From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 75137C35280 for ; Thu, 7 May 2020 22:46:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 48C5E20725 for ; Thu, 7 May 2020 22:46:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="EMkPBPwa" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727785AbgEGWqI (ORCPT ); Thu, 7 May 2020 18:46:08 -0400 Received: from mail.zx2c4.com ([192.95.5.64]:33597 "EHLO mail.zx2c4.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726437AbgEGWqH (ORCPT ); Thu, 7 May 2020 18:46:07 -0400 Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTP id 50c3cd25; Thu, 7 May 2020 22:33:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=zx2c4.com; h=from:to:cc :subject:date:message-id:mime-version:content-transfer-encoding; s=mail; bh=Y28RivJhmM6MWjyY0gj84oLdWLQ=; b=EMkPBPwaICbxaPVNifu4 q3vOcEPh1st206ZYU4wMRszU8E03NYrwDtsQag8ZV2cGoaI1itp016gf8EIAz5dZ NhL9MlLsvFI2dnE8kV8ELBHIGxsFasECHkQGu9HukIhZR5NraqdArsCL5TknDdNK 0UMCxycoLDx9swoh2dlWxZ5uTeyYj3HC3XM0k0Ksb3Fnl3jqnozCYiUUF5tk4i62 9c3wqlhRH2i2F3FGF4BnIuXVO6RRpbaYQ7bnPl9gdRplAmcCs+cY2hk9JunyMV3W 88jSI5G9RLZXGZ00Mbq3SEw4S/iaeUr95vpSYPVtmFb+KW5TjilTe+kqtmhE7GLk gA== Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id a66014fb (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Thu, 7 May 2020 22:33:14 +0000 (UTC) From: "Jason A. Donenfeld" To: linux-kernel@vger.kernel.org, x86@kernel.org Cc: "Jason A. Donenfeld" Subject: [PATCH] Kconfig: default to CC_OPTIMIZE_FOR_PERFORMANCE_O3 for gcc >= 10 Date: Thu, 7 May 2020 16:45:30 -0600 Message-Id: <20200507224530.2993316-1-Jason@zx2c4.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org GCC 10 appears to have changed -O2 in order to make compilation time faster when using -flto, seemingly at the expense of performance, in particular with regards to how the inliner works. Since -O3 these days shouldn't have the same set of bugs as 10 years ago, this commit defaults new kernel compiles to -O3 when using gcc >= 10. Signed-off-by: Jason A. Donenfeld --- init/Kconfig | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/init/Kconfig b/init/Kconfig index 9e22ee8fbd75..fab3f810a68d 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1245,7 +1245,8 @@ config BOOT_CONFIG choice prompt "Compiler optimization level" - default CC_OPTIMIZE_FOR_PERFORMANCE + default CC_OPTIMIZE_FOR_PERFORMANCE_O3 if GCC_VERSION >= 100000 + default CC_OPTIMIZE_FOR_PERFORMANCE if (GCC_VERSION < 100000 || CC_IS_CLANG) config CC_OPTIMIZE_FOR_PERFORMANCE bool "Optimize for performance (-O2)" -- 2.26.2