linux-kernel - Re: [PATCH net 3/3] bpf: do not test for PCPU_MIN_UNIT

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Message-ID: <20171017155507.d7i6bzwnfchtztws@ast-mbp.dhcp.thefacebook.com>
Date:   Tue, 17 Oct 2017 08:55:09 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     davem@...emloft.net, tj@...nel.org, ast@...nel.org,
        john.fastabend@...il.com, mark.rutland@....com, richard@....at,
        sp3485@...umbia.edu, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 3/3] bpf: do not test for PCPU_MIN_UNIT_SIZE before
 percpu allocations

On Tue, Oct 17, 2017 at 04:55:54PM +0200, Daniel Borkmann wrote:
> PCPU_MIN_UNIT_SIZE is an implementation detail of the percpu
> allocator. Given we support __GFP_NOWARN now, lets just let
> the allocation request fail naturally instead. The two call
> sites from BPF mistakenly assumed __GFP_NOWARN would work, so
> no changes needed to their actual __alloc_percpu_gfp() calls
> which use the flag already.
> 
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>

Acked-by: Alexei Starovoitov <ast@...nel.org>