From patchwork Mon Jan 13 17:08:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 11330599 X-Patchwork-Delegate: paulburton@kernel.org Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 358FC138D for ; Mon, 13 Jan 2020 17:09:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 105262187F for ; Mon, 13 Jan 2020 17:09:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="HtFNRPge" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728808AbgAMRIr (ORCPT ); Mon, 13 Jan 2020 12:08:47 -0500 Received: from pegase1.c-s.fr ([93.17.236.30]:44559 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728779AbgAMRIq (ORCPT ); Mon, 13 Jan 2020 12:08:46 -0500 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 47xKmk72cCz9txyx; Mon, 13 Jan 2020 18:08:38 +0100 (CET) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=HtFNRPge; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id mjoWBsPHa-lT; Mon, 13 Jan 2020 18:08:38 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 47xKmk5mb2z9txyq; Mon, 13 Jan 2020 18:08:38 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1578935318; bh=Eb2ZF+M9WBtPogiQVXilo9gV/urkBEO8lF9A3E/Edxw=; h=In-Reply-To:References:From:Subject:To:Cc:Date:From; b=HtFNRPgemN7felkbeT+FB0EwFPgnVRgimg07M9iZM8wdrHwAwhSoKmrDZbQvBZlfA n+uw1euzbaRGoi7intJLkB8fWtUVdQpvovV7HtTph8+lzZUOYBROTg3WQ6RYuxMmZf qrbTgWxm7Zg/Bj13VNbh0acYZyo3CV4jtooAuD9I= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 24A058B7C9; Mon, 13 Jan 2020 18:08:44 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id mGn9IhJ8RRPM; Mon, 13 Jan 2020 18:08:44 +0100 (CET) Received: from po14934vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id E3A8A8B7BE; Mon, 13 Jan 2020 18:08:43 +0100 (CET) Received: by localhost.localdomain (Postfix, from userid 0) id B3CB164A1D; Mon, 13 Jan 2020 17:08:43 +0000 (UTC) Message-Id: <9e4f75ca93c46b8aa0239f561f3a61dc713577f3.1578934751.git.christophe.leroy@c-s.fr> In-Reply-To: References: From: Christophe Leroy Subject: [RFC PATCH v3 05/12] lib: vdso: Avoid duplication in __cvdso_clock_getres() To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , arnd@arndb.de, tglx@linutronix.de, vincenzo.frascino@arm.com, luto@kernel.org Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, x86@kernel.org Date: Mon, 13 Jan 2020 17:08:43 +0000 (UTC) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org VDSO_HRES and VDSO_RAW clocks are handled the same way. Don't duplicate code. Before the patch: clock-getres-monotonic-raw: vdso: 737 nsec/call clock-getres-monotonic-coarse: vdso: 753 nsec/call clock-getres-monotonic: vdso: 691 nsec/call After the patch: clock-getres-monotonic-raw: vdso: 715 nsec/call clock-getres-monotonic-coarse: vdso: 715 nsec/call clock-getres-monotonic: vdso: 714 nsec/call Signed-off-by: Christophe Leroy Reviewed-by: Andy Lutomirski --- lib/vdso/gettimeofday.c | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-) diff --git a/lib/vdso/gettimeofday.c b/lib/vdso/gettimeofday.c index d75e44ba716f..decd3f2b37af 100644 --- a/lib/vdso/gettimeofday.c +++ b/lib/vdso/gettimeofday.c @@ -184,7 +184,6 @@ static __maybe_unused int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res) { const struct vdso_data *vd = __arch_get_vdso_data(); - u64 hrtimer_res; u32 msk; u64 ns; @@ -192,27 +191,21 @@ int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res) if (unlikely((u32) clock >= MAX_CLOCKS)) return -1; - hrtimer_res = READ_ONCE(vd[CS_HRES_COARSE].hrtimer_res); /* * Convert the clockid to a bitmask and use it to check which * clocks are handled in the VDSO directly. */ msk = 1U << clock; - if (msk & VDSO_HRES) { + if (msk & (VDSO_HRES | VDSO_RAW)) { /* * Preserves the behaviour of posix_get_hrtimer_res(). */ - ns = hrtimer_res; + ns = READ_ONCE(vd[CS_HRES_COARSE].hrtimer_res); } else if (msk & VDSO_COARSE) { /* * Preserves the behaviour of posix_get_coarse_res(). */ ns = LOW_RES_NSEC; - } else if (msk & VDSO_RAW) { - /* - * Preserves the behaviour of posix_get_hrtimer_res(). - */ - ns = hrtimer_res; } else { return -1; }