From patchwork Fri Sep 30 20:33:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 12995972 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A983C4332F for ; Fri, 30 Sep 2022 20:33:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231408AbiI3UdX (ORCPT ); Fri, 30 Sep 2022 16:33:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59734 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232542AbiI3UdT (ORCPT ); Fri, 30 Sep 2022 16:33:19 -0400 Received: from mail-pj1-x104a.google.com (mail-pj1-x104a.google.com [IPv6:2607:f8b0:4864:20::104a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E319C1D7BFB for ; Fri, 30 Sep 2022 13:33:16 -0700 (PDT) Received: by mail-pj1-x104a.google.com with SMTP id m2-20020a17090a158200b002058e593c2bso3193524pja.2 for ; Fri, 30 Sep 2022 13:33:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date; bh=SMQsBtCCyLRrqpBDgN2Zoeao+ul/V+LJS6j1U8pzQAU=; b=JVe8vVsAiLOpWL3/NzYtEi2BruvEjHVm4AEMgx5mc+Ak77rP8Jn9WKf6W8EyjFam2W KfDCzI3KrvVgqbNhjxoez9qP5YEmbdUysYr9GoCP1FW6BXKAoMJg3z62g2AVRExvSItO ST7N4OvdR10yDD31HpFVvaviiwtZXkcWkUHN4BUBKZ6kbWrOx9bHCUDM1hnbjh0OB/LZ +4evEXvbMukJR3Z7UJPKMhEQvgUVk6VZoGsD4dxkiwBIDf5lgOZLoh6U9oNmPRixYW2z InT4O0wyUrlRVLU87m+DiRzIw7QXhJZJDPnK6cg+xujAwI/HKnh7B0Qa97c09DHyCmIL 5A3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date; bh=SMQsBtCCyLRrqpBDgN2Zoeao+ul/V+LJS6j1U8pzQAU=; b=eyjRPnRNhxkv6xE+vXostsahRtMK1H4t+bHYT8zmNf921SQsi92mQj2vzPUo4wEYPh QoM6mbwRcOq5JxCGKEHs7hBoU8fOnJXdrXCHFshTzxNzONgt+DruUw0IZXTDeY36aL1i DsU9oPwHtzO5PcgN47XHOxnaSqp9UhS5tLMdEjJ7Ql0UIWGAF1EEWyMx5CfkSaKO0qXJ r8DqSr0FASqdEUTIyX3cOkyujXZu8EeZI9gQ0SvEpueBz8c5cKVyPw1GVi12HJBpa7Io PykQytmGtPdwOTi/NLQy0Rz1YvoPcNycixHjOw3P0uKtMBYCTsTm3ekzIqDgDGXwzb+b SYMQ== X-Gm-Message-State: ACrzQf3qw6gySnmBorq2rzzLTT2Ys25bFQA24uBi0T/g7jQdhdykytmh Lu2mBahhXG8s8YWMjIOeWfUEfPSHFbhlf8l8sMw= X-Google-Smtp-Source: AMsMyM4eAqTCDUfydVdhf5U7mW3z+20dr+NzSt2BRmPuylTSU+w9kmiWK1I1Beyd2swmkxphq45pk8BzPKKFXP13glo= X-Received: from samitolvanen.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:4f92]) (user=samitolvanen job=sendgmr) by 2002:a17:90b:1b06:b0:20a:6d32:b05e with SMTP id nu6-20020a17090b1b0600b0020a6d32b05emr35559pjb.103.1664569996339; Fri, 30 Sep 2022 13:33:16 -0700 (PDT) Date: Fri, 30 Sep 2022 20:33:10 +0000 Mime-Version: 1.0 X-Developer-Key: i=samitolvanen@google.com; a=openpgp; fpr=35CCFB63B283D6D3AEB783944CB5F6848BBC56EE X-Developer-Signature: v=1; a=openpgp-sha256; l=1362; i=samitolvanen@google.com; h=from:subject; bh=cb9uxuoR+cjTVhl0LEU/KRuB1nV8Tr++NRhDrxG0pH4=; b=owEB7QES/pANAwAKAUy19oSLvFbuAcsmYgBjN1KGfuXEg/p2HFc8oG4zdl0hi2M0tCCEpmBR8vbU mUEvbkOJAbMEAAEKAB0WIQQ1zPtjsoPW0663g5RMtfaEi7xW7gUCYzdShgAKCRBMtfaEi7xW7o3tC/ 4gIorPccJBNlneIDwxrzmurGTgMjEeX26RFRVwv1bFgkbufV7u5gYf1jZCrCRrckERcBv7s33gacaH yEHS51srndw7V5ol/CX17484w4zcqhkH2nNeZP996dY9m6tYwJsHHSYgRv5N6gcwzUaFa6+rPqHFbb 5yH2tr+5q4c6aN5Ra9Wj83rCOw6aaNCnvOG8nhhT69MHyX6esWf1sec64IIyd8q7v1d8aXKIdz2PJ4 Ae7bsBLZClrEcol4ijmrLF1iGizStoGTNj9xMwG9w5v/2b5mrtgqtq40qS0dW57Gp/QJjPuRcPYoMb dD8q9EpQazoDLbScLb62qEOwX1G/H7GRmB1Q21KJGAmwCinxforNZFI9L4RyQXmkVzx+G6aeFH2vcl tMleRf8wUgpPUQOHrLzwcC4hZwapkOsp2NYhpt6QjGO3nqowr769r+oK0/H5CN55y9+JJotNsKuaAg 3ZRV9R/cRNiXFj9x7u3YnkUfAVkxpRQnoMA5t3T9cxrQs= X-Mailer: git-send-email 2.38.0.rc1.362.ged0d419d3c-goog Message-ID: <20220930203310.4010564-1-samitolvanen@google.com> Subject: [PATCH] Makefile.extrawarn: Move -Wcast-function-type-strict to W=1 From: Sami Tolvanen To: Masahiro Yamada , Michal Marek Cc: Nick Desaulniers , Nathan Chancellor , Tom Rix , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Kees Cook , Sami Tolvanen , stable@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org We enable -Wcast-function-type globally in the kernel to warn about mismatching types in function pointer casts. Compilers currently warn only about ABI incompability with this flag, but Clang 16 will enable a stricter version of the check by default that checks for an exact type match. This will be very noisy in the kernel, so disable -Wcast-function-type-strict without W=1 until the new warnings have been addressed. Cc: stable@vger.kernel.org Link: https://reviews.llvm.org/D134831 Link: https://github.com/ClangBuiltLinux/linux/issues/1724 Suggested-by: Nathan Chancellor Signed-off-by: Sami Tolvanen --- scripts/Makefile.extrawarn | 1 + 1 file changed, 1 insertion(+) base-commit: 7bc6e90d7aa4170039abe80b9f4e8c8e4eb35091 diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn index 6ae482158bc4..52bd7df84fd6 100644 --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -64,6 +64,7 @@ KBUILD_CFLAGS += -Wno-sign-compare KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast) KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access) +KBUILD_CFLAGS += $(call cc-disable-warning, cast-function-type-strict) endif endif