lib/vdso: Cleanup clock mode storage leftovers

Now that all architectures are converted to use the generic storage the
helpers and conditionals can be removed.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Link: https://lkml.kernel.org/r/20200207124403.470699892@linutronix.de

arch/arm/mm/Kconfig

@@ -900,7 +900,6 @@ config VDSO
 	select GENERIC_TIME_VSYSCALL
 	select GENERIC_VDSO_32
 	select GENERIC_GETTIMEOFDAY
-	select GENERIC_VDSO_CLOCK_MODE
 	help
 	  Place in the process address space an ELF shared object
 	  providing fast implementations of gettimeofday and

arch/arm64/Kconfig

@@ -110,7 +110,6 @@ config ARM64
 	select GENERIC_STRNLEN_USER
 	select GENERIC_TIME_VSYSCALL
 	select GENERIC_GETTIMEOFDAY
-	select GENERIC_VDSO_CLOCK_MODE
 	select HANDLE_DOMAIN_IRQ
 	select HARDIRQS_SW_RESEND
 	select HAVE_PCI

arch/mips/Kconfig

@@ -37,7 +37,6 @@ config MIPS
 	select GENERIC_SCHED_CLOCK if !CAVIUM_OCTEON_SOC
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_TIME_VSYSCALL
-	select GENERIC_VDSO_CLOCK_MODE
 	select GUP_GET_PTE_LOW_HIGH if CPU_MIPS32 && PHYS_ADDR_T_64BIT
 	select HANDLE_DOMAIN_IRQ
 	select HAVE_ARCH_COMPILER_H

arch/x86/Kconfig

@@ -125,7 +125,6 @@ config X86
 	select GENERIC_STRNLEN_USER
 	select GENERIC_TIME_VSYSCALL
 	select GENERIC_GETTIMEOFDAY
-	select GENERIC_VDSO_CLOCK_MODE
 	select GENERIC_VDSO_TIME_NS
 	select GUP_GET_PTE_LOW_HIGH		if X86_PAE
 	select HARDLOCKUP_CHECK_TIMESTAMP	if X86_64

include/asm-generic/vdso/vsyscall.h

@@ -18,13 +18,6 @@ static __always_inline bool __arch_update_vdso_data(void)
 }
 #endif /* __arch_update_vdso_data */
 
-#ifndef __arch_get_clock_mode
-static __always_inline int __arch_get_clock_mode(struct timekeeper *tk)
-{
-	return 0;
-}
-#endif /* __arch_get_clock_mode */
-
 #ifndef __arch_update_vsyscall
 static __always_inline void __arch_update_vsyscall(struct vdso_data *vdata,
 						   struct timekeeper *tk)

include/linux/clocksource.h

@@ -24,13 +24,13 @@ struct clocksource;
 struct module;
 
 #if defined(CONFIG_ARCH_CLOCKSOURCE_DATA) || \
-    defined(CONFIG_GENERIC_VDSO_CLOCK_MODE)
+    defined(CONFIG_GENERIC_GETTIMEOFDAY)
 #include <asm/clocksource.h>
 #endif
 
 enum vdso_clock_mode {
 	VDSO_CLOCKMODE_NONE,
-#ifdef CONFIG_GENERIC_VDSO_CLOCK_MODE
+#ifdef CONFIG_GENERIC_GETTIMEOFDAY
 	VDSO_ARCH_CLOCKMODES,
 #endif
 	VDSO_CLOCKMODE_MAX,

kernel/time/vsyscall.c

@@ -77,11 +77,7 @@ void update_vsyscall(struct timekeeper *tk)
 	/* copy vsyscall data */
 	vdso_write_begin(vdata);
 
-#ifdef CONFIG_GENERIC_VDSO_CLOCK_MODE
 	clock_mode = tk->tkr_mono.clock->vdso_clock_mode;
-#else
-	clock_mode = __arch_get_clock_mode(tk);
-#endif
 	vdata[CS_HRES_COARSE].clock_mode	= clock_mode;
 	vdata[CS_RAW].clock_mode		= clock_mode;
 

lib/vdso/Kconfig

@@ -30,7 +30,4 @@ config GENERIC_VDSO_TIME_NS
 	  Selected by architectures which support time namespaces in the
 	  VDSO
 
-config GENERIC_VDSO_CLOCK_MODE
-	bool
-
 endif

lib/vdso/gettimeofday.c

@@ -65,16 +65,13 @@ static int do_hres_timens(const struct vdso_data *vdns, clockid_t clk,
 
 	do {
 		seq = vdso_read_begin(vd);
-		if (IS_ENABLED(CONFIG_GENERIC_VDSO_CLOCK_MODE) &&
+
-		    vd->clock_mode == VDSO_CLOCKMODE_NONE)
+		if (unlikely(vd->clock_mode == VDSO_CLOCKMODE_NONE))
 			return -1;
+
 		cycles = __arch_get_hw_counter(vd->clock_mode);
 		ns = vdso_ts->nsec;
 		last = vd->cycle_last;
-		if (!IS_ENABLED(CONFIG_GENERIC_VDSO_CLOCK_MODE) &&
-		    unlikely((s64)cycles < 0))
-			return -1;
-
 		ns += vdso_calc_delta(cycles, last, vd->mask, vd->mult);
 		ns >>= vd->shift;
 		sec = vdso_ts->sec;
@@ -137,16 +134,12 @@ static __always_inline int do_hres(const struct vdso_data *vd, clockid_t clk,
 		}
 		smp_rmb();
 
-		if (IS_ENABLED(CONFIG_GENERIC_VDSO_CLOCK_MODE) &&
+		if (unlikely(vd->clock_mode == VDSO_CLOCKMODE_NONE))
-		    vd->clock_mode == VDSO_CLOCKMODE_NONE)
 			return -1;
+
 		cycles = __arch_get_hw_counter(vd->clock_mode);
 		ns = vdso_ts->nsec;
 		last = vd->cycle_last;
-		if (!IS_ENABLED(CONFIG_GENERIC_VDSO_CLOCK_MODE) &&
-		    unlikely((s64)cycles < 0))
-			return -1;
-
 		ns += vdso_calc_delta(cycles, last, vd->mask, vd->mult);
 		ns >>= vd->shift;
 		sec = vdso_ts->sec;