linux-kernel - Re: [PATCH] x86/mm: Pre-allocate p4d/pud pages for vmalloc area

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Message-ID: <20200626113215.GG117543@hirez.programming.kicks-ass.net>
Date:   Fri, 26 Jun 2020 13:32:15 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Joerg Roedel <jroedel@...e.de>
Cc:     Joerg Roedel <joro@...tes.org>, x86@...nel.org, hpa@...or.com,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] x86/mm: Pre-allocate p4d/pud pages for vmalloc area

On Fri, Jun 26, 2020 at 01:31:01PM +0200, Peter Zijlstra wrote:
> On Fri, Jun 26, 2020 at 01:17:11PM +0200, Joerg Roedel wrote:
> > On Fri, Jun 26, 2020 at 01:07:31PM +0200, Peter Zijlstra wrote:
> > > Can't we now remove arch_sync_kernel_mappings() from this same file?
> > 
> > Only if we panic on allocation failure.
> 
> I think we do that in plenty places already, so sure ;-)

That is, this is boot time only, right? clone() would return -ENOMEM, as
it's part of the normal page-table copy.