powerpc/32: Use r2 in wrtspr() instead of r0

wrtspr() is a function to write an arbitrary value in a special
register. It is used on 8xx to write to SPRN_NRI, SPRN_EID and
SPRN_EIE. Writing any value to one of those will play with MSR EE
and MSR RI regardless of that value.

r0 is used many places in the generated code and using r0 for
that creates an unnecessary dependency of this instruction with
preceding ones using r0 in a few places in vmlinux.

r2 is most likely the most stable register as it contains the
pointer to 'current'.

Using r2 instead of r0 avoids that unnecessary dependency.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/69f9968f4b592fefda55227f0f7430ea612cc950.1611299687.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 9086a2644c89b948a023838e046efe92dc6d773f..7c81d3e563b28e94b8d5e1e4e56fdef0f063b302 100644 (file)
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -1394,8 +1394,7 @@ static inline void mtmsr_isync(unsigned long val)
                                     : "r" ((unsigned long)(v)) \
                                     : "memory")
 #endif
-#define wrtspr(rn)     asm volatile("mtspr " __stringify(rn) ",0" : \
-                                    : : "memory")
+#define wrtspr(rn)     asm volatile("mtspr " __stringify(rn) ",2" : : : "memory")
 
 static inline void wrtee(unsigned long val)
 {