s390/vx: Convert cpu_has_vx() to cpu feature function

Instead of having a private cpu_has_vx() implementation use the new common
cpu feature method. Move the facility detection to the decompressor so it
matches all other cpu features.

Reviewed-by: Vasily Gorbik <[e-mail]>
Signed-off-by: Heiko Carstens <[e-mail]>
Signed-off-by: Vasily Gorbik <[e-mail]>

arch/s390/boot/startup.c

···
 		set_machine_feature(MFEATURE_TX);
 		local_ctl_set_bit(0, CR0_TRANSACTIONAL_EXECUTION_BIT);
 	}
+	if (cpu_has_vx())
+		local_ctl_set_bit(0, CR0_VECTOR_BIT);
 }
 
 static int cmma_test_essa(void)

arch/s390/include/asm/cpufeature.h

···
 #define cpu_has_seq_insn()	test_facility(85)
 #define cpu_has_tlb_lc()	test_facility(51)
 #define cpu_has_topology()	test_facility(11)
+#define cpu_has_vx()		test_facility(129)
 
 #endif /* __ASM_S390_CPUFEATURE_H */

arch/s390/include/asm/fpu.h

···
 #ifndef _ASM_S390_FPU_H
 #define _ASM_S390_FPU_H
 
+#include <linux/cpufeature.h>
 #include <linux/processor.h>
 #include <linux/preempt.h>
 #include <linux/string.h>
···
 #include <asm/sigcontext.h>
 #include <asm/fpu-types.h>
 #include <asm/fpu-insn.h>
-#include <asm/facility.h>
-
-static inline bool cpu_has_vx(void)
-{
-	return likely(test_facility(129));
-}
 
 enum {
 	KERNEL_FPC_BIT = 0,

arch/s390/kernel/early.c

···
 	lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
 }
 
-static __init void detect_machine_facilities(void)
-{
-	if (test_facility(129))
-		system_ctl_set_bit(0, CR0_VECTOR_BIT);
-}
-
 static inline void save_vector_registers(void)
 {
 #ifdef CONFIG_CRASH_DUMP
-	if (test_facility(129))
+	if (cpu_has_vx())
 		save_vx_regs(boot_cpu_vector_save_area);
 #endif
 }
···
 	setup_lowcore_early();
 	setup_arch_string();
 	setup_boot_command_line();
-	detect_machine_facilities();
 	save_vector_registers();
 	setup_topology();
 	sclp_early_detect();

lib/raid6/s390vx.uc

···
  * This file is postprocessed using unroll.awk.
  */
 
+#include <linux/cpufeature.h>
 #include <linux/raid/pq.h>
 #include <asm/fpu.h>