linux-kernel - [patch 06/15] MIPS: vdso: Compile high resolution parts conditionally

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Date:   Tue, 14 Jan 2020 19:52:43 +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>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Haiyang Zhang <haiyangz@...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>
Subject: [patch 06/15] MIPS: vdso: Compile high resolution parts conditionally

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();