From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
npiggin@gmail.com
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v2 1/4] powerpc/interrupt: Interchange prep_irq_for_{kernel_enabled/user}_exit()
Date: Fri, 4 Jun 2021 14:56:56 +0000 (UTC) [thread overview]
Message-ID: <809d316bf5f1a81acdd69e220c13e716dac24f53.1622818556.git.christophe.leroy@csgroup.eu> (raw)
prep_irq_for_user_exit() is a superset of
prep_irq_for_kernel_enabled_exit(). In order to allow refactoring in
following patch, interchange the two as prep_irq_for_user_exit() will
call prep_irq_for_kernel_enabled_exit().
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
This series applies on top of Nic's series to speed up interrupt return on 64s
arch/powerpc/kernel/interrupt.c | 32 ++++++++++++++++----------------
1 file changed, 16 insertions(+), 16 deletions(-)
diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
index 74c995a42399..539455c62c5b 100644
--- a/arch/powerpc/kernel/interrupt.c
+++ b/arch/powerpc/kernel/interrupt.c
@@ -40,33 +40,27 @@ static inline bool exit_must_hard_disable(void)
#endif
/*
- * local irqs must be disabled. Returns false if the caller must re-enable
- * them, check for new work, and try again.
- *
- * This should be called with local irqs disabled, but if they were previously
- * enabled when the interrupt handler returns (indicating a process-context /
- * synchronous interrupt) then irqs_enabled should be true.
+ * restartable is true then EE/RI can be left on because interrupts are handled
+ * with a restart sequence.
*/
-static notrace __always_inline bool prep_irq_for_user_exit(void)
+static notrace __always_inline bool prep_irq_for_kernel_enabled_exit(bool restartable)
{
- user_enter_irqoff();
/* This must be done with RI=1 because tracing may touch vmaps */
trace_hardirqs_on();
#ifdef CONFIG_PPC32
__hard_EE_RI_disable();
#else
- if (exit_must_hard_disable())
+ if (exit_must_hard_disable() || !restartable)
__hard_EE_RI_disable();
/* This pattern matches prep_irq_for_idle */
if (unlikely(lazy_irq_pending_nocheck())) {
- if (exit_must_hard_disable()) {
+ if (exit_must_hard_disable() || !restartable) {
local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
__hard_RI_enable();
}
trace_hardirqs_off();
- user_exit_irqoff();
return false;
}
@@ -75,27 +69,33 @@ static notrace __always_inline bool prep_irq_for_user_exit(void)
}
/*
- * restartable is true then EE/RI can be left on because interrupts are handled
- * with a restart sequence.
+ * local irqs must be disabled. Returns false if the caller must re-enable
+ * them, check for new work, and try again.
+ *
+ * This should be called with local irqs disabled, but if they were previously
+ * enabled when the interrupt handler returns (indicating a process-context /
+ * synchronous interrupt) then irqs_enabled should be true.
*/
-static notrace __always_inline bool prep_irq_for_kernel_enabled_exit(bool restartable)
+static notrace __always_inline bool prep_irq_for_user_exit(void)
{
+ user_enter_irqoff();
/* This must be done with RI=1 because tracing may touch vmaps */
trace_hardirqs_on();
#ifdef CONFIG_PPC32
__hard_EE_RI_disable();
#else
- if (exit_must_hard_disable() || !restartable)
+ if (exit_must_hard_disable())
__hard_EE_RI_disable();
/* This pattern matches prep_irq_for_idle */
if (unlikely(lazy_irq_pending_nocheck())) {
- if (exit_must_hard_disable() || !restartable) {
+ if (exit_must_hard_disable()) {
local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
__hard_RI_enable();
}
trace_hardirqs_off();
+ user_exit_irqoff();
return false;
}
--
2.25.0
next reply other threads:[~2021-06-04 14:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-04 14:56 Christophe Leroy [this message]
2021-06-04 14:56 ` [PATCH v2 2/4] powerpc/interrupt: Refactor prep_irq_for_user_exit() Christophe Leroy
2021-06-11 2:30 ` Nicholas Piggin
2021-06-15 8:37 ` Christophe Leroy
2021-06-17 3:33 ` Nicholas Piggin
2021-06-04 14:56 ` [PATCH v2 3/4] powerpc/interrupt: Rename and lightly change syscall_exit_prepare_main() Christophe Leroy
2021-06-11 2:32 ` Nicholas Piggin
2021-06-04 14:56 ` [PATCH v2 4/4] powerpc/interrupt: Refactor interrupt_exit_user_prepare() Christophe Leroy
2021-06-11 2:26 ` [PATCH v2 1/4] powerpc/interrupt: Interchange prep_irq_for_{kernel_enabled/user}_exit() Nicholas Piggin
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