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* [PATCH v2 1/4] powerpc/interrupt: Interchange prep_irq_for_{kernel_enabled/user}_exit()
@ 2021-06-04 14:56 Christophe Leroy
  2021-06-04 14:56 ` [PATCH v2 2/4] powerpc/interrupt: Refactor prep_irq_for_user_exit() Christophe Leroy
                   ` (3 more replies)
  0 siblings, 4 replies; 9+ messages in thread
From: Christophe Leroy @ 2021-06-04 14:56 UTC (permalink / raw)
  To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
  Cc: linux-kernel, linuxppc-dev

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


^ permalink raw reply related	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2021-06-17  3:34 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-06-04 14:56 [PATCH v2 1/4] powerpc/interrupt: Interchange prep_irq_for_{kernel_enabled/user}_exit() Christophe Leroy
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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