linux-kernel - [PATCH 4/4] arm64: Implement HAVE_PREEMPT

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Date:   Mon, 25 Oct 2021 14:21:02 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ard Biesheuvel <ardb@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        James Morse <james.morse@....com>,
        David Laight <David.Laight@...LAB.COM>,
        Quentin Perret <qperret@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH 4/4] arm64: Implement HAVE_PREEMPT_DYNAMIC

Provide the static calls for the common preemption points and report
arm64 ability to support dynamic preemption.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Quentin Perret <qperret@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: James Morse <james.morse@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Ard Biesheuvel <ardb@...nel.org>
Cc: David Laight <David.Laight@...LAB.COM>
---
 arch/arm64/Kconfig               |  1 +
 arch/arm64/include/asm/preempt.h | 20 +++++++++++++++++---
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 34b175b1e247..24915ca7d6d5 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -191,6 +191,7 @@ config ARM64
 	select HAVE_PERF_EVENTS
 	select HAVE_PERF_REGS
 	select HAVE_PERF_USER_STACK_DUMP
+	select HAVE_PREEMPT_DYNAMIC
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select HAVE_STATIC_CALL
 	select HAVE_FUNCTION_ARG_ACCESS_API
diff --git a/arch/arm64/include/asm/preempt.h b/arch/arm64/include/asm/preempt.h
index 4fbbe644532f..69d1cc491d3b 100644
--- a/arch/arm64/include/asm/preempt.h
+++ b/arch/arm64/include/asm/preempt.h
@@ -82,15 +82,29 @@ static inline bool should_resched(int preempt_offset)
 
 #ifdef CONFIG_PREEMPTION
 void preempt_schedule(void);
-#define __preempt_schedule() preempt_schedule()
 void preempt_schedule_notrace(void);
-#define __preempt_schedule_notrace() preempt_schedule_notrace()
-#endif /* CONFIG_PREEMPTION */
 
 #ifdef CONFIG_PREEMPT_DYNAMIC
+
+#define __preempt_schedule_func preempt_schedule
+DECLARE_STATIC_CALL(preempt_schedule, __preempt_schedule_func);
+#define __preempt_schedule() static_call(preempt_schedule)()
+
+#define __preempt_schedule_notrace_func preempt_schedule_notrace
+DECLARE_STATIC_CALL(preempt_schedule_notrace, __preempt_schedule_notrace_func);
+#define __preempt_schedule_notrace() static_call(preempt_schedule_notrace)()
+
 void arm64_preempt_schedule_irq(void);
 #define __irqentry_exit_cond_resched_func arm64_preempt_schedule_irq
 DECLARE_STATIC_CALL(irqentry_exit_cond_resched, __irqentry_exit_cond_resched_func);
+
+#else /* !CONFIG_PREEMPT_DYNAMIC */
+
+#define __preempt_schedule() preempt_schedule()
+#define __preempt_schedule_notrace() preempt_schedule_notrace()
+
 #endif /* CONFIG_PREEMPT_DYNAMIC */
 
+#endif /* CONFIG_PREEMPTION */
+
 #endif /* __ASM_PREEMPT_H */
-- 
2.25.1