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Date:   Wed, 20 Jan 2021 11:56:37 +0100
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Will Deacon <will@kernel.org>
Cc:     stable@vger.kernel.org, linux-kernel@vger.kernel.org,
        Russell King <linux@armlinux.org.uk>,
        Arnd Bergmann <arnd@kernel.org>,
        Nathan Chancellor <natechancellor@gmail.com>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Theodore Ts'o <tytso@mit.edu>,
        Florian Weimer <fweimer@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [STABLE BACKPORT 4.19.y and 5.14.y] compiler.h: Raise minimum
 version of GCC to 5.1 for arm64
Message-ID: <YAgMZWAyaDs3CT+o@kroah.com>
References: <20210118135700.17447-1-will@kernel.org>
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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@armlinux.org.uk>
> Suggested-by: Arnd Bergmann <arnd@kernel.org>
> Signed-off-by: Will Deacon <will@kernel.org>
> Tested-by: Nathan Chancellor <natechancellor@gmail.com>
> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
> Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: <stable@vger.kernel.org> # 4.19.y and 5.4.y only

All now queued up, thanks!

greg k-h