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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 85875C67871 for ; Mon, 24 Oct 2022 19:57:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233381AbiJXT5q (ORCPT ); Mon, 24 Oct 2022 15:57:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41640 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233896AbiJXT5S (ORCPT ); Mon, 24 Oct 2022 15:57:18 -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 78ACBED9BA for ; Mon, 24 Oct 2022 11:20:24 -0700 (PDT) Received: by mail-pj1-x104a.google.com with SMTP id c91-20020a17090a496400b00212eb50e75cso1903552pjh.6 for ; Mon, 24 Oct 2022 11:20:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:mime-version:message-id:date:from:to:cc:subject :date:message-id:reply-to; bh=OdPpZnwd5jRn69z8VmyRRXOs+WnLWZPFgd+7/iBzwHk=; b=NfrgsUTi4AApD9BZxfhAegOIzfnADBYbmqWCGsTBOOc7z6DCGVA6S5DGI56c3/0HTK 3BuxuXx7aAY92LOmjN8o6+cd2dWG2ItvAJs2cNSk/KXbYeoUybsaEXziRA1t0YN6Io53 Vg1GCS1dJ4xCUUxB6HolGFsWwaXlY9IllaWJonUcug574p7flVeJc9EgvgLtCaV/DXb5 rNPH89aOcXb8wQjOZuw7PvPeSOKL3r61V8Em7fupmdz6/IberQWfB3vrQgONNxqTBR5a XVYq31YpR56iR0tRAxHK9QXbEYG+HLkoRNnoCIcdT4wTqMABZL528o45hcEMERtSsoqC iF4w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:mime-version:message-id:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=OdPpZnwd5jRn69z8VmyRRXOs+WnLWZPFgd+7/iBzwHk=; b=xFmFdAB4H+NTzU2BlZHwHhpLriupQqaJG+Cc8v2/hNTXR2XsxyAkoRb7SyK8CBag5M 7M8/DdgxbKgxLXspV+D2ci1+6bfk/+KTSVxk+WeBXG3vG5TUMLUuwCwYZku36W7ImWin PjWL55KuQ3zRThXxZ2xQRgJ1PdlF3fR1yOS+U9nANuwBHNNtNEMhMvl9flse1BrTNWtQ dyArx4Qz88Bt0yBCK6DbcSWmwQbufifwJ3gnMoz5cQHbS63O1a+V9RYCxGNkB/MEv1HB 2OyJ19tW5wSsrNTpDfQJikV3HRfuvxwSCBBzvRGzclzjH4PVmKBDnzy4pIxeuh6QkGK5 kZ0A== X-Gm-Message-State: ACrzQf0jitgSqXLeDUwUwZuikBcCfugfrKRcwQIoD2/AFajhkVfJ5B28 +ew0JVgeeZCXW04Mu+xQfjqDUHS0crwz X-Google-Smtp-Source: AMsMyM7gOJ73zL6REh5JLPAg6wf0lT6uPprEpgZedLo1aYSYyI73sfxgXgK0r3WCA8xTVaZu8s4FZZYmNjnv X-Received: from irogers.svl.corp.google.com ([2620:15c:2d4:203:b8bc:a57d:a2a2:efdc]) (user=irogers job=sendgmr) by 2002:a17:90b:e90:b0:213:2708:8dc3 with SMTP id fv16-20020a17090b0e9000b0021327088dc3mr247684pjb.2.1666635575295; Mon, 24 Oct 2022 11:19:35 -0700 (PDT) Date: Mon, 24 Oct 2022 11:19:05 -0700 Message-Id: <20221024181913.630986-1-irogers@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.38.0.135.g90850a2211-goog Subject: [PATCH v2 0/8] Update to C11, fix signal undefined behavior From: Ian Rogers To: Leo Yan , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Adrian Hunter , Alexey Bayduraev , German Gomez , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Stephane Eranian , Ian Rogers Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The use of C11 is mainstream in the kernel [1]. There was some confusion on volatile and signal handlers in [2] for which atomics (present in C11) make things clearer. Switch to using volatile sig_atomic_t as per [3]. Thanks to Leo Yan for the suggestions. [1] https://lore.kernel.org/lkml/CAHk-=whWbENRz-vLY6vpESDLj6kGUTKO3khGtVfipHqwewh2HQ@mail.gmail.com/ [2] https://lore.kernel.org/lkml/20221024011024.462518-1-irogers@google.com/ [3] https://wiki.sei.cmu.edu/confluence/display/c/SIG31-C.+Do+not+access+shared+objects+in+signal+handlers v2. Remove unneeded stdatomic.h includes for sig_atomic_t as it is declared in signal.h. Ian Rogers (8): perf build: Update to C standard to gnu11 perf record: Use sig_atomic_t for signal handlers perf daemon: Use sig_atomic_t to avoid UB perf ftrace: Use sig_atomic_t to avoid UB perf session: Change type to avoid UB perf stat: Use sig_atomic_t to avoid UB perf top: Use sig_atomic_t to avoid UB perf trace: Use sig_atomic_t to avoid UB tools/perf/Makefile.config | 2 +- tools/perf/builtin-daemon.c | 2 +- tools/perf/builtin-ftrace.c | 4 ++-- tools/perf/builtin-record.c | 8 ++++---- tools/perf/builtin-stat.c | 8 ++++---- tools/perf/builtin-top.c | 4 ++-- tools/perf/builtin-trace.c | 4 ++-- tools/perf/util/session.c | 3 ++- 8 files changed, 18 insertions(+), 17 deletions(-) -- 2.38.0.135.g90850a2211-goog