu_irq_exit_check_preempt(); + if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) + WARN_ON_ONCE(!on_thread_stack()); + if (need_resched()) + preempt_schedule_irq(); + } + /* Covers both tracing and lockdep */ + trace_hardirqs_on(); +} + /** * idtentry_exit_cond_rcu - Handle return from exception with conditional RCU * handling @@ -624,21 +638,7 @@ void noinstr idtentry_exit_cond_rcu(struct pt_regs *regs, bool rcu_exit) } instrumentation_begin(); - - /* Check kernel preemption, if enabled */ - if (IS_ENABLED(CONFIG_PREEMPTION)) { - if (!preempt_count()) { - /* Sanity check RCU and thread stack */ - rcu_irq_exit_check_preempt(); - if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) - WARN_ON_ONCE(!on_thread_stack()); - if (need_resched()) - preempt_schedule_irq(); - } - } - /* Covers both tracing and lockdep */ - trace_hardirqs_on(); - + idtentry_exit_cond_resched(regs, IS_ENABLED(CONFIG_PREEMPTION)); instrumentation_end(); } else { /* |