linux-kernel - RE: [PATCH 4/4] mm: vmalloc: convert vread() to vread

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Date:   Sun, 19 Mar 2023 22:28:12 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Matthew Wilcox' <willy@...radead.org>,
        Lorenzo Stoakes <lstoakes@...il.com>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Baoquan He <bhe@...hat.com>,
        Uladzislau Rezki <urezki@...il.com>,
        "David Hildenbrand" <david@...hat.com>,
        Liu Shixin <liushixin2@...wei.com>,
        "Jiri Olsa" <jolsa@...nel.org>
Subject: RE: [PATCH 4/4] mm: vmalloc: convert vread() to vread_iter()

From: Matthew Wilcox
> Sent: 19 March 2023 02:51
> 
> On Sun, Mar 19, 2023 at 12:20:12AM +0000, Lorenzo Stoakes wrote:
> >  /* for /proc/kcore */
> > -extern long vread(char *buf, char *addr, unsigned long count);
> > +extern long vread_iter(char *addr, size_t count, struct iov_iter *iter);
> 
> I don't love the order of the arguments here.  Usually we follow
> memcpy() and have (dst, src, len).  This sometimes gets a bit more
> complex when either src or dst need two arguments, but that's not the
> case here.

And, if 'addr' is the source (which Matthew's comment implies)
it ought to be 'const char *' (or probably even 'const void *').

	David

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