powerpc/64s/exceptions: Machine check reconcile irq state
pseries fwnmi machine check code pops the soft-irq checks in rtas_call
(after the next patch to remove rtas_token from this call path).
Rather than play whack a mole with these and forever having fragile
code, it seems better to have the early machine check handler perform
the same kind of reconcile as the other NMI interrupts.
WARNING: CPU: 0 PID: 493 at arch/powerpc/kernel/irq.c:343
CPU: 0 PID: 493 Comm: a Tainted: G W
NIP:
c00000000001ed2c LR:
c000000000042c40 CTR:
0000000000000000
REGS:
c0000001fffd38b0 TRAP: 0700 Tainted: G W
MSR:
8000000000021003 <SF,ME,RI,LE> CR:
28000488 XER:
00000000
CFAR:
c00000000001ec90 IRQMASK: 0
GPR00:
c000000000043820 c0000001fffd3b40 c0000000012ba300 0000000000000000
GPR04:
0000000048000488 0000000000000000 0000000000000000 00000000deadbeef
GPR08:
0000000000000080 0000000000000000 0000000000000000 0000000000001001
GPR12:
0000000000000000 c0000000014a0000 0000000000000000 0000000000000000
GPR16:
0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20:
0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR24:
0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR28:
0000000000000000 0000000000000001 c000000001360810 0000000000000000
NIP [
c00000000001ed2c] arch_local_irq_restore.part.0+0xac/0x100
LR [
c000000000042c40] unlock_rtas+0x30/0x90
Call Trace:
[
c0000001fffd3b40] [
c000000001360810] 0xc000000001360810 (unreliable)
[
c0000001fffd3b60] [
c000000000043820] rtas_call+0x1c0/0x280
[
c0000001fffd3bb0] [
c0000000000dc328] fwnmi_release_errinfo+0x38/0x70
[
c0000001fffd3c10] [
c0000000000dcd8c] pseries_machine_check_realmode+0x1dc/0x540
[
c0000001fffd3cd0] [
c00000000003fe04] machine_check_early+0x54/0x70
[
c0000001fffd3d00] [
c000000000008384] machine_check_early_common+0x134/0x1f0
--- interrupt: 200 at 0x13f1307c8
LR = 0x7fff888b8528
Instruction dump:
60000000 7d2000a6 71298000 41820068 39200002 7d210164 4bffff9c 60000000
60000000 7d2000a6 71298000 4c820020 <
0fe00000>
4e800020 60000000 60000000
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200508043408.886394-5-npiggin@gmail.com