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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: benh@kernel.crashing.org, paulus@samba.org
Subject: Re: [PATCH] powerpc: subpage_protect: Increase the array size to take
 care of 64TB
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Date: Wed, 06 Aug 2014 16:08:06 +0530
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"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> writes:

> We now support TASK_SIZE of 16TB, hence the array should be 8.
>
> Fixes the below crash:
>
> Unable to handle kernel paging request for data at address 0x000100bd
> Faulting instruction address: 0xc00000000004f914
> cpu 0x13: Vector: 300 (Data Access) at [c000000fea75fa90]
>     pc: c00000000004f914: .sys_subpage_prot+0x2d4/0x5c0
>     lr: c00000000004fb5c: .sys_subpage_prot+0x51c/0x5c0
>     sp: c000000fea75fd10
>    msr: 9000000000009032
>    dar: 100bd
>  dsisr: 40000000
>   current = 0xc000000fea6ae490
>   paca    = 0xc00000000fb8ab00   softe: 0        irq_happened: 0x00
>     pid   = 8237, comm = a.out
> enter ? for help
> [c000000fea75fe30] c00000000000a164 syscall_exit+0x0/0x98
> --- Exception: c00 (System Call) at 00003fff89737004
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

This should go to stable also. Merged upstream as
dad6f37c2602e4af6c3aecfdb41f2d8bd4668163. Let me know how it should be
handled.

-aneesh