linux-kernel - [PATCH v3 4/7] sched/preempt: decouple HAVE_PREEMPT_DYNAMIC from GENERIC

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Date:   Wed,  9 Feb 2022 15:35:32 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     ardb@...nel.org, bp@...en8.de, catalin.marinas@....com,
        dave.hansen@...ux.intel.com, frederic@...nel.org,
        james.morse@....com, joey.gouly@....com, juri.lelli@...hat.com,
        linux-kernel@...r.kernel.org, luto@...nel.org,
        mark.rutland@....com, mingo@...hat.com, peterz@...radead.org,
        tglx@...utronix.de, valentin.schneider@....com, will@...nel.org
Subject: [PATCH v3 4/7] sched/preempt: decouple HAVE_PREEMPT_DYNAMIC from GENERIC_ENTRY

Now that the enabled/disabled states for the preemption functions are
declared alongside their definitions, the core PREEMPT_DYNAMIC logic is
no longer tied to GENERIC_ENTRY, and can safely be selected so long as
an architecture provides enabled/disabled states for
irqentry_exit_cond_resched().

Make it possible to select HAVE_PREEMPT_DYNAMIC without GENERIC_ENTRY.

For existing users of HAVE_PREEMPT_DYNAMIC there should be no functional
change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@....com>
Cc: Ard Biesheuvel <ardb@...nel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Juri Lelli <juri.lelli@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Valentin Schneider <valentin.schneider@....com>
---
 arch/Kconfig        | 1 -
 kernel/sched/core.c | 2 ++
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 678a80713b21..601691f1570f 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1279,7 +1279,6 @@ config HAVE_STATIC_CALL_INLINE
 config HAVE_PREEMPT_DYNAMIC
 	bool
 	depends on HAVE_STATIC_CALL
-	depends on GENERIC_ENTRY
 	help
 	   Select this if the architecture support boot time preempt setting
 	   on top of static calls. It is strongly advised to support inline
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 414165c430f4..3bf7f90d0ef7 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8141,7 +8141,9 @@ EXPORT_SYMBOL(__cond_resched_rwlock_write);
 
 #ifdef CONFIG_PREEMPT_DYNAMIC
 
+#ifdef CONFIG_GENERIC_ENTRY
 #include <linux/entry-common.h>
+#endif
 
 /*
  * SC:cond_resched
-- 
2.30.2