ux500: disable Old ABI compatibility support (OABI_COMPAT)

This patch disables support for legacy ABI binaries.
Only new ARM ABI i.e. EABI compiled user space is supported.
If legacy ABI binary is executed, results will be unpredictable.

This is done because race condition is seen in swap-out code
on SMP in following kernel panic dump -

<1>[35225.247131] Unable to handle kernel paging request at virtual address afd0c638
<1>[35225.247131] pgd = e0020000
<1>[35225.247161] [afd0c638] *pgd=2005a031, *pte=2331971d, *ppte=00000000
<0>[35225.247253] Internal error: Oops: 17 [#1] PREEMPT SMP
<6>[35225.247283] dbx500_dump notified of crash
<4>[35225.249298] PC is at vector_swi+0x28/0x88
<4>[35225.249328] LR is at 0xafd0c63c
<4>[35225.249328] pc : [<c0293828>]    lr : [<afd0c63c>]    psr: 60000093
<4>[35225.249359] sp : e013bfb0  ip : 82d08528  fp : 82d0731c
<4>[35225.249359] r10: 00000000  r9 : 47ac2738  r8 : 20000010
<4>[35225.249389] r7 : 000000a8  r6 : 00000000  r5 : 00000010  r4 : 001341d0
<4>[35225.249389] r3 : 00000001  r2 : ffffffff  r1 : 00000008  r0 : 0013421c
<4>[35225.249420] Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
<4>[35225.249420] Control: 10c57c7d  Table: 2002004a  DAC: 00000015
<4>[35225.249450]
<4>[35225.249450] PC: 0xc02937a8:
<4>[35225.249450] 37a8  e59d1040 e5bde03c e16ff001 f57ff01f e95d7fff e1a00000 e28dd00c e1b0f00e
<4>[35225.249511] 37c8  eb00f275 e1a096ad e1a09689 e5991000 e3a08001 e3110c01 0affffec e1a0100d
<4>[35225.249542] 37e8  e3a00001 eb0006f0 eaffffe8 e320f000 e320f000 e320f000 e24dd048 e88d1fff
<4>[35225.249603] 3808  e28d803c e9486000 e14f8000 e58de03c e58d8040 e58d0044 e3180020 13a0a000
<4>[35225.249664] 3828  051ea004 e59fc0ac e59cc000 ee01cf10 f1080080 e1a096ad e1a09689 e28f809c
<4>[35225.249694] 3848  e599c000 e3daa4ff 122a7609 159f8088 e92d0030 e31c0c01 1a000008 e3570e17
<4>[35225.249755] 3868  e24fee13 3798f107 e28d1008 e3a08000 e357080f e2270000 2a0010fc ea0173f0
<4>[35225.249786] 3888  e1a02007 e28d1008 e3a00000 eb0006c6 e28fe014 e1a07000 e28d1008 e3570e17
<4>[35225.249847]
<4>[35225.249847] SP: 0xe013bf30:
<4>[35225.249847] bf30  00000000 00000102 c0978064 c0322794 e013a000 00000001 00000024 c09d9cc0
<4>[35225.249908] bf50  00000000 ffffffff e013bf9c 00000000 000000a8 c02931ec 0013421c 00000008
<4>[35225.249938] bf70  ffffffff 00000001 001341d0 00000010 00000000 000000a8 20000010 47ac2738
<4>[35225.249969] bf90  00000000 82d0731c 82d08528 e013bfb0 afd0c63c c0293828 60000093 ffffffff
<4>[35225.250030] bfb0  0013421c 00000008 ffffffff 00000001 001341d0 00000010 00000000 000000a8
<4>[35225.250091] bfd0  00000000 47ac2738 00000000 82d0731c 82d08528 47ac2050 82d0340b afd0c63c
<4>[35225.250122] bff0  20000010 0013421c 40990310 d0610c09 00000000 00000001 bf000000 e00ba180
<4>[35225.250183] c010  c0999f28 00000000 00000015 c1639940 e00ba180 e013c000 c0ab67bc e1fb9720
<0>[35225.250244] Stack: (0xe013bfb0 to 0xe013c000)
<0>[35225.250274] bfa0:                                     0013421c 00000008 ffffffff 00000001
<0>[35225.250274] bfc0: 001341d0 00000010 00000000 000000a8 00000000 47ac2738 00000000 82d0731c
<0>[35225.250305] bfe0: 82d08528 47ac2050 82d0340b afd0c63c 20000010 0013421c 40990310 d0610c09
<0>[35225.250335] Code: e58d8040 e58d0044 e3180020 13a0a000 (051ea004)
<2>[35225.250366] CPU0: stopping
<4>[35225.250396] [<c029a84c>] (unwind_backtrace+0x0/0xf0) from [<c0776c88>] (dump_stack+0x10/0x24)
<4>[35225.250427] [<c0776c88>] (dump_stack+0x10/0x24) from [<c0292304>] (do_IPI+0xc8/0x164)
<4>[35225.250457] [<c0292304>] (do_IPI+0xc8/0x164) from [<c029324c>] (__irq_svc+0x4c/0xe4)
<4>[35225.250457] Exception stack(0xc0977ed8 to 0xc0977f20)
<4>[35225.250488] 7ec0:                                                       c09deb84 00000000
<4>[35225.250488] 7ee0: 00000000 c09deb48 00000001 00000001 6b99a329 c09deb48 159c928a 00000006
<4>[35225.250518] 7f00: 6b9c6db8 000017c4 00000002 c0977f20 c02a3774 c02a3790 60000113 ffffffff
<4>[35225.250549] [<c029324c>] (__irq_svc+0x4c/0xe4) from [<c02a3790>] (enter_sleep+0x6e8/0x728)
<4>[35225.250579] [<c02a3790>] (enter_sleep+0x6e8/0x728) from [<c05d88f0>] (cpuidle_idle_call+0xb0/0x190)
<4>[35225.250610] [<c05d88f0>] (cpuidle_idle_call+0xb0/0x190) from [<c0294c98>] (cpu_idle+0x94/0xf0)
<4>[35225.250610] [<c0294c98>] (cpu_idle+0x94/0xf0) from [<c0008bd4>] (start_kernel+0x310/0x380)
<4>[35225.250640] unwind: Unknown symbol address c0008bd4
<4>[35225.250640] unwind: Index not found c0008bd4
<4>[35225.251861] ---[ end trace 58829f802d64ca85 ]---
<0>[35225.251861] Kernel panic - not syncing: Fatal exception
<4>[35225.251892] [<c029a84c>] (unwind_backtrace+0x0/0xf0) from [<c0776c88>] (dump_stack+0x10/0x24)
<4>[35225.251922] [<c0776c88>] (dump_stack+0x10/0x24) from [<c0776d08>] (panic+0x6c/0x1ac)
<4>[35225.251953] [<c0776d08>] (panic+0x6c/0x1ac) from [<c02979d4>] (die+0x1b0/0x1f8)
<4>[35225.251983] [<c02979d4>] (die+0x1b0/0x1f8) from [<c029da48>] (__do_kernel_fault+0x64/0x84)
<4>[35225.251983] [<c029da48>] (__do_kernel_fault+0x64/0x84) from [<c029dd10>] (do_page_fault+0x2a8/0x2cc)
<4>[35225.252014] [<c029dd10>] (do_page_fault+0x2a8/0x2cc) from [<c02924e8>] (do_DataAbort+0x34/0x94)
<4>[35225.252044] [<c02924e8>] (do_DataAbort+0x34/0x94) from [<c02931ec>] (__dabt_svc+0x4c/0x60)
<4>[35225.252044] Exception stack(0xe013bf68 to 0xe013bfb0)
<4>[35225.252044] bf60:                   0013421c 00000008 ffffffff 00000001 001341d0 00000010
<4>[35225.252075] bf80: 00000000 000000a8 20000010 47ac2738 00000000 82d0731c 82d08528 e013bfb0
<4>[35225.252075] bfa0: afd0c63c c0293828 60000093 ffffffff
<4>[35225.252105] [<c02931ec>] (__dabt_svc+0x4c/0x60) from [<c0293828>] (vector_swi+0x28/0x88)

Solution is proposed based on discussion in following
link -
http://lists.infradead.org/pipermail/linux-arm-kernel/2011-January/038059.html

ST-Ericsson ID: 408168
ST-Ericsson Linux next: NA
ST-Ericsson FOSS-OUT ID: Trivial

Change-Id: Ief923b60fd4cb93ce96af1a6af87ade691ec6770
Signed-off-by: Shreshtha Kumar Sahu <shreshthakumar.sahu@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/44267
Reviewed-by: Rabin VINCENT <rabin.vincent@stericsson.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/arm/configs/u8500_defconfig b/arch/arm/configs/u8500_defconfig
index 47fa8cfbabd..c6a1a58850a 100755
--- a/arch/arm/configs/u8500_defconfig
+++ b/arch/arm/configs/u8500_defconfig
@@ -42,6 +42,7 @@ CONFIG_SMP=y
 CONFIG_NR_CPUS=2
 CONFIG_PREEMPT=y
 CONFIG_AEABI=y
+# CONFIG_OABI_COMPAT is not set
 CONFIG_HIGHMEM=y
 CONFIG_CMDLINE="root=/dev/ram0 init=init rw console=ttyAMA2,115200n8 mem=256M initrd=0x800000,72M"
 CONFIG_KEXEC=y