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| author | Nicholas Piggin <npiggin@gmail.com> | 2016-12-19 19:30:06 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-28 13:02:25 +0200 |
| commit | b1ee8a3de5790777f325416ad97340428d8ae25f (patch) | |
| tree | 7fb570821268ff0eab738759eb345b85bc7df179 /arch/powerpc/xmon | |
| parent | powerpc/64s: Disallow system reset vs system reset reentrancy (diff) | |
| download | linux-b1ee8a3de5790777f325416ad97340428d8ae25f.tar.xz linux-b1ee8a3de5790777f325416ad97340428d8ae25f.zip | |
powerpc/64s: Dedicated system reset interrupt stack
The system reset interrupt is used for crash/debug situations, so it is
desirable to have as little impact on the normal state of the system as
possible.
Currently it uses the current kernel stack to process the exception.
This stores into the stack which may be involved with the crash. The
stack pointer may be corrupted, or it may have overflowed.
Avoid or minimise these problems by creating a dedicated NMI stack for
the system reset interrupt to use.
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.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index 99348a2961b8..682506821bba 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -2235,6 +2235,7 @@ static void dump_one_paca(int cpu) DUMP(p, kernel_msr, "lx"); DUMP(p, emergency_sp, "p"); #ifdef CONFIG_PPC_BOOK3S_64 + DUMP(p, nmi_emergency_sp, "p"); DUMP(p, mc_emergency_sp, "p"); DUMP(p, in_nmi, "x"); DUMP(p, in_mce, "x"); |