lib/vdso: Mark do_hres_timens() and do_coarse_timens() __always_inline()

In the same spirit as commit c966533f8c6c ("lib/vdso: Mark do_hres()
and do_coarse() as __always_inline"), mark do_hres_timens() and
do_coarse_timens() __always_inline.

The measurement below in on a non timens process, ie on the fastest path.

On powerpc32, without the patch:

clock-gettime-monotonic-raw: vdso: 1155 nsec/call
clock-gettime-monotonic-coarse: vdso: 813 nsec/call
clock-gettime-monotonic: vdso: 1076 nsec/call

With the patch:

clock-gettime-monotonic-raw: vdso: 1100 nsec/call
clock-gettime-monotonic-coarse: vdso: 667 nsec/call
clock-gettime-monotonic: vdso: 1025 nsec/call

Signed-off-by: Christophe Leroy <[e-mail]>
Reviewed-by: Thomas Gleixner <[e-mail]>
Reviewed-by: Vincenzo Frascino <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://lore.kernel.org/r/90dcf45e[e-mail]

lib/vdso/gettimeofday.c

···
 #endif
 
 #ifdef CONFIG_TIME_NS
-static int do_hres_timens(const struct vdso_data *vdns, clockid_t clk,
-			  struct __kernel_timespec *ts)
+static __always_inline int do_hres_timens(const struct vdso_data *vdns, clockid_t clk,
+					  struct __kernel_timespec *ts)
 {
 	const struct vdso_data *vd = __arch_get_timens_vdso_data();
 	const struct timens_offset *offs = &vdns->offset[clk];
···
 	return NULL;
 }
 
-static int do_hres_timens(const struct vdso_data *vdns, clockid_t clk,
-			  struct __kernel_timespec *ts)
+static __always_inline int do_hres_timens(const struct vdso_data *vdns, clockid_t clk,
+					  struct __kernel_timespec *ts)
 {
 	return -EINVAL;
 }
···
 }
 
 #ifdef CONFIG_TIME_NS
-static int do_coarse_timens(const struct vdso_data *vdns, clockid_t clk,
-			    struct __kernel_timespec *ts)
+static __always_inline int do_coarse_timens(const struct vdso_data *vdns, clockid_t clk,
+					    struct __kernel_timespec *ts)
 {
 	const struct vdso_data *vd = __arch_get_timens_vdso_data();
 	const struct vdso_timestamp *vdso_ts = &vd->basetime[clk];
···
 	return 0;
 }
 #else
-static int do_coarse_timens(const struct vdso_data *vdns, clockid_t clk,
-			    struct __kernel_timespec *ts)
+static __always_inline int do_coarse_timens(const struct vdso_data *vdns, clockid_t clk,
+					    struct __kernel_timespec *ts)
 {
 	return -1;
 }