MIPS: MT: Remove SMTC support

Nobody is maintaining SMTC anymore and there also seems to be no userbase.
Which is a pity - the SMTC technology primarily developed by Kevin D.
Kissell <kevink@paralogos.com> is an ingenious demonstration for the MT
ASE's power and elegance.

Based on Markos Chandras <Markos.Chandras@imgtec.com> patch
https://patchwork.linux-mips.org/patch/6719/ which while very similar did
no longer apply cleanly when I tried to merge it plus some additional
post-SMTC cleanup - SMTC was a feature as tricky to remove as it was to
merge once upon a time.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 0 insertions, 13 deletions

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 0a022ee33b2a..35bb05a13f05 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -43,10 +43,6 @@
 #include <asm/time.h>
 #include <asm/setup.h>
 
-#ifdef CONFIG_MIPS_MT_SMTC
-#include <asm/mipsmtregs.h>
-#endif /* CONFIG_MIPS_MT_SMTC */
-
 volatile cpumask_t cpu_callin_map;      /* Bitmask of started secondaries */
 
 int __cpu_number_map[NR_CPUS];          /* Map physical to logical */
@@ -102,12 +98,6 @@ asmlinkage void start_secondary(void)
 {
         unsigned int cpu;
 
-#ifdef CONFIG_MIPS_MT_SMTC
-        /* Only do cpu_probe for first TC of CPU */
-        if ((read_c0_tcbind() & TCBIND_CURTC) != 0)
-                __cpu_name[smp_processor_id()] = __cpu_name[0];
-        else
-#endif /* CONFIG_MIPS_MT_SMTC */
         cpu_probe();
         cpu_report();
         per_cpu_trap_init(false);
@@ -238,13 +228,10 @@ static void flush_tlb_mm_ipi(void *mm)
  *  o collapses to normal function call on UP kernels
  *  o collapses to normal function call on systems with a single shared
  *    primary cache.
- *  o CONFIG_MIPS_MT_SMTC currently implies there is only one physical core.
  */
 static inline void smp_on_other_tlbs(void (*func) (void *info), void *info)
 {
-#ifndef CONFIG_MIPS_MT_SMTC
         smp_call_function(func, info, 1);
-#endif
 }
 
 static inline void smp_on_each_tlb(void (*func) (void *info), void *info)