linux-kernel - Re: [v5 3/6] powerpc/memcpy: Add memcpy

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Message-Id: <1562838505.oes5qb0f1o.astroid@bobo.none>
Date:   Thu, 11 Jul 2019 19:50:05 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     linux-kernel@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Santosh Sivaraj <santosh@...six.org>
Cc:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Reza Arbab <arbab@...ux.ibm.com>,
        Balbir Singh <bsingharora@...il.com>,
        Chandan Rajendra <chandan@...ux.vnet.ibm.com>,
        christophe leroy <christophe.leroy@....fr>,
        Mahesh Salgaonkar <mahesh@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [v5 3/6] powerpc/memcpy: Add memcpy_mcsafe for pmem

Santosh Sivaraj's on July 9, 2019 10:15 pm:
> From: Balbir Singh <bsingharora@...il.com>
> 
> The pmem infrastructure uses memcpy_mcsafe in the pmem layer so as to
> convert machine check exceptions into a return value on failure in case
> a machine check exception is encountered during the memcpy. The return
> value is the number of bytes remaining to be copied.
> 
> This patch largely borrows from the copyuser_power7 logic and does not add
> the VMX optimizations, largely to keep the patch simple. If needed those
> optimizations can be folded in.

Shouldn't this patch go after the exception table stuff now if you
squashed them together?

Thanks,
Nick