linux-kernel - Re: framebuffer corruption due to overlapping stp instructions on arm64

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Date:   Fri, 3 Aug 2018 10:37:29 +0100
From:   Ramana Radhakrishnan <ramana.gcc@...glemail.com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Florian Weimer <fweimer@...hat.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        GNU C Library <libc-alpha@...rceware.org>,
        Andrew Pinski <pinskia@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Russell King <linux@...linux.org.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        Mikulas Patocka <mpatocka@...hat.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: framebuffer corruption due to overlapping stp instructions on arm64

< snip>

> I guess the semantics of a framebuffer are not strictly defined, but
> the current reality is that it is expected to have memory semantics
> (by Linux/glibc)
>
> Matt is saying fundamental properties of the underlying interconnects
> (AMBA) make that impossible on ARM, but I'd like to understand better
> if that is universally the case, and whether such a system is still
> PCIe compliant.

I don't know that side of the architecture enough to make any
definitive statements.

>
> The discussion about whether memcpy() should rely on unaligned
> accesses, and whether you should use it on device memory is orthogonal
> to that, and not the heart of the matter IMO

Then maybe take libc-alpha off if it isn't relevant.

regards
Ramana