powerpc/8xx: DataAccess exception not generated by MPC8xx

DataAccess exception is never generated by MPC8xx so do the job directly where
it is used to avoid an unnecessary branching.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>

diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index d30f703..464be24 100644 (file)
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -219,19 +219,10 @@ MachineCheck:
        EXC_XFER_STD(0x200, machine_check_exception)
 
 /* Data access exception.
- * This is "never generated" by the MPC8xx.  We jump to it for other
- * translation errors.
+ * This is "never generated" by the MPC8xx.
  */
        . = 0x300
 DataAccess:
-       EXCEPTION_PROLOG
-       mfspr   r10,SPRN_DSISR
-       stw     r10,_DSISR(r11)
-       mr      r5,r10
-       mfspr   r4,SPRN_DAR
-       li      r10,0x00f0
-       mtspr   SPRN_DAR,r10    /* Tag DAR, to be used in DTLB Error */
-       EXC_XFER_LITE(0x300, handle_page_fault)
 
 /* Instruction access exception.
  * This is "never generated" by the MPC8xx.
@@ -491,7 +482,15 @@ DataTLBError:
        beq-    FixupDAR        /* must be a buggy dcbX, icbi insn. */
 DARFixed:/* Return from dcbx instruction bug workaround */
        EXCEPTION_EPILOG_0
-       b       DataAccess
+       EXCEPTION_PROLOG
+       mfspr   r10,SPRN_DSISR
+       stw     r10,_DSISR(r11)
+       mr      r5,r10
+       mfspr   r4,SPRN_DAR
+       li      r10,0x00f0
+       mtspr   SPRN_DAR,r10    /* Tag DAR, to be used in DTLB Error */
+       /* 0x300 is DataAccess exception, needed by bad_page_fault() */
+       EXC_XFER_LITE(0x300, handle_page_fault)
 
        EXCEPTION(0x1500, Trap_15, unknown_exception, EXC_XFER_EE)
        EXCEPTION(0x1600, Trap_16, unknown_exception, EXC_XFER_EE)