linux-kernel - [PATCH 5/5] arm64: Implement HAVE_PREEMPT

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: <20211220140142.922323-6-frederic@kernel.org>
Date:   Mon, 20 Dec 2021 15:01:42 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        James Morse <james.morse@....com>,
        David Laight <David.Laight@...LAB.COM>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Quentin Perret <qperret@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH 5/5] 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>
Cc: Kees Cook <keescook@...omium.org>
Cc: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
---
 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 6f2d3e31fb54..f7d55ae0b4a2 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_POSIX_CPU_TIMERS_TASK_WORK
 	# https://github.com/ClangBuiltLinux/linux/issues/1354
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