linux-kernel - [PATCH 4/6] sched/preempt: decouple HAVE_PREEMPT_DYNAMIC from GENERIC

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20211109172408.49641-5-mark.rutland@arm.com>
Date:   Tue,  9 Nov 2021 17:24:06 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     ardb@...nel.org, catalin.marinas@....com, frederic@...nel.org,
        juri.lelli@...hat.com, linux-kernel@...r.kernel.org,
        mark.rutland@....com, mingo@...hat.com, peterz@...radead.org,
        will@...nel.org
Subject: [PATCH 4/6] 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>
---
 arch/Kconfig        | 1 -
 kernel/sched/core.c | 2 ++
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 26b8ed11639d..f3fb543d5da0 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1266,7 +1266,6 @@ 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 3a1caa9a095a..ff28f4bd7192 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8102,7 +8102,9 @@ EXPORT_SYMBOL(__cond_resched_rwlock_write);
 
 #ifdef CONFIG_PREEMPT_DYNAMIC
 
+#ifdef CONFIG_GENERIC_ENTRY
 #include <linux/entry-common.h>
+#endif
 
 /*
  * SC:cond_resched
-- 
2.11.0