sparc32: implement SMP IPIs using the generic functions

The current sparc32 SMP IPI generation is implemented the
cross call function. The cross call function uses IRQ15 the
NMI, this is has the effect that IPIs will interrupt IRQ
critical areas and hang the system. Typically on/after
spin_lock_irqsave calls can be aborted.

The cross call functionality must still exist to flush
cache/TLBS.

This patch provides CPU models a custom way to implement
generation of IPIs on the generic code's request. The
typical approach is to generate an IRQ for each IPI case.

After this patch each sparc32 SMP CPU model needs to
implement IPIs in order to function properly.

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 2 deletions

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index a56630d4f14b..63a027c9ada5 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -28,7 +28,7 @@ config SPARC
         select HAVE_GENERIC_HARDIRQS
         select GENERIC_HARDIRQS_NO_DEPRECATED
         select GENERIC_IRQ_SHOW
-
+        select USE_GENERIC_SMP_HELPERS if SMP
 
 config SPARC32
         def_bool !64BIT
@@ -47,7 +47,6 @@ config SPARC64
         select HAVE_DYNAMIC_FTRACE
         select HAVE_FTRACE_MCOUNT_RECORD
         select HAVE_SYSCALL_TRACEPOINTS
-        select USE_GENERIC_SMP_HELPERS if SMP
         select RTC_DRV_CMOS
         select RTC_DRV_BQ4802
         select RTC_DRV_SUN4V