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Re: [PATCH 000/141] Fix fall-through warnings for Clang
- To: Joe Perches <joe@xxxxxxxxxxx>
- From: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx>
- Date: Tue, 24 Nov 2020 13:48:34 +1100 (AEDT)
- Cc: Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>, James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Jakub Kicinski <kuba@xxxxxxxxxx>, "Gustavo A. R. Silva" <gustavoars@xxxxxxxxxx>, linux-kernel <linux-kernel@xxxxxxxxxxxxxxx>, alsa-devel@xxxxxxxxxxxxxxxx, amd-gfx@xxxxxxxxxxxxxxxxxxxxx, bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx, ceph-devel@xxxxxxxxxxxxxxx, cluster-devel@xxxxxxxxxx, coreteam@xxxxxxxxxxxxx, devel@xxxxxxxxxxxxxxxxxxxx, dm-devel@xxxxxxxxxx, drbd-dev@xxxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, GR-everest-linux-l2@xxxxxxxxxxx, GR-Linux-NIC-Dev@xxxxxxxxxxx, intel-gfx@xxxxxxxxxxxxxxxxxxxxx, intel-wired-lan@xxxxxxxxxxxxxxxx, keyrings@xxxxxxxxxxxxxxx, linux1394-devel@xxxxxxxxxxxxxxxxxxxxx, linux-acpi@xxxxxxxxxxxxxxx, linux-afs@xxxxxxxxxxxxxxxxxxx, Linux ARM <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, linux-arm-msm@xxxxxxxxxxxxxxx, linux-atm-general@xxxxxxxxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-can@xxxxxxxxxxxxxxx, linux-cifs@xxxxxxxxxxxxxxx, Linux Crypto Mailing List <linux-crypto@xxxxxxxxxxxxxxx>, linux-decnet-user@xxxxxxxxxxxxxxxxxxxxx, Ext4 Developers List <linux-ext4@xxxxxxxxxxxxxxx>, linux-fbdev@xxxxxxxxxxxxxxx, linux-geode@xxxxxxxxxxxxxxxxxxx, linux-gpio@xxxxxxxxxxxxxxx, linux-hams@xxxxxxxxxxxxxxx, linux-hwmon@xxxxxxxxxxxxxxx, linux-i3c@xxxxxxxxxxxxxxxxxxx, linux-ide@xxxxxxxxxxxxxxx, linux-iio@xxxxxxxxxxxxxxx, linux-input <linux-input@xxxxxxxxxxxxxxx>, linux-integrity@xxxxxxxxxxxxxxx, linux-mediatek@xxxxxxxxxxxxxxxxxxx, Linux Media Mailing List <linux-media@xxxxxxxxxxxxxxx>, linux-mmc@xxxxxxxxxxxxxxx, Linux-MM <linux-mm@xxxxxxxxx>, linux-mtd@xxxxxxxxxxxxxxxxxxx, linux-nfs@xxxxxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx, linux-renesas-soc@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, linux-sctp@xxxxxxxxxxxxxxx, linux-security-module@xxxxxxxxxxxxxxx, linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx, linux-usb@xxxxxxxxxxxxxxx, linux-watchdog@xxxxxxxxxxxxxxx, linux-wireless <linux-wireless@xxxxxxxxxxxxxxx>, Network Development <netdev@xxxxxxxxxxxxxxx>, netfilter-devel@xxxxxxxxxxxxxxx, nouveau@xxxxxxxxxxxxxxxxxxxxx, op-tee@xxxxxxxxxxxxxxxxxxxxxxxxx, oss-drivers@xxxxxxxxxxxxx, patches@xxxxxxxxxxxxxxxxxxxxx, rds-devel@xxxxxxxxxxxxxx, reiserfs-devel@xxxxxxxxxxxxxxx, samba-technical@xxxxxxxxxxxxxxx, selinux@xxxxxxxxxxxxxxx, target-devel@xxxxxxxxxxxxxxx, tipc-discussion@xxxxxxxxxxxxxxxxxxxxx, usb-storage@xxxxxxxxxxxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, wcn36xx@xxxxxxxxxxxxxxxxxxx, "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-hardening@xxxxxxxxxxxxxxx, Nick Desaulniers <ndesaulniers@xxxxxxxxxx>, Nathan Chancellor <natechancellor@xxxxxxxxx>, Miguel Ojeda <ojeda@xxxxxxxxxx>
- Delivery-date: Tue, 24 Nov 2020 02:49:07 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Mon, 23 Nov 2020, Joe Perches wrote:
> On Tue, 2020-11-24 at 11:58 +1100, Finn Thain wrote:
> > it's not for me to prove that such patches don't affect code
> > generation. That's for the patch author and (unfortunately) for
> > reviewers.
>
> Ideally, that proof would be provided by the compilation system itself
> and not patch authors nor reviewers nor maintainers.
>
> Unfortunately gcc does not guarantee repeatability or deterministic
> output. To my knowledge, neither does clang.
>
Yes, I've said the same thing myself. But having attempted it, I now think
this is a hard problem. YMMV.
https://lore.kernel.org/linux-scsi/alpine.LNX.2.22.394.2004281017310.12@nippy.intranet/
https://lore.kernel.org/linux-scsi/alpine.LNX.2.22.394.2005211358460.8@nippy.intranet/
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