linux-kernel - Re: [PATCH 1/6] powerpc/spufs: simplify spufs core dumping

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Date:   Tue, 07 Apr 2020 08:01:16 +0800
From:   Jeremy Kerr <jk@...abs.org>
To:     Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...ts.ozlabs.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] powerpc/spufs: simplify spufs core dumping

Hi Christoph,

> Replace the coredump ->read method with a ->dump method that must call
> dump_emit itself.  That way we avoid a buffer allocation an messing with
> set_fs() to call into code that is intended to deal with user buffers.
> For the ->get case we can now use a small on-stack buffer and avoid
> memory allocations as well.

That looks much better, thanks!

Reviewed-by: Jeremy Kerr <jk@...abs.org>

However, I no longer have access to hardware to test this on. Michael,
are the coredump tests in spufs-testsuite still alive?

Cheers,


Jeremy