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| author | Nicholas Piggin <npiggin@gmail.com> | 2016-12-20 04:30:05 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-28 21:02:25 +1000 |
| commit | c4f3b52ce7b16824befb16ab3d045c891b08b7db (patch) | |
| tree | 92f77ba25144dbe046368583e18e21c83015e642 /arch/powerpc/include/asm/paca.h | |
| parent | a3d96f70c14773d0928c6a54fd278138f0868572 (diff) | |
| download | lwn-c4f3b52ce7b16824befb16ab3d045c891b08b7db.tar.gz lwn-c4f3b52ce7b16824befb16ab3d045c891b08b7db.zip | |
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/include/asm/paca.h')
| -rw-r--r-- | arch/powerpc/include/asm/paca.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h index 601e2327dd8c..b1197c1affac 100644 --- a/arch/powerpc/include/asm/paca.h +++ b/arch/powerpc/include/asm/paca.h @@ -187,12 +187,15 @@ struct paca_struct { #ifdef CONFIG_PPC_BOOK3S_64 /* Exclusive emergency stack pointer for machine check exception. */ void *mc_emergency_sp; + + u16 in_nmi; /* In nmi handler */ + /* * Flag to check whether we are in machine check early handler * and already using emergency stack. */ u16 in_mce; - u8 hmi_event_available; /* HMI event is available */ + u8 hmi_event_available; /* HMI event is available */ #endif /* Stuff for accurate time accounting */ |