clocksource: Replace vread with generic arch data

The vread field was bloating struct clocksource everywhere except
x86_64, and I want to change the way this works on x86_64, so let's
split it out into per-arch data.

Cc: x86@kernel.org
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: linux-ia64@vger.kernel.org
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: John Stultz <johnstul@us.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andy Lutomirski <luto@mit.edu>
Link: http://lkml.kernel.org/r/3ae5ec76a168eaaae63f08a2a1060b91aa0b7759.1310563276.git.luto@mit.edu
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

6 files changed, 31 insertions, 5 deletions

diff --git a/arch/x86/include/asm/clocksource.h b/arch/x86/include/asm/clocksource.h
new file mode 100644
index 000000000000..a5df33f614c9
--- /dev/null
+++ b/arch/x86/include/asm/clocksource.h
@@ -0,0 +1,16 @@
+/* x86-specific clocksource additions */
+
+#ifndef _ASM_X86_CLOCKSOURCE_H
+#define _ASM_X86_CLOCKSOURCE_H
+
+#ifdef CONFIG_X86_64
+
+#define __ARCH_HAS_CLOCKSOURCE_DATA
+
+struct arch_clocksource_data {
+        cycle_t (*vread)(void);
+};
+
+#endif /* CONFIG_X86_64 */
+
+#endif /* _ASM_X86_CLOCKSOURCE_H */
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index e9f5605e4748..0e07257bb389 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -753,7 +753,7 @@ static struct clocksource clocksource_hpet = {
         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
         .resume         = hpet_resume_counter,
 #ifdef CONFIG_X86_64
-        .vread          = vread_hpet,
+        .archdata       = { .vread = vread_hpet },
 #endif
 };
 
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 6cc6922262af..e7a74b889ab3 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -777,7 +777,7 @@ static struct clocksource clocksource_tsc = {
         .flags                  = CLOCK_SOURCE_IS_CONTINUOUS |
                                   CLOCK_SOURCE_MUST_VERIFY,
 #ifdef CONFIG_X86_64
-        .vread                  = vread_tsc,
+        .archdata               = { .vread = vread_tsc },
 #endif
 };
 
diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index a262400c3479..12d488fd95d9 100644
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -74,7 +74,7 @@ void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
         write_seqlock_irqsave(&vsyscall_gtod_data.lock, flags);
 
         /* copy vsyscall data */
-        vsyscall_gtod_data.clock.vread          = clock->vread;
+        vsyscall_gtod_data.clock.vread          = clock->archdata.vread;
         vsyscall_gtod_data.clock.cycle_last     = clock->cycle_last;
         vsyscall_gtod_data.clock.mask           = clock->mask;
         vsyscall_gtod_data.clock.mult           = mult;
diff --git a/include/asm-generic/clocksource.h b/include/asm-generic/clocksource.h
new file mode 100644
index 000000000000..0a462d3fb05e
--- /dev/null
+++ b/include/asm-generic/clocksource.h
@@ -0,0 +1,4 @@
+/*
+ * Architectures should override this file to add private userspace
+ * clock magic if needed.
+ */
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index d4646b48dc4a..0fb83c224471 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -22,6 +22,8 @@
 typedef u64 cycle_t;
 struct clocksource;
 
+#include <asm/clocksource.h>
+
 /**
  * struct cyclecounter - hardware abstraction for a free running counter
  *      Provides completely state-free accessors to the underlying hardware.
@@ -153,7 +155,7 @@ extern u64 timecounter_cyc2time(struct timecounter *tc,
  * @shift:              cycle to nanosecond divisor (power of two)
  * @max_idle_ns:        max idle time permitted by the clocksource (nsecs)
  * @flags:              flags describing special properties
- * @vread:              vsyscall based read
+ * @archdata:           arch-specific data
  * @suspend:            suspend function for the clocksource, if necessary
  * @resume:             resume function for the clocksource, if necessary
  */
@@ -175,10 +177,14 @@ struct clocksource {
 #else
 #define CLKSRC_FSYS_MMIO_SET(mmio, addr)      do { } while (0)
 #endif
+
+#ifdef __ARCH_HAS_CLOCKSOURCE_DATA
+        struct arch_clocksource_data archdata;
+#endif
+
         const char *name;
         struct list_head list;
         int rating;
-        cycle_t (*vread)(void);
         int (*enable)(struct clocksource *cs);
         void (*disable)(struct clocksource *cs);
         unsigned long flags;