From nobody Mon Feb 9 04:14:41 2026 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 151EE1DE2CB for ; Thu, 24 Apr 2025 06:19:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745475592; cv=none; b=uRpPDVjF4PoA+5tB0ZhEn6TTYzhecl+28aHxOvSDzoq9S98yiTnAMym4+FsLQ2cJKLHFQ3X8jNdGbJZyGyO8FnfdWhXTgRYc639t++QufdAeBGi3ho96QVQ7w2jgOst//n3IcgGPu5YwSQ7qgap5ZAinlwF7VvrJXZWhO/iY6cM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745475592; c=relaxed/simple; bh=8WBEzvFvzcnUry5ByhlVSbBbZ7FtMYDtGZpBJNOydFQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Content-Type; b=F4pQif1MLLh2yC8Xb7k71aLr+Zxi/KYxRYli7HouBaG0+gHypbhzl1uQOQbQNVPghTPU+/olndaYvcu9j7cBiErGEA6+zMpBcwYMy05DYofGA+UVrrGYCpP987TeD33lRBF9OrTludaLYlBB3Fo41fpskGiauZhjkKupzRHIBgw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=yy84hYsJ; arc=none smtp.client-ip=209.85.216.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="yy84hYsJ" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-3032f4eca83so685531a91.3 for ; Wed, 23 Apr 2025 23:19:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1745475590; x=1746080390; darn=vger.kernel.org; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :from:to:cc:subject:date:message-id:reply-to; bh=mlBZFAnQpqkb4CsXjJ6dhx6UI0k4k3C05j4TiMvZBL4=; b=yy84hYsJDwzcytu0gZEofNvmSzWX7iuzLwEcCs2Zdl6BL1Or1+1xZUG+0Nbp2M6Vf+ /vHxzcbOtYVYJwh7XM/8lb4rGWxbu7zgbQ1DSDzdTRidr5jFRHMS7FL5fnPy/J5m9QTG ywARzx9e3/sNAAH+tTVxzDEjqwRKf2EQ9bnYkFMchJAfIvAg7WXMFRNwNYFFncutYLrx O1bhnZX8xJqcsSz7EhcXU0CtAKEVUAPlsFj18QkvIXxFqgS7RetoC4/jU8d5cRYjehil eOFJSpcbL3+wogQN/1COvkYmtOgGY08aaxnTvlaUEIcQ8Uvn+poz3+MIVGy0/tqNMh3G 2s3A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1745475590; x=1746080390; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=mlBZFAnQpqkb4CsXjJ6dhx6UI0k4k3C05j4TiMvZBL4=; b=S1pHlHRzbl4z9td9Afrj1cZSEgleDnaQnNZvvmUIq++kjbyVeDB/OO0MOR0iNYLDiF JS69b8nkK2ylv+JDkPA1iCoGZUN42dCIkCSbLn7iD9YVDb3FC9HTkXvrjPxYEYxu2PT9 fcOkd28HshUtxDIa67MpPZy7T5rcA7CneBfz+HVdIf4XaUGefYtrLjnYhNtBsdT6ymb5 nPCvxqPVHys6PksNsTqEsAfCyqtwR1AQE9UvI6snHDnlHb8PP397NobZnAhh9O3KYuHS fYZMnBQAUvx4+wVW6boe7F4ow/8MbcKLQnin8DYNZV9F5ulhFqibbgB0IC2w+KkZhOJV bICA== X-Forwarded-Encrypted: i=1; AJvYcCWFm1fC+jSgjaY38qfjYp1HxjgGur1CHofvN4RTWGsmaHIBCvAqUebgW3+yF5LVhq5T3X5s2RbJbzWJqx0=@vger.kernel.org X-Gm-Message-State: AOJu0YwTwTwwepR2E5tUeY2E1mSIYOIckuScjOR6Aso5jQT22WvgAaTN i7kRd7UrjjCgW4ySL71d332YTi1Z8UcsI6Oh/H2tV8qrZZdsntJ1665vdE4qM1wfWMzMHAVVsDJ TRULtaQ== X-Google-Smtp-Source: AGHT+IGGogw0YsFms32g9TlBHej1fV/Wy4O+HvhrKdgWqhm2gdg7i+rPeo9GR+c9Tekt2aEKLL75eFpjU0V2 X-Received: from pjbqn11.prod.google.com ([2002:a17:90b:3d4b:b0:2f9:e05f:187f]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:3a43:b0:2fe:a336:fe63 with SMTP id 98e67ed59e1d1-309ed33b7e2mr2615005a91.24.1745475590353; Wed, 23 Apr 2025 23:19:50 -0700 (PDT) Date: Wed, 23 Apr 2025 23:19:39 -0700 In-Reply-To: <20250424061943.1321025-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250424061943.1321025-1-irogers@google.com> X-Mailer: git-send-email 2.49.0.805.g082f7c87e0-goog Message-ID: <20250424061943.1321025-2-irogers@google.com> Subject: [PATCH v1 1/5] perf build-id: Reduce size of "size" variable From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , Athira Rajeev , Kajol Jain , Li Huafei , "Steinar H. Gunderson" , Stephen Brennan , James Clark , Andi Kleen , Dmitry Vyukov , Zhongqiu Han , Yicong Yang , Michael Petlan , "=?UTF-8?q?Krzysztof=20=C5=81opatowski?=" , "Dr. David Alan Gilbert" , Leo Yan , Steve Clevenger , Zixian Cai , Thomas Falcon , Martin Liska , "=?UTF-8?q?Martin=20Li=C5=A1ka?=" , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Later clean up of the dso_id to include a build_id will suffer from alignment and size issues. The size can only hold up to a value of BUILD_ID_SIZE (20) and the mmap2 event uses a byte for the value. Signed-off-by: Ian Rogers --- tools/perf/util/build-id.h | 2 +- tools/perf/util/synthetic-events.c | 8 ++++++-- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h index a212497bfdb0..e3e0a446ff0c 100644 --- a/tools/perf/util/build-id.h +++ b/tools/perf/util/build-id.h @@ -13,7 +13,7 @@ =20 struct build_id { u8 data[BUILD_ID_SIZE]; - size_t size; + u8 size; }; =20 struct dso; diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic= -events.c index 2fc4d0537840..68bb7c5fe1b1 100644 --- a/tools/perf/util/synthetic-events.c +++ b/tools/perf/util/synthetic-events.c @@ -2248,7 +2248,9 @@ int perf_event__synthesize_build_id(const struct perf= _tool *tool, =20 memset(&ev, 0, len); =20 - ev.build_id.size =3D min(bid->size, sizeof(ev.build_id.build_id)); + ev.build_id.size =3D bid->size; + if (ev.build_id.size > sizeof(ev.build_id.build_id)) + ev.build_id.size =3D sizeof(ev.build_id.build_id); memcpy(ev.build_id.build_id, bid->data, ev.build_id.size); ev.build_id.header.type =3D PERF_RECORD_HEADER_BUILD_ID; ev.build_id.header.misc =3D misc | PERF_RECORD_MISC_BUILD_ID_SIZE; @@ -2308,7 +2310,9 @@ int perf_event__synthesize_mmap2_build_id(const struc= t perf_tool *tool, ev.mmap2.len =3D len; ev.mmap2.pgoff =3D pgoff; =20 - ev.mmap2.build_id_size =3D min(bid->size, sizeof(ev.mmap2.build_id)); + ev.mmap2.build_id_size =3D bid->size; + if (ev.mmap2.build_id_size > sizeof(ev.mmap2.build_id)) + ev.build_id.size =3D sizeof(ev.mmap2.build_id); memcpy(ev.mmap2.build_id, bid->data, ev.mmap2.build_id_size); =20 ev.mmap2.prot =3D prot; --=20 2.49.0.805.g082f7c87e0-goog