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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>
Subject: [PATCH 5.5 150/176] lib/vdso: Make __arch_update_vdso_data() logic understandable
Date:   Tue,  3 Mar 2020 18:43:34 +0100
Message-Id: <20200303174322.011346970@linuxfoundation.org>
In-Reply-To: <20200303174304.593872177@linuxfoundation.org>
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From: Thomas Gleixner <tglx@linutronix.de>

commit 9a6b55ac4a44060bcb782baf002859b2a2c63267 upstream.

The function name suggests that this is a boolean checking whether the
architecture asks for an update of the VDSO data, but it works the other
way round. To spare further confusion invert the logic.

Fixes: 44f57d788e7d ("timekeeping: Provide a generic update_vsyscall() implementation")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20200114185946.656652824@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm/include/asm/vdso/vsyscall.h |    4 ++--
 include/asm-generic/vdso/vsyscall.h  |    4 ++--
 kernel/time/vsyscall.c               |    2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

--- a/arch/arm/include/asm/vdso/vsyscall.h
+++ b/arch/arm/include/asm/vdso/vsyscall.h
@@ -34,9 +34,9 @@ struct vdso_data *__arm_get_k_vdso_data(
 #define __arch_get_k_vdso_data __arm_get_k_vdso_data
 
 static __always_inline
-int __arm_update_vdso_data(void)
+bool __arm_update_vdso_data(void)
 {
-	return !cntvct_ok;
+	return cntvct_ok;
 }
 #define __arch_update_vdso_data __arm_update_vdso_data
 
--- a/include/asm-generic/vdso/vsyscall.h
+++ b/include/asm-generic/vdso/vsyscall.h
@@ -12,9 +12,9 @@ static __always_inline struct vdso_data
 #endif /* __arch_get_k_vdso_data */
 
 #ifndef __arch_update_vdso_data
-static __always_inline int __arch_update_vdso_data(void)
+static __always_inline bool __arch_update_vdso_data(void)
 {
-	return 0;
+	return true;
 }
 #endif /* __arch_update_vdso_data */
 
--- a/kernel/time/vsyscall.c
+++ b/kernel/time/vsyscall.c
@@ -84,7 +84,7 @@ void update_vsyscall(struct timekeeper *
 	struct vdso_timestamp *vdso_ts;
 	u64 nsec;
 
-	if (__arch_update_vdso_data()) {
+	if (!__arch_update_vdso_data()) {
 		/*
 		 * Some architectures might want to skip the update of the
 		 * data page.