diff options
| author | Michael Ellerman <mpe@ellerman.id.au> | 2021-02-03 00:02:06 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-02-09 01:10:16 +1100 |
| commit | 0ecf6a9e47d825b7dddfebca738386b809e59a94 (patch) | |
| tree | e3074c3b0caa3e00e4f053caf4879296702319ca /arch/powerpc/kernel/exceptions-64s.S | |
| parent | 73287caa9210ded6066833195f4335f7f688a46b (diff) | |
powerpc/64: Make stack tracing work during very early boot
If we try to stack trace very early during boot, either due to a
WARN/BUG or manual dump_stack(), we will oops in
valid_emergency_stack() when we try to dereference the paca_ptrs
array.
The fix is simple, we just return false if paca_ptrs isn't allocated
yet. The stack pointer definitely isn't part of any emergency stack
because we haven't allocated any yet.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210202130207.1303975-1-mpe@ellerman.id.au
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64s.S')
0 files changed, 0 insertions, 0 deletions