linux-kernel - Re: [PATCH v2 08/35] nds32: Process management

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Message-ID: <20171207164506.GE21978@ZenIV.linux.org.uk>
Date:   Thu, 7 Dec 2017 16:45:06 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Greentime Hu <green.hu@...il.com>
Cc:     greentime@...estech.com, linux-kernel@...r.kernel.org,
        arnd@...db.de, linux-arch@...r.kernel.org, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com, robh+dt@...nel.org,
        netdev@...r.kernel.org, deanbo422@...il.com,
        devicetree@...r.kernel.org, dhowells@...hat.com,
        will.deacon@....com, daniel.lezcano@...aro.org,
        linux-serial@...r.kernel.org, Vincent Chen <vincentc@...estech.com>
Subject: Re: [PATCH v2 08/35] nds32: Process management

On Mon, Nov 27, 2017 at 08:27:55PM +0800, Greentime Hu wrote:

> +#define start_thread(regs,pc,stack)			\
> +({							\
> +	set_fs(USER_DS);				\

Not the job of start_thread() - its users (->load_binary() methods of
assorted binfmt) must (and do) call flush_old_exec() first.  And
that will switch to USER_DS just fine.