linux-kernel - [tip: sched/core] sched/preempt: Decouple HAVE_PREEMPT_DYNAMIC from GENERIC

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Date:   Sat, 19 Feb 2022 10:21:26 -0000
From:   "tip-bot2 for Mark Rutland" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Mark Rutland <mark.rutland@....com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/preempt: Decouple HAVE_PREEMPT_DYNAMIC from
 GENERIC_ENTRY

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     33c64734be3461222a8aa27d3dadc477ebca62de
Gitweb:        https://git.kernel.org/tip/33c64734be3461222a8aa27d3dadc477ebca62de
Author:        Mark Rutland <mark.rutland@....com>
AuthorDate:    Mon, 14 Feb 2022 16:52:13 
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Sat, 19 Feb 2022 11:11:08 +01:00

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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Ard Biesheuvel <ardb@...nel.org>
Acked-by: Frederic Weisbecker <frederic@...nel.org>
Link: https://lore.kernel.org/r/20220214165216.2231574-5-mark.rutland@arm.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 678a807..601691f 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 bf3a97f..300c045 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8149,7 +8149,9 @@ EXPORT_SYMBOL(__cond_resched_rwlock_write);
 
 #ifdef CONFIG_PREEMPT_DYNAMIC
 
+#ifdef CONFIG_GENERIC_ENTRY
 #include <linux/entry-common.h>
+#endif
 
 /*
  * SC:cond_resched