powerpc/bpf: Rename PPC_BL_ABS() to PPC_BL()

PPC_BL_ABS() is just doing a relative branch with link. The name
suggests that it is for branching to an absolute address, which is
incorrect. Rename the macro to a more appropriate PPC_BL().
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f0e57b6c7a6ee40dba645535b70da46f46e8af5e.1644834730.git.naveen.n.rao@linux.vnet.ibm.com

arch/powerpc/net/bpf_jit.h

@@ -34,9 +34,9 @@
 		EMIT(PPC_RAW_BRANCH(offset));				      \
 	} while (0)
 
-/* blr; (unconditional 'branch' with link) to absolute address */
-#define PPC_BL_ABS(dest)	EMIT(PPC_INST_BL |			      \
-				     (((dest) - (unsigned long)(image + ctx->idx)) & 0x03fffffc))
+/* bl (unconditional 'branch' with link) */
+#define PPC_BL(dest)	EMIT(PPC_INST_BL | (((dest) - (unsigned long)(image + ctx->idx)) & 0x03fffffc))
+
 /* "cond" here covers BO:BI fields. */
 #define PPC_BCC_SHORT(cond, dest)					      \
 	do {								      \

arch/powerpc/net/bpf_jit_comp32.c

@@ -198,7 +198,7 @@ int bpf_jit_emit_func_call_rel(u32 *image, struct codegen_context *ctx, u64 func
 	s32 rel = (s32)func - (s32)(image + ctx->idx);
 
 	if (image && rel < 0x2000000 && rel >= -0x2000000) {
-		PPC_BL_ABS(func);
+		PPC_BL(func);
 		EMIT(PPC_RAW_NOP());
 		EMIT(PPC_RAW_NOP());
 		EMIT(PPC_RAW_NOP());