linux-kernel - [patch V2 05/17] MIPS: vdso: Compile high resolution parts conditionally

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Message-Id: <20200207124402.714585315@linutronix.de>
Date:   Fri, 07 Feb 2020 13:38:52 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, John Stultz <john.stultz@...aro.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Andy Lutomirski <luto@...nel.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        James Hogan <jhogan@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>, Andrei Vagin <avagin@...il.com>
Subject: [patch V2 05/17] MIPS: vdso: Compile high resolution parts conditionally

From: Thomas Gleixner <tglx@...utronix.de>

If neither the R4K nor the GIC timer is enabled in the kernel configuration
then let the core VDSO code drop the high resolution parts at compile time.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/mips/include/asm/vdso/gettimeofday.h |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/arch/mips/include/asm/vdso/gettimeofday.h
+++ b/arch/mips/include/asm/vdso/gettimeofday.h
@@ -199,6 +199,13 @@ static __always_inline u64 __arch_get_hw
 	return cycle_now;
 }
 
+static inline bool mips_vdso_hres_capable(void)
+{
+	return IS_ENABLED(CONFIG_CSRC_R4K) ||
+	       IS_ENABLED(CONFIG_CLKSRC_MIPS_GIC);
+}
+#define __arch_vdso_hres_capable mips_vdso_hres_capable
+
 static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
 {
 	return get_vdso_data();