powerpc: Use lwarx/ldarx hint in bit locks

This patch implements the lwarx/ldarx hint bit for bit locks.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index ecec76051184..aea714797590 100644
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -22,6 +22,7 @@
 #define PPC_INST_DCBZL                  0x7c2007ec
 #define PPC_INST_ISEL                   0x7c00001e
 #define PPC_INST_ISEL_MASK              0xfc00003e
+#define PPC_INST_LDARX                  0x7c0000a8
 #define PPC_INST_LSWI                   0x7c0004aa
 #define PPC_INST_LSWX                   0x7c00042a
 #define PPC_INST_LWARX                  0x7c000029
@@ -75,6 +76,9 @@
                                         __PPC_RA(a) | __PPC_RB(b))
 #define PPC_DCBZL(a, b)         stringify_in_c(.long PPC_INST_DCBZL | \
                                         __PPC_RA(a) | __PPC_RB(b))
+#define PPC_LDARX(t, a, b, eh)  stringify_in_c(.long PPC_INST_LDARX | \
+                                        __PPC_RT(t) | __PPC_RA(a) | \
+                                        __PPC_RB(b) | __PPC_EH(eh))
 #define PPC_LWARX(t, a, b, eh)  stringify_in_c(.long PPC_INST_LWARX | \
                                         __PPC_RT(t) | __PPC_RA(a) | \
                                         __PPC_RB(b) | __PPC_EH(eh))