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Date: Thu, 7 Jan 2021 22:48:05 +0100 From: Arnd Bergmann <arnd@...nel.org> To: "Theodore Ts'o" <tytso@....edu> Cc: Russell King - ARM Linux admin <linux@...linux.org.uk>, Will Deacon <will@...nel.org>, linux-toolchains@...r.kernel.org, Mark Rutland <mark.rutland@....com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Andreas Dilger <adilger.kernel@...ger.ca>, Ext4 Developers List <linux-ext4@...r.kernel.org>, Linux ARM <linux-arm-kernel@...ts.infradead.org> Subject: Re: Aarch64 EXT4FS inode checksum failures - seems to be weak memory ordering issues On Thu, Jan 7, 2021 at 5:27 PM Theodore Ts'o <tytso@....edu> wrote: > > On Thu, Jan 07, 2021 at 01:37:47PM +0000, Russell King - ARM Linux admin wrote: > > > The gcc bugzilla mentions backports into gcc-linaro, but I do not see > > > them in my git history. > > > > So, do we raise the minimum gcc version for the kernel as a whole to 5.1 > > or just for aarch64? > > Russell, Arnd, thanks so much for tracking down the root cause of the > bug! There is one more thing that I wondered about when looking through the ext4 code: Should it just call the crc32c_le() function directly instead of going through the crypto layer? It seems that with Ard's rework from 2018, that can just call the underlying architecture specific implementation anyway. > I will note that RHEL 7 uses gcc 4.8. I personally don't have an > objections to requiring developers using RHEL 7 to have to install a > more modern gcc (since I use Debian Testing and gcc 10.2.1, myself, > and gcc 5.1 is so five years ago :-), but I could imagine that being > considered inconvenient for some. The main users of gcc-4.9 that I recall from previous discussions were Android and Debian 8, but both of them are done now: Debian 8 has reached its end of life last summer, and Android uses clang for building new kernels. Arnd
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