MIPS: kexec: remove SMP_DUMP

SMP_DUMP has been added as a new IPI signal when kexec support was added
for Cavium Octeon CPUs ('commit 7aa1c8f47e7e ("MIPS: kdump: Add support")'.
However, the new signal doesn't appear to ever have a proper handler
added (octeon_message_functions[] array has an empty handler for it),
and generic IPI handlers now trigger a BUG() on unhandled signal.

As the method is unused remove it completely and replace its only
invocation with a smp_call_function().

[[e-mail]: Renumber SMP_ASK_C0COUNT to avoid numbering gaps.]

Signed-off-by: Marcin Nowakowski <[e-mail]>
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/14630/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/include/asm/smp.h

···
 #define SMP_CALL_FUNCTION	0x2
 /* Octeon - Tell another core to flush its icache */
 #define SMP_ICACHE_FLUSH	0x4
-/* Used by kexec crashdump to save all cpu's state */
-#define SMP_DUMP		0x8
-#define SMP_ASK_C0COUNT		0x10
+#define SMP_ASK_C0COUNT		0x8
 
 /* Mask of CPUs which are currently definitely operating coherently */
 extern cpumask_t cpu_coherent_mask;
···
 	mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
 }
 
-#if defined(CONFIG_KEXEC)
-extern void (*dump_ipi_function_ptr)(void *);
-void dump_send_ipi(void (*dump_ipi_callback)(void *));
-#endif
 #endif /* __ASM_SMP_H */

arch/mips/kernel/crash.c

···
 
 	ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
 
-	dump_send_ipi(crash_shutdown_secondary);
+	smp_call_function(crash_shutdown_secondary, NULL, 0);
 	smp_wmb();
 
 	/*

arch/mips/kernel/smp.c

···
 EXPORT_SYMBOL(flush_tlb_page);
 EXPORT_SYMBOL(flush_tlb_one);
 
-#if defined(CONFIG_KEXEC)
-void (*dump_ipi_function_ptr)(void *) = NULL;
-void dump_send_ipi(void (*dump_ipi_callback)(void *))
-{
-	int i;
-	int cpu = smp_processor_id();
-
-	dump_ipi_function_ptr = dump_ipi_callback;
-	smp_mb();
-	for_each_online_cpu(i)
-		if (i != cpu)
-			mp_ops->send_ipi_single(i, SMP_DUMP);
-
-}
-EXPORT_SYMBOL(dump_send_ipi);
-#endif
-
 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 
 static DEFINE_PER_CPU(atomic_t, tick_broadcast_count);