linux-kernel - Re: [RFC PATCH 5/8] mm: Pass 'address' to map to do_set_pte() and drop FAULT_FLAG

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Message-ID: <20210115102414.GB14167@willie-the-truck>
Date:   Fri, 15 Jan 2021 10:24:15 +0000
From:   Will Deacon <will@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Jan Kara <jack@...e.cz>, Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Hugh Dickins <hughd@...gle.com>,
        Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [RFC PATCH 5/8] mm: Pass 'address' to map to do_set_pte() and
 drop FAULT_FLAG_PREFAULT

On Thu, Jan 14, 2021 at 10:17:22AM -0800, Linus Torvalds wrote:
> On Thu, Jan 14, 2021 at 10:01 AM Will Deacon <will@...nel.org> wrote:
> >
> > Rather than modifying the 'address' field of the 'struct vm_fault_info'
> > passed to do_set_pte(), leave that to identify the real faulting address
> > and pass in the virtual address to be mapped by the new pte as a
> > separate argument.
> 
> Ack.
> 
> In fact - apart from the question I had about the 'info' sub-structure
> - ack on the whole series. But this one struck me particularly as
> "that's simpler and clearer" even if that finish_fault() case is now
> not as pretty (but with an unnamed structure it would be slightly
> simpler, at least).

Thanks. I'll post another spin next week to avoid the named structure, but
if you (or anybody else) get a chance to glance over some of the other
things I mentioned in the cover letter beforehand that would be really
great.

Cheers,

Will