linux-kernel - Re: [PATCH 22/24] uaccess: add memzero

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Message-ID: <20200520205037.GB23230@ZenIV.linux.org.uk>
Date:   Wed, 20 May 2020 21:50:37 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, vkuznets@...hat.com,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 22/24] uaccess: add memzero_user

On Wed, May 20, 2020 at 01:40:36PM -0700, Christoph Hellwig wrote:
> On Wed, May 20, 2020 at 01:21:43PM -0400, Paolo Bonzini wrote:
> > +			unsafe_put_user(val, (unsigned long __user *) from, err_fault);
> 
> This adds a way too long line.  In many ways it would be much nicer if
> you used an unsigned long __user * variable internally, a that would
> remove all these crazy casts and actually make the code readable.

Er...  what's wrong with clear_user(), anyway?