From: Andrew Morton <akpm@linux-foundation.org>
To: Leo Yan <leo.yan@arm.com>
Cc: "Arnaldo Carvalho de Melo" <acme@kernel.org>,
"Ian Rogers" <irogers@google.com>,
"Namhyung Kim" <namhyung@kernel.org>,
"James Clark" <james.clark@linaro.org>,
"Kees Cook" <kees@kernel.org>, "Quentin Monnet" <qmo@kernel.org>,
"Nathan Chancellor" <nathan@kernel.org>,
"Nicolas Schier" <nsc@kernel.org>,
"Nick Desaulniers" <nick.desaulniers+lkml@gmail.com>,
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"Justin Stitt" <justinstitt@google.com>,
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"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eduard Zingerman" <eddyz87@gmail.com>,
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"Tejun Heo" <tj@kernel.org>, "David Vernet" <void@manifault.com>,
"Andrea Righi" <arighi@nvidia.com>,
"Changwoo Min" <changwoo@igalia.com>,
"Mark Brown" <broonie@kernel.org>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Gabriele Monaco" <gmonaco@redhat.com>,
"Shuah Khan" <shuah@kernel.org>, "Jiri Kosina" <jikos@kernel.org>,
"Benjamin Tissoires" <bentiss@kernel.org>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-perf-users@vger.kernel.org,
"Bartosz Golaszewski" <bartosz.golaszewski@oss.qualcomm.com>,
"Jonathan Cameron" <jonathan.cameron@huawei.com>
Subject: Re: [PATCH v6 00/24] tools build: Append -fzero-init-padding-bits=all option
Date: Mon, 23 Mar 2026 15:11:00 -0700 [thread overview]
Message-ID: <20260323151100.a89f36efc411c9c96e1e24bd@linux-foundation.org> (raw)
In-Reply-To: <20260323-tools_build_fix_zero_init-v6-0-235858c51af9@arm.com>
On Mon, 23 Mar 2026 15:13:21 +0000 Leo Yan <leo.yan@arm.com> wrote:
> GCC-15 doesn't guarantee that a {0} initializer clears the whole union [1].
> This may cause bugs if data is not intialized properly.
>
> The kernel enabld the -fzero-init-padding-bits=all option to tackle the
> issue, which was merged in commit dce4aab8441d ("kbuild: Use
> -fzero-init-padding-bits=all").
>
> This series propagates the same flag to the tools build. It uses
> tools/scripts/Makefile.include as the central place to add the
> option to EXTRA_CFLAGS and HOST_EXTRACFLAGS for the CC and HOSTCC
> compilers. Each project under tools/ appends the variables as needed.
>
> BPF/bpftool related patches will be sent separately, as maintainers
> prefer them to go via the BPF tree.
Some questions from AI review. Some probably legit, some probably not:
https://sashiko.dev/#/patchset/20260323-tools_build_fix_zero_init-v6-0-235858c51af9@arm.com
prev parent reply other threads:[~2026-03-23 22:11 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-23 15:13 [PATCH v6 00/24] tools build: Append -fzero-init-padding-bits=all option Leo Yan
2026-03-23 15:13 ` [PATCH v6 01/24] tools: lib: thermal: Fix typo Leo Yan
2026-03-23 15:13 ` [PATCH v6 02/24] tools/thermal: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 03/24] tools: lib: thermal: Initialize CFLAGS before including Makefile.include Leo Yan
2026-03-23 15:13 ` [PATCH v6 04/24] tools/thermal: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 05/24] tools build: Append -fzero-init-padding-bits=all to extra cflags Leo Yan
2026-03-23 15:13 ` [PATCH v6 06/24] perf build: Append extra host flags Leo Yan
2026-03-23 15:13 ` [PATCH v6 07/24] tools build: Append extra host cflags Leo Yan
2026-03-23 15:13 ` [PATCH v6 08/24] tools: bootconfig: Append extra cflags Leo Yan
2026-03-23 15:13 ` [PATCH v6 09/24] tools: counter: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 10/24] tools: dma: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 11/24] tools: gpio: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 12/24] tools: hv: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 13/24] tools: iio: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 14/24] tools: mm: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 15/24] tools: objtool: Append extra host cflags Leo Yan
2026-03-23 21:52 ` Ian Rogers
2026-03-23 15:13 ` [PATCH v6 16/24] tools: power: acpi: Append extra cflags Leo Yan
2026-03-23 15:13 ` [PATCH v6 17/24] tools: power: x86/intel-speed-select: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 18/24] tools: sched_ext: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 19/24] tools: spi: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 20/24] tools: tracing: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 21/24] tools: usb: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 22/24] selftests/hid: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 23/24] selftests/nolibc: " Leo Yan
2026-03-23 15:13 ` [PATCH v6 24/24] selftests/sched_ext: " Leo Yan
2026-03-23 21:56 ` [PATCH v6 00/24] tools build: Append -fzero-init-padding-bits=all option Ian Rogers
2026-03-23 22:11 ` Andrew Morton [this message]
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