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From: Arnd Bergmann <arnd@kernel.org>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: Will Deacon <will@kernel.org>,
	linux-toolchains@vger.kernel.org,
	Mark Rutland <mark.rutland@arm.com>,
	"Theodore Ts'o" <tytso@mit.edu>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	Ext4 Developers List <linux-ext4@vger.kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: Aarch64 EXT4FS inode checksum failures - seems to be weak memory ordering issues
Date: Thu, 7 Jan 2021 22:20:38 +0100	[thread overview]
Message-ID: <CAK8P3a2J8fLjPhyV0XUeuRBdSo6rz1gU4wrQRyfzKQvwhf22ag@mail.gmail.com> (raw)
In-Reply-To: <20210107133747.GP1551@shell.armlinux.org.uk>

On Thu, Jan 7, 2021 at 2:37 PM Russell King - ARM Linux admin
<linux@armlinux.org.uk> wrote:
> On Thu, Jan 07, 2021 at 02:16:25PM +0100, Arnd Bergmann wrote:
> > On Thu, Jan 7, 2021 at 1:47 PM Russell King - ARM Linux admin
> > <linux@armlinux.org.uk> wrote:
>
> > The gcc bugzilla mentions backports into gcc-linaro, but I do not see
> > them in my git history.

Correction: I looked in the wrong branch, gcc-linaro does have it, as
does the Android gcc, which was recently still at 4.9 before they dropped it
in favor of clang.

> So, do we raise the minimum gcc version for the kernel as a whole to 5.1
> or just for aarch64?

I'd personally love to see gcc-5 as the global minimum version, as that
would let us finally use --std=gnu11 features instead of gnu89. [There are
a couple of useful features that are incompatible with gnu89, and
gnu99/gnu11 support in gcc didn't like the kernel sources]

If we make it arm64 specific, I'd propose only making it a build-time
warning instead of an error, as there are no other benefits to increasing
the minimum version if gcc-4.9 is still an option for other architectures,
and most gcc-4.9 users (Android, Red Hat and everyone using gcc-linaro)
have backported this bugfix already.

         Arnd

WARNING: multiple messages have this Message-ID
From: Arnd Bergmann <arnd@kernel.org>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Theodore Ts'o <tytso@mit.edu>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	linux-toolchains@vger.kernel.org,
	Ext4 Developers List <linux-ext4@vger.kernel.org>,
	Will Deacon <will@kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: Aarch64 EXT4FS inode checksum failures - seems to be weak memory ordering issues
Date: Thu, 7 Jan 2021 22:20:38 +0100	[thread overview]
Message-ID: <CAK8P3a2J8fLjPhyV0XUeuRBdSo6rz1gU4wrQRyfzKQvwhf22ag@mail.gmail.com> (raw)
In-Reply-To: <20210107133747.GP1551@shell.armlinux.org.uk>

On Thu, Jan 7, 2021 at 2:37 PM Russell King - ARM Linux admin
<linux@armlinux.org.uk> wrote:
> On Thu, Jan 07, 2021 at 02:16:25PM +0100, Arnd Bergmann wrote:
> > On Thu, Jan 7, 2021 at 1:47 PM Russell King - ARM Linux admin
> > <linux@armlinux.org.uk> wrote:
>
> > The gcc bugzilla mentions backports into gcc-linaro, but I do not see
> > them in my git history.

Correction: I looked in the wrong branch, gcc-linaro does have it, as
does the Android gcc, which was recently still at 4.9 before they dropped it
in favor of clang.

> So, do we raise the minimum gcc version for the kernel as a whole to 5.1
> or just for aarch64?

I'd personally love to see gcc-5 as the global minimum version, as that
would let us finally use --std=gnu11 features instead of gnu89. [There are
a couple of useful features that are incompatible with gnu89, and
gnu99/gnu11 support in gcc didn't like the kernel sources]

If we make it arm64 specific, I'd propose only making it a build-time
warning instead of an error, as there are no other benefits to increasing
the minimum version if gcc-4.9 is still an option for other architectures,
and most gcc-4.9 users (Android, Red Hat and everyone using gcc-linaro)
have backported this bugfix already.

         Arnd

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2021-01-07 21:21 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-05 15:47 Russell King - ARM Linux admin
2021-01-05 15:47 ` Russell King - ARM Linux admin
2021-01-05 18:27 ` Darrick J. Wong
2021-01-05 18:27   ` Darrick J. Wong
2021-01-05 19:50   ` Russell King - ARM Linux admin
2021-01-05 19:50     ` Russell King - ARM Linux admin
2021-01-06 11:53 ` Mark Rutland
2021-01-06 11:53   ` Mark Rutland
2021-01-06 12:13   ` Russell King - ARM Linux admin
2021-01-06 12:13     ` Russell King - ARM Linux admin
2021-01-06 13:52   ` Russell King - ARM Linux admin
2021-01-06 17:20     ` Will Deacon
2021-01-06 17:20       ` Will Deacon
2021-01-06 17:46       ` Russell King - ARM Linux admin
2021-01-06 17:46         ` Russell King - ARM Linux admin
2021-01-06 21:04       ` Arnd Bergmann
2021-01-06 21:04         ` Arnd Bergmann
2021-01-06 22:00         ` Arnd Bergmann
2021-01-06 22:00           ` Arnd Bergmann
2021-01-06 22:32       ` Russell King - ARM Linux admin
2021-01-06 22:32         ` Russell King - ARM Linux admin
2021-01-07 11:18         ` Russell King - ARM Linux admin
2021-01-07 11:18           ` Russell King - ARM Linux admin
2021-01-07 12:45           ` Russell King - ARM Linux admin
2021-01-07 12:45             ` Russell King - ARM Linux admin
2021-01-07 13:16             ` Arnd Bergmann
2021-01-07 13:16               ` Arnd Bergmann
2021-01-07 13:37               ` Russell King - ARM Linux admin
2021-01-07 13:37                 ` Russell King - ARM Linux admin
2021-01-07 16:27                 ` Theodore Ts'o
2021-01-07 16:27                   ` Theodore Ts'o
2021-01-07 17:00                   ` Florian Weimer
2021-01-07 17:00                     ` Florian Weimer
2021-01-07 21:48                   ` Arnd Bergmann
2021-01-07 21:48                     ` Arnd Bergmann
2021-01-07 22:14                     ` Russell King - ARM Linux admin
2021-01-07 22:14                       ` Russell King - ARM Linux admin
2021-01-07 22:41                       ` Eric Biggers
2021-01-07 22:41                         ` Eric Biggers
2021-01-08  8:21                         ` Ard Biesheuvel
2021-01-08  8:21                           ` Ard Biesheuvel
2021-01-07 22:27                     ` Eric Biggers
2021-01-07 22:27                       ` Eric Biggers
2021-01-07 23:53                       ` Darrick J. Wong
2021-01-07 23:53                         ` Darrick J. Wong
2021-01-08  8:05                         ` Arnd Bergmann
2021-01-08  8:05                           ` Arnd Bergmann
2021-01-08  9:13                   ` Peter Zijlstra
2021-01-08  9:13                     ` Peter Zijlstra
2021-01-08 10:31                   ` Pavel Machek
2021-01-08 10:31                     ` Pavel Machek
2021-01-07 21:20                 ` Arnd Bergmann [this message]
2021-01-07 21:20                   ` Arnd Bergmann
2021-01-08  9:21                   ` Peter Zijlstra
2021-01-08  9:21                     ` Peter Zijlstra
2021-01-08  9:26                     ` Will Deacon
2021-01-08  9:26                       ` Will Deacon
2021-01-08 20:02                       ` Linus Torvalds
2021-01-08 20:02                         ` Linus Torvalds
2021-01-08 20:22                         ` Arnd Bergmann
2021-01-08 20:22                           ` Arnd Bergmann
2021-01-08 21:20                           ` Nick Desaulniers
2021-01-08 21:20                             ` Nick Desaulniers
2021-01-08 20:29                         ` Russell King - ARM Linux admin
2021-01-08 20:29                           ` Russell King - ARM Linux admin
2021-01-12 13:20                         ` Lukas Wunner
2021-01-12 13:31                           ` Florian Weimer
2021-01-12 13:31                             ` Florian Weimer
2021-01-12 13:46                             ` David Laight
2021-01-12 13:46                               ` David Laight
2021-01-12 17:28                           ` Linus Torvalds
2021-01-12 17:28                             ` Linus Torvalds
2021-01-14 13:13                             ` Lukas Wunner

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