[MIPS] Fix shadow register support.

Shadow register support would not possibly have worked on multicore
systems.  The support code for it was also depending not on MIPS R2 but
VSMP or SMTC kernels even though it makes perfect sense with UP kernels.

SR sets are a scarce resource and the expected usage pattern is that
users actually hardcode the register set numbers in their code.  So fix
the allocator by ditching it.  Move the remaining CPU probe bits into
the generic CPU probe.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index c8c47a2d1972..5c2794391bf5 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -943,6 +943,11 @@ __init void cpu_probe(void)
         }
 
         __cpu_name[cpu] = cpu_to_name(c);
+
+        if (cpu_has_mips_r2)
+                c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
+        else
+                c->srsets = 1;
 }
 
 __init void cpu_report(void)