linux-kernel - Re: [PATCH 8/9] RISC-V: User-facing API

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Date:   Wed, 28 Jun 2017 23:52:45 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Palmer Dabbelt <palmer@...belt.com>
cc:     peterz@...radead.org, mingo@...hat.com, mcgrof@...nel.org,
        viro@...iv.linux.org.uk, sfr@...b.auug.org.au,
        nicolas.dichtel@...nd.com, rmk+kernel@...linux.org.uk,
        msalter@...hat.com, tklauser@...tanz.ch, will.deacon@....com,
        james.hogan@...tec.com, paul.gortmaker@...driver.com,
        linux@...ck-us.net, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, albert@...ive.com
Subject: Re: [PATCH 8/9] RISC-V: User-facing API

On Wed, 28 Jun 2017, Thomas Gleixner wrote:
> On Wed, 28 Jun 2017, Palmer Dabbelt wrote:
> > +	err = __get_user(prev, ptr);
> 
> Sigh. Type safety is overrated, right?

But the comment above your __get_user() implementation says:

+ * @ptr must have pointer-to-simple-variable type, and the result of
+ * dereferencing @ptr must be assignable to @x without a cast.