x86/asm/tsc: Replace rdtscll() with native_read_tsc()

Now that the ->read_tsc() paravirt hook is gone, rdtscll() is
just a wrapper around native_read_tsc(). Unwrap it.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Huang Rui <ray.huang@amd.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Len Brown <lenb@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kvm ML <kvm@vger.kernel.org>
Link: http://lkml.kernel.org/r/d2449ae62c1b1fb90195bcfb19ef4a35883a04dc.1434501121.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

12 files changed, 18 insertions, 24 deletions

diff --git a/arch/x86/boot/compressed/aslr.c b/arch/x86/boot/compressed/aslr.c
index d7b1f655b3ef..ea33236190b1 100644
--- a/arch/x86/boot/compressed/aslr.c
+++ b/arch/x86/boot/compressed/aslr.c
@@ -82,7 +82,7 @@ static unsigned long get_random_long(void)
 
 	if (has_cpuflag(X86_FEATURE_TSC)) {
 		debug_putstr(" RDTSC");
-		rdtscll(raw);
+		raw = native_read_tsc();
 
 		random ^= raw;
 		use_i8254 = false;
diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index d1afac7df484..7273b74e0f99 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -192,9 +192,6 @@ do {							\
 #define rdtscl(low)						\
 	((low) = (u32)native_read_tsc())
 
-#define rdtscll(val)						\
-	((val) = native_read_tsc())
-
 #define rdtscp(low, high, aux)					\
 do {                                                            \
 	unsigned long long _val = native_read_tscp(&(aux));     \
diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h
index 3da1cc1218ac..b4883902948b 100644
--- a/arch/x86/include/asm/tsc.h
+++ b/arch/x86/include/asm/tsc.h
@@ -21,15 +21,12 @@ extern void disable_TSC(void);
 
 static inline cycles_t get_cycles(void)
 {
-	unsigned long long ret = 0;
-
 #ifndef CONFIG_X86_TSC
 	if (!cpu_has_tsc)
 		return 0;
 #endif
-	rdtscll(ret);
 
-	return ret;
+	return native_read_tsc();
 }
 
 extern void tsc_init(void);
diff --git a/arch/x86/kernel/apb_timer.c b/arch/x86/kernel/apb_timer.c
index 9fe111cc50f8..25efa534c4e4 100644
--- a/arch/x86/kernel/apb_timer.c
+++ b/arch/x86/kernel/apb_timer.c
@@ -263,7 +263,7 @@ static int apbt_clocksource_register(void)
 
 	/* Verify whether apbt counter works */
 	t1 = dw_apb_clocksource_read(clocksource_apbt);
-	rdtscll(start);
+	start = native_read_tsc();
 
 	/*
 	 * We don't know the TSC frequency yet, but waiting for
@@ -273,7 +273,7 @@ static int apbt_clocksource_register(void)
 	 */
 	do {
 		rep_nop();
-		rdtscll(now);
+		now = native_read_tsc();
 	} while ((now - start) < 200000UL);
 
 	/* APBT is the only always on clocksource, it has to work! */
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index dcb52850a28f..51af1ed1ae2e 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -457,7 +457,7 @@ static int lapic_next_deadline(unsigned long delta,
 {
 	u64 tsc;
 
-	rdtscll(tsc);
+	tsc = native_read_tsc();
 	wrmsrl(MSR_IA32_TSC_DEADLINE, tsc + (((u64) delta) * TSC_DIVISOR));
 	return 0;
 }
@@ -592,7 +592,7 @@ static void __init lapic_cal_handler(struct clock_event_device *dev)
 	unsigned long pm = acpi_pm_read_early();
 
 	if (cpu_has_tsc)
-		rdtscll(tsc);
+		tsc = native_read_tsc();
 
 	switch (lapic_cal_loops++) {
 	case 0:
@@ -1209,7 +1209,7 @@ void setup_local_APIC(void)
 	long long max_loops = cpu_khz ? cpu_khz : 1000000;
 
 	if (cpu_has_tsc)
-		rdtscll(tsc);
+		tsc = native_read_tsc();
 
 	if (disable_apic) {
 		disable_ioapic_support();
@@ -1293,7 +1293,7 @@ void setup_local_APIC(void)
 		}
 		if (queued) {
 			if (cpu_has_tsc && cpu_khz) {
-				rdtscll(ntsc);
+				ntsc = native_read_tsc();
 				max_loops = (cpu_khz << 10) - (ntsc - tsc);
 			} else
 				max_loops--;
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index df919ff103c3..a5283d2d0094 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -125,7 +125,7 @@ void mce_setup(struct mce *m)
 {
 	memset(m, 0, sizeof(struct mce));
 	m->cpu = m->extcpu = smp_processor_id();
-	rdtscll(m->tsc);
+	m->tsc = native_read_tsc();
 	/* We hope get_seconds stays lockless */
 	m->time = get_seconds();
 	m->cpuvendor = boot_cpu_data.x86_vendor;
@@ -1784,7 +1784,7 @@ static void collect_tscs(void *data)
 {
 	unsigned long *cpu_tsc = (unsigned long *)data;
 
-	rdtscll(cpu_tsc[smp_processor_id()]);
+	cpu_tsc[smp_processor_id()] = native_read_tsc();
 }
 
 static int mce_apei_read_done;
diff --git a/arch/x86/kernel/espfix_64.c b/arch/x86/kernel/espfix_64.c
index f5d0730e7b08..334a2a9c034d 100644
--- a/arch/x86/kernel/espfix_64.c
+++ b/arch/x86/kernel/espfix_64.c
@@ -110,7 +110,7 @@ static void init_espfix_random(void)
 	 */
 	if (!arch_get_random_long(&rand)) {
 		/* The constant is an arbitrary large prime */
-		rdtscll(rand);
+		rand = native_read_tsc();
 		rand *= 0xc345c6b72fd16123UL;
 	}
 
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 10757d0a3fcf..cc390fe69b71 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -735,7 +735,7 @@ static int hpet_clocksource_register(void)
 
 	/* Verify whether hpet counter works */
 	t1 = hpet_readl(HPET_COUNTER);
-	rdtscll(start);
+	start = native_read_tsc();
 
 	/*
 	 * We don't know the TSC frequency yet, but waiting for
@@ -745,7 +745,7 @@ static int hpet_clocksource_register(void)
 	 */
 	do {
 		rep_nop();
-		rdtscll(now);
+		now = native_read_tsc();
 	} while ((now - start) < 200000UL);
 
 	if (t1 == hpet_readl(HPET_COUNTER)) {
diff --git a/arch/x86/kernel/trace_clock.c b/arch/x86/kernel/trace_clock.c
index 25b993729f9b..bd8f4d41bd56 100644
--- a/arch/x86/kernel/trace_clock.c
+++ b/arch/x86/kernel/trace_clock.c
@@ -15,7 +15,7 @@ u64 notrace trace_clock_x86_tsc(void)
 	u64 ret;
 
 	rdtsc_barrier();
-	rdtscll(ret);
+	ret = native_read_tsc();
 
 	return ret;
 }
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index e7710cd7ba00..e66f5dcaeb63 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -248,7 +248,7 @@ static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
 
 	data = cyc2ns_write_begin(cpu);
 
-	rdtscll(tsc_now);
+	tsc_now = native_read_tsc();
 	ns_now = cycles_2_ns(tsc_now);
 
 	/*
@@ -290,7 +290,7 @@ u64 native_sched_clock(void)
 	}
 
 	/* read the Time Stamp Counter: */
-	rdtscll(tsc_now);
+	tsc_now = native_read_tsc();
 
 	/* return the value in ns */
 	return cycles_2_ns(tsc_now);
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e856dd566f4c..4fa1ccad7beb 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2236,7 +2236,7 @@ static u64 guest_read_tsc(void)
 {
 	u64 host_tsc, tsc_offset;
 
-	rdtscll(host_tsc);
+	host_tsc = native_read_tsc();
 	tsc_offset = vmcs_read64(TSC_OFFSET);
 	return host_tsc + tsc_offset;
 }
diff --git a/arch/x86/lib/delay.c b/arch/x86/lib/delay.c
index 39d6a3db0b96..9a52ad0c0758 100644
--- a/arch/x86/lib/delay.c
+++ b/arch/x86/lib/delay.c
@@ -100,7 +100,7 @@ void use_tsc_delay(void)
 int read_current_timer(unsigned long *timer_val)
 {
 	if (delay_fn == delay_tsc) {
-		rdtscll(*timer_val);
+		*timer_val = native_read_tsc();
 		return 0;
 	}
 	return -1;