linux-kernel - Re: [STABLE BACKPORT 4.19.y and 5.14.y] compiler.h: Raise minimum version of GCC to 5.1 for arm64

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Date:   Wed, 20 Jan 2021 11:56:37 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Will Deacon <will@...nel.org>
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Theodore Ts'o <tytso@....edu>,
        Florian Weimer <fweimer@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [STABLE BACKPORT 4.19.y and 5.14.y] compiler.h: Raise minimum
 version of GCC to 5.1 for arm64

On Mon, Jan 18, 2021 at 01:57:00PM +0000, Will Deacon wrote:
> commit dca5244d2f5b94f1809f0c02a549edf41ccd5493 upstream.
> 
> GCC versions >= 4.9 and < 5.1 have been shown to emit memory references
> beyond the stack pointer, resulting in memory corruption if an interrupt
> is taken after the stack pointer has been adjusted but before the
> reference has been executed. This leads to subtle, infrequent data
> corruption such as the EXT4 problems reported by Russell King at the
> link below.
> 
> Life is too short for buggy compilers, so raise the minimum GCC version
> required by arm64 to 5.1.
> 
> Reported-by: Russell King <linux@...linux.org.uk>
> Suggested-by: Arnd Bergmann <arnd@...nel.org>
> Signed-off-by: Will Deacon <will@...nel.org>
> Tested-by: Nathan Chancellor <natechancellor@...il.com>
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Reviewed-by: Nathan Chancellor <natechancellor@...il.com>
> Acked-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: <stable@...r.kernel.org> # 4.19.y and 5.4.y only

All now queued up, thanks!

greg k-h