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| author | Nicholas Piggin <npiggin@gmail.com> | 2018-04-25 15:17:59 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-07-24 22:03:14 +1000 |
| commit | 5b73151fff63fb019db8171cb81c6c978533844b (patch) | |
| tree | 61c17b513c864371636878b3d47aede38661632c /arch/powerpc/include/asm | |
| parent | 9b81c0211c249c1bc8caec2ddbc86e36c550ce0f (diff) | |
| download | linux-stable-5b73151fff63fb019db8171cb81c6c978533844b.tar.gz linux-stable-5b73151fff63fb019db8171cb81c6c978533844b.tar.bz2 linux-stable-5b73151fff63fb019db8171cb81c6c978533844b.zip | |
powerpc: NMI IPI make NMI IPIs fully sychronous
There is an asynchronous aspect to smp_send_nmi_ipi. The caller waits
for all CPUs to call in to the handler, but it does not wait for
completion of the handler. This is a needless complication, so remove
it and always wait synchronously.
The synchronous wait allows the caller to easily time out and clear
the wait for completion (zero nmi_ipi_busy_count) in the case of badly
behaved handlers. This would have prevented the recent smp_send_stop
NMI IPI bug from causing the system to hang.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm')
| -rw-r--r-- | arch/powerpc/include/asm/smp.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h index 29ffaabdf75b..95b66a0c639b 100644 --- a/arch/powerpc/include/asm/smp.h +++ b/arch/powerpc/include/asm/smp.h @@ -56,7 +56,6 @@ struct smp_ops_t { int (*cpu_bootable)(unsigned int nr); }; -extern void smp_flush_nmi_ipi(u64 delay_us); extern int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us); extern int smp_send_safe_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us); extern void smp_send_debugger_break(void); |