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dkim=pass header.d=suse.com header.s=susede1 header.b=OWCb5EOT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1759736813; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=oj+q7e4wJ8KHifBxZWmsDCnOFxDHhXGK3TRIXIaeHY8=; b=OWCb5EOTmwm9yuRsMZNPEKYyXZcM6O3kSsjxXjhjRqHEOPUUOHtv8VZYGmn9BsqJdGAmsg NgOTrl4WI2llQcTa0jkvitiBZzhIi9tfSdQz0BQOzwJ8WT9JqzoMdaRL6gmH9CcvPn/Z0q a/VSczJ7lhYaMm7ECciguZzXO83Yr1U= From: Juergen Gross To: linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, x86@kernel.org Cc: Juergen Gross , Russell King , Ajay Kaher , Alexey Makhalov , Broadcom internal kernel review list , Stefano Stabellini , Oleksandr Tyshchenko , linux-arm-kernel@lists.infradead.org, xen-devel@lists.xenproject.org, "Peter Zijlstra (Intel)" Subject: [PATCH v3 07/21] arm/paravirt: Use common code for paravirt_steal_clock() Date: Mon, 6 Oct 2025 09:45:52 +0200 Message-ID: <20251006074606.1266-8-jgross@suse.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251006074606.1266-1-jgross@suse.com> References: <20251006074606.1266-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Level: X-Spam-Flag: NO X-Rspamd-Queue-Id: 8EC7F1F452 X-Rspamd-Action: no action X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spamd-Result: default: False [-3.01 / 50.00]; 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charset="utf-8" Remove the arch specific variant of paravirt_steal_clock() and use the common one instead. This allows to remove paravirt.c and paravirt.h from arch/arm. Until all archs supporting Xen have been switched to the common code of paravirt_steal_clock(), drivers/xen/time.c needs to include asm/paravirt.h for those archs, while this is not necessary for arm any longer. Signed-off-by: Juergen Gross Acked-by: Peter Zijlstra (Intel) --- arch/arm/Kconfig | 1 + arch/arm/include/asm/paravirt.h | 18 ------------------ arch/arm/kernel/Makefile | 1 - arch/arm/kernel/paravirt.c | 20 -------------------- drivers/xen/time.c | 2 ++ 5 files changed, 3 insertions(+), 39 deletions(-) delete mode 100644 arch/arm/include/asm/paravirt.h delete mode 100644 arch/arm/kernel/paravirt.c diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 2a124c92e4f6..39ab0860bfbc 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1319,6 +1319,7 @@ config UACCESS_WITH_MEMCPY =20 config PARAVIRT bool "Enable paravirtualization code" + select HAVE_PV_STEAL_CLOCK_GEN help This changes the kernel so it can modify itself when it is run under a hypervisor, potentially improving performance significantly diff --git a/arch/arm/include/asm/paravirt.h b/arch/arm/include/asm/paravir= t.h deleted file mode 100644 index 69da4bdcf856..000000000000 --- a/arch/arm/include/asm/paravirt.h +++ /dev/null @@ -1,18 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#ifndef _ASM_ARM_PARAVIRT_H -#define _ASM_ARM_PARAVIRT_H - -#ifdef CONFIG_PARAVIRT -#include - -u64 dummy_steal_clock(int cpu); - -DECLARE_STATIC_CALL(pv_steal_clock, dummy_steal_clock); - -static inline u64 paravirt_steal_clock(int cpu) -{ - return static_call(pv_steal_clock)(cpu); -} -#endif - -#endif diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index afc9de7ef9a1..b36cf0cfd4a7 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -83,7 +83,6 @@ AFLAGS_iwmmxt.o :=3D -Wa,-mcpu=3Diwmmxt obj-$(CONFIG_ARM_CPU_TOPOLOGY) +=3D topology.o obj-$(CONFIG_VDSO) +=3D vdso.o obj-$(CONFIG_EFI) +=3D efi.o -obj-$(CONFIG_PARAVIRT) +=3D paravirt.o =20 obj-y +=3D head$(MMUEXT).o obj-$(CONFIG_DEBUG_LL) +=3D debug.o diff --git a/arch/arm/kernel/paravirt.c b/arch/arm/kernel/paravirt.c deleted file mode 100644 index 3895a5578852..000000000000 --- a/arch/arm/kernel/paravirt.c +++ /dev/null @@ -1,20 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * - * Copyright (C) 2013 Citrix Systems - * - * Author: Stefano Stabellini - */ - -#include -#include -#include -#include -#include - -static u64 native_steal_clock(int cpu) -{ - return 0; -} - -DEFINE_STATIC_CALL(pv_steal_clock, native_steal_clock); diff --git a/drivers/xen/time.c b/drivers/xen/time.c index d360ded2ef39..53b12f5ac465 100644 --- a/drivers/xen/time.c +++ b/drivers/xen/time.c @@ -10,7 +10,9 @@ #include #include =20 +#ifndef CONFIG_HAVE_PV_STEAL_CLOCK_GEN #include +#endif #include #include =20 --=20 2.51.0