netdev - Re: [PATCH net 1/2] s390/bpf: fix stack allocation

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Message-Id: <20150603.193204.215182154047808316.davem@davemloft.net>
Date:	Wed, 03 Jun 2015 19:32:04 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ast@...mgrid.com
Cc:	holzheu@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, daniel@...earbox.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH net 1/2] s390/bpf: fix stack allocation

From: Alexei Starovoitov <ast@...mgrid.com>
Date: Mon,  1 Jun 2015 22:48:34 -0700

> From: Michael Holzheu <holzheu@...ux.vnet.ibm.com>
> 
> On s390x we have to provide 160 bytes stack space before we can call
> the next function. From the 160 bytes that we got from the previous
> function we only use 11 * 8 bytes and have 160 - 11 * 8 bytes left.
> Currently for BPF we allocate additional 160 - 11 * 8 bytes for the
> next function. This is wrong because then the next function only gets:
> 
>  (160 - 11 * 8) + (160 - 11 * 8) = 2 * 72 = 144 bytes
> 
> Fix this and allocate enough memory for the next function.
> 
> Fixes: 054623105728 ("s390/bpf: Add s390x eBPF JIT compiler backend")
> Signed-off-by: Michael Holzheu <holzheu@...ux.vnet.ibm.com>
> Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>
> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>

Applied.
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