linux-kernel - Re: [PATCH] mm: vmalloc: Use the vmap_area_lock to protect ne_fit_preload

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Message-ID: <20191007162330.GA26503@pc636>
Date:   Mon, 7 Oct 2019 18:23:30 +0200
From:   Uladzislau Rezki <urezki@...il.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Daniel Wagner <dwagner@...e.de>,
        Uladzislau Rezki <urezki@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: vmalloc: Use the vmap_area_lock to protect
 ne_fit_preload_node

Hello, Daniel, Sebastian.

> > On Fri, Oct 04, 2019 at 06:30:42PM +0200, Sebastian Andrzej Siewior wrote:
> > > On 2019-10-04 18:20:41 [+0200], Uladzislau Rezki wrote:
> > > > If we have migrate_disable/enable, then, i think preempt_enable/disable
> > > > should be replaced by it and not the way how it has been proposed
> > > > in the patch.
> > > 
> > > I don't think this patch is appropriate for upstream.
> > 
> > Yes, I agree. The discussion made this clear, this is only for -rt
> > trees. Initially I though this should be in mainline too.
> 
> Sorry, this was _before_ Uladzislau pointed out that you *just* moved
> the lock that was there from the beginning. I missed that while looking
> over the patch. Based on that I don't think that this patch is not
> appropriate for upstream.
> 
Yes that is a bit messy :) Then i do not see what that patch fixes in
mainline? Instead it will just add an extra blocking, i did not want that
therefore used preempt_enable/disable. But, when i saw this patch i got it
as a preparation of PREEMPT_RT merging work.

--
Vlad Rezki