linux-kernel - Re: [PATCH] mm/vmalloc: Separate put pages and flush VM flags

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Date:   Thu, 21 Jan 2021 23:57:47 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "willy@...radead.org" <willy@...radead.org>
CC:     "hch@....de" <hch@....de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "dja@...ens.net" <dja@...ens.net>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm/vmalloc: Separate put pages and flush VM flags

On Thu, 2021-01-21 at 13:19 +0000, Matthew Wilcox wrote:
> On Wed, Jan 20, 2021 at 05:41:18PM -0800, Rick Edgecombe wrote:
> > When VM_MAP_PUT_PAGES was added, it was defined with the same value
> > as
> > VM_FLUSH_RESET_PERMS. This doesn't seem like it will cause any big
> > functional problems other than some excess flushing for
> > VM_MAP_PUT_PAGES
> > allocations.
> > 
> > Redefine VM_MAP_PUT_PAGES to have its own value. Also, move the
> > comment
> > and remove whitespace for VM_KASAN such that the flags lower down
> > are less
> > likely to be missed in the future.
> 
> Er ... I think the problem was that VM_FLUSH_RESET_PERMS was put away
> from
> all the other flags!

Well it wasn't that far away at the time, the VM_KASAN comment and
whitespace got added later. But yes not ideal.

> Why not this?

128 char line, but looks better to me.