parisc: Flush ITLB in flush_tlb_all_local() only on split TLB machines

flush_tlb_all_local() flushes the ITLB and DTLB of the CPU.
In case the machine does not have separate ITLBs and DTLBs, use the
alternative functionality to replace the code which flushes the ITLB
with nops while keeping the code which flushes the DTLB.

Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/arch/parisc/kernel/pacache.S b/arch/parisc/kernel/pacache.S
index ba67893..df46b0e 100644 (file)
--- a/arch/parisc/kernel/pacache.S
+++ b/arch/parisc/kernel/pacache.S
@@ -63,7 +63,7 @@ ENTRY_CFI(flush_tlb_all_local)
 
        /* Flush Instruction Tlb */
 
-       LDREG           ITLB_SID_BASE(%r1), %r20
+88:    LDREG           ITLB_SID_BASE(%r1), %r20
        LDREG           ITLB_SID_STRIDE(%r1), %r21
        LDREG           ITLB_SID_COUNT(%r1), %r22
        LDREG           ITLB_OFF_BASE(%r1), %arg0
@@ -103,6 +103,7 @@ fitonemiddle:                                       /* Loop if LOOP = 1 */
        add             %r21, %r20, %r20                /* increment space */
 
 fitdone:
+       ALTERNATIVE(88b, fitdone, ALT_COND_NO_SPLIT_TLB, INSN_NOP)
 
        /* Flush Data Tlb */