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To: Ian Munsie <imunsie@au1.ibm.com>, Michael Ellerman <michaele@au1.ibm.com>,
 Christophe Lombard <clombard@linux.vnet.ibm.com>
From: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev <linuxppc-dev@ozlabs.org>, Michael Neuling <mikey@neuling.org>,
 Ian Munsie <imunsie@au1.ibm.com>, stable <stable@vger.kernel.org>
Subject: Re: cxl: Fix number of allocated pages in SPA
Message-Id: <20151007101055.BDE1D140D68@ozlabs.org>
Date: Wed,  7 Oct 2015 21:10:55 +1100 (AEDT)
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On Wed, 2015-07-10 at 05:07:40 UTC, Ian Munsie wrote:
> From: Christophe Lombard <clombard@linux.vnet.ibm.com>
> 
> The scheduled process area is currently allocated before assigning the
> correct maximum processes to the AFU, which will mean we only ever
> allocate a fixed number of pages for the scheduled process area. This
> will limit us to 958 processes with 2 x 64K pages. If we try to use more
> processes than that we'd probably overrun the buffer and corrupt memory
> or crash.
> 
> AFUs that require three or more interrupts per process will not be
> affected as they are already limited to less processes than that, but we
> could hit it on an AFU that requires 0, 1 or 2 interrupts per process,
> or when using 4K pages.
> 
> This patch moves the initialisation of the num_procs to before the SPA
> allocation so that enough pages will be allocated for the number of
> processes that the AFU supports.
> 
> Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
> Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
> Cc: stable <stable@vger.kernel.org> # 3.18+

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/4108efb02daa09cbb5db048a

cheers