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authorNicholas Piggin <npiggin@gmail.com>2016-12-20 04:30:05 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2017-04-28 21:02:25 +1000
commitc4f3b52ce7b16824befb16ab3d045c891b08b7db (patch)
tree92f77ba25144dbe046368583e18e21c83015e642 /arch/powerpc/xmon
parenta3d96f70c14773d0928c6a54fd278138f0868572 (diff)
powerpc/64s: Disallow system reset vs system reset reentrancy
In preparation for using a dedicated stack for system reset interrupts, prevent a nested system reset from recovering, in order to simplify code that is called in crash/debug path. This allows a system reset interrupt to just use the base stack pointer. Keep an in_nmi nesting counter similarly to the in_mce counter. Consider the interrrupt non-recoverable if it is taken inside another system reset. Interrupt nesting could be allowed similarly to MCE, but system reset is a special case that's not for normal operation, so simplicity wins until there is requirement for nested system reset interrupts. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/xmon')
-rw-r--r--arch/powerpc/xmon/xmon.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 2b21e90fff8d..99348a2961b8 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -2236,6 +2236,7 @@ static void dump_one_paca(int cpu)
DUMP(p, emergency_sp, "p");
#ifdef CONFIG_PPC_BOOK3S_64
DUMP(p, mc_emergency_sp, "p");
+ DUMP(p, in_nmi, "x");
DUMP(p, in_mce, "x");
DUMP(p, hmi_event_available, "x");
#endif