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authorNoam Camus <noamc@ezchip.com>2013-09-12 13:07:39 +0530
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-12 07:40:08 -0700
commitc3567f8a359b7917dcffa442301f88ed0a75211f (patch)
tree0bf6687e01b7d9eabd7b096e64bbb2d8a6c2bf15 /arch/arc/kernel/head.S
parentd5d04bb48f0eb89c14e76779bb46212494de0bec (diff)
downloadblackbird-op-linux-c3567f8a359b7917dcffa442301f88ed0a75211f.tar.gz
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ARC: SMP failed to boot due to missing IVT setup
Commit 05b016ecf5e7a "ARC: Setup Vector Table Base in early boot" moved the Interrupt vector Table setup out of arc_init_IRQ() which is called for all CPUs, to entry point of boot cpu only, breaking booting of others. Fix by adding the same to entry point of non-boot CPUs too. read_arc_build_cfg_regs() printing IVT Base Register didn't help the casue since it prints a synthetic value if zero which is totally bogus, so fix that to print the exact Register. [vgupta: Remove the now stale comment from header of arc_init_IRQ and also added the commentary for halt-on-reset] Cc: Gilad Ben-Yossef <gilad@benyossef.com> Cc: Cc: <stable@vger.kernel.org> #3.11 Signed-off-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arc/kernel/head.S')
-rw-r--r--arch/arc/kernel/head.S5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S
index 2a913f85a747..0f944f024513 100644
--- a/arch/arc/kernel/head.S
+++ b/arch/arc/kernel/head.S
@@ -34,6 +34,9 @@ stext:
; IDENTITY Reg [ 3 2 1 0 ]
; (cpu-id) ^^^ => Zero for UP ARC700
; => #Core-ID if SMP (Master 0)
+ ; Note that non-boot CPUs might not land here if halt-on-reset and
+ ; instead breath life from @first_lines_of_secondary, but we still
+ ; need to make sure only boot cpu takes this path.
GET_CPU_ID r5
cmp r5, 0
jnz arc_platform_smp_wait_to_boot
@@ -98,6 +101,8 @@ stext:
first_lines_of_secondary:
+ sr @_int_vec_base_lds, [AUX_INTR_VEC_BASE]
+
; setup per-cpu idle task as "current" on this CPU
ld r0, [@secondary_idle_tsk]
SET_CURR_TASK_ON_CPU r0, r1
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