MIPS: XPA: Allow use of $0 (zero) to MTHC0

Tweak __writex_32bit_c0_register() to allow the compiler to use $0 (the
zero register) as an input to the mthc0 instruction.

Signed-off-by: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17774/

diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h
index f336846fb4158943f6370ad212e2ee06c15fa098..b1dedd5935a1c128166166fd31446aa2e551ebf7 100644 (file)
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -1537,10 +1537,10 @@ do {                                                                    \
        "       .set    push                                    \n"     \
        "       .set    mips32r2                                \n"     \
        _ASM_SET_XPA                                                    \
-       "       mthc0   %0, $%1                                 \n"     \
+       "       mthc0   %z0, $%1                                \n"     \
        "       .set    pop                                     \n"     \
        :                                                               \
-       : "r" (value), "i" (register));                                 \
+       : "Jr" (value), "i" (register));                                \
 } while (0)
 
 #define read_c0_index()                __read_32bit_c0_register($0, 0)