From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: linux-mm@kvack.org, Cristopher Lameter <cl@linux.com>,
Andrew Morton <akpm@linux-foundation.org>,
Alexei Starovoitov <ast@kernel.org>,
netdev@vger.kernel.org, Daniel Borkmann <daniel@iogearbox.net>
Subject: Re: [PATCH 1/2] bpf: do not use KMALLOC_SHIFT_MAX
Date: Fri, 16 Dec 2016 15:23:42 -0800 [thread overview]
Message-ID: <20161216232340.GA99159@ast-mbp.thefacebook.com> (raw)
In-Reply-To: <20161216220235.GD7645@dhcp22.suse.cz>
On Fri, Dec 16, 2016 at 11:02:35PM +0100, Michal Hocko wrote:
> On Fri 16-12-16 10:02:10, Alexei Starovoitov wrote:
> > On Thu, Dec 15, 2016 at 05:47:21PM +0100, Michal Hocko wrote:
> > > From: Michal Hocko <mhocko@suse.com>
> > >
> > > 01b3f52157ff ("bpf: fix allocation warnings in bpf maps and integer
> > > overflow") has added checks for the maximum allocateable size. It
> > > (ab)used KMALLOC_SHIFT_MAX for that purpose. While this is not incorrect
> > > it is not very clean because we already have KMALLOC_MAX_SIZE for this
> > > very reason so let's change both checks to use KMALLOC_MAX_SIZE instead.
> > >
> > > Cc: Alexei Starovoitov <ast@kernel.org>
> > > Signed-off-by: Michal Hocko <mhocko@suse.com>
> >
> > Nack until the patches 1 and 2 are reversed.
>
> I do not insist on ordering. The thing is that it shouldn't matter all
> that much. Or are you worried about bisectability?
This patch 1 strongly depends on patch 2 !
Therefore order matters.
The patch 1 by itself is broken.
The commit log is saying
'(ab)used KMALLOC_SHIFT_MAX for that purpose .. use KMALLOC_MAX_SIZE instead'
that is also incorrect. We cannot do that until KMALLOC_MAX_SIZE is fixed.
So please change the order and fix the commit log to say that KMALLOC_MAX_SIZE
is actually valid limit now.
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next prev parent reply other threads:[~2016-12-16 23:23 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-15 16:47 [PATCH 0/2] mm, slab: consolidate KMALLOC_MAX_SIZE Michal Hocko
2016-12-15 16:47 ` [PATCH 1/2] bpf: do not use KMALLOC_SHIFT_MAX Michal Hocko
2016-12-15 19:06 ` Christoph Lameter
2016-12-16 18:02 ` Alexei Starovoitov
2016-12-16 22:02 ` Michal Hocko
2016-12-16 23:23 ` Alexei Starovoitov [this message]
2016-12-16 23:39 ` Michal Hocko
2016-12-17 0:28 ` Alexei Starovoitov
2016-12-17 8:27 ` Michal Hocko
2016-12-16 23:40 ` Daniel Borkmann
2016-12-15 16:47 ` [PATCH 2/2] mm, slab: make sure that KMALLOC_MAX_SIZE will fit into MAX_ORDER Michal Hocko
2016-12-15 19:11 ` Christoph Lameter
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