ARC: Re-enable MMU upon Machine Check exception

I recently came upon a scenario where I would get a double fault
machine check exception tiriggered by a kernel module.
However the ensuing crash stacktrace (ksym lookup) was not working
correctly.

Turns out that machine check auto-disables MMU while modules are allocated
in kernel vaddr spapce.

This patch re-enables the MMU before start printing the stacktrace
making stacktracing of modules work upon a fatal exception.

Cc: stable@kernel.org
Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Reviewed-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[vgupta: moved code into low level handler to avoid in 2 places]

diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S
index 1eea99b..85d9ea4 100644 (file)
--- a/arch/arc/kernel/entry.S
+++ b/arch/arc/kernel/entry.S
@@ -92,6 +92,12 @@ ENTRY(EV_MachineCheck)
        lr  r0, [efa]
        mov r1, sp
 
+       ; hardware auto-disables MMU, re-enable it to allow kernel vaddr
+       ; access for say stack unwinding of modules for crash dumps
+       lr      r3, [ARC_REG_PID]
+       or      r3, r3, MMU_ENABLE
+       sr      r3, [ARC_REG_PID]
+
        lsr     r3, r2, 8
        bmsk    r3, r3, 7
        brne    r3, ECR_C_MCHK_DUP_TLB, 1f

diff --git a/arch/arc/mm/tlb.c b/arch/arc/mm/tlb.c
index edc59a0..8ceefbf 100644 (file)
--- a/arch/arc/mm/tlb.c
+++ b/arch/arc/mm/tlb.c
@@ -908,9 +908,6 @@ void do_tlb_overlap_fault(unsigned long cause, unsigned long address,
 
        local_irq_save(flags);
 
-       /* re-enable the MMU */
-       write_aux_reg(ARC_REG_PID, MMU_ENABLE | read_aux_reg(ARC_REG_PID));
-
        /* loop thru all sets of TLB */
        for (set = 0; set < mmu->sets; set++) {