diff options
| author | Andy Lutomirski <luto@mit.edu> | 2011-07-14 06:47:22 -0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2011-07-14 17:57:05 -0700 |
| commit | 98d0ac38ca7b1b7a552c9a2359174ff84decb600 (patch) | |
| tree | 0c244e828f86c779c348a4888ed9e303c3e59811 /arch/x86/include | |
| parent | 433bd805e5fd2c731b3a9025b034f066272d336e (diff) | |
| download | linux-next-98d0ac38ca7b1b7a552c9a2359174ff84decb600.tar.gz | |
x86-64: Move vread_tsc and vread_hpet into the vDSO
The vsyscall page now consists entirely of trap instructions.
Cc: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andy Lutomirski <luto@mit.edu>
Link: http://lkml.kernel.org/r/637648f303f2ef93af93bae25186e9a1bea093f5.1310639973.git.luto@mit.edu
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/clocksource.h | 6 | ||||
| -rw-r--r-- | arch/x86/include/asm/tsc.h | 4 | ||||
| -rw-r--r-- | arch/x86/include/asm/vgtod.h | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/vsyscall.h | 4 |
4 files changed, 6 insertions, 10 deletions
diff --git a/arch/x86/include/asm/clocksource.h b/arch/x86/include/asm/clocksource.h index a5df33f614c9..3882c65dc19b 100644 --- a/arch/x86/include/asm/clocksource.h +++ b/arch/x86/include/asm/clocksource.h @@ -7,8 +7,12 @@ #define __ARCH_HAS_CLOCKSOURCE_DATA +#define VCLOCK_NONE 0 /* No vDSO clock available. */ +#define VCLOCK_TSC 1 /* vDSO should use vread_tsc. */ +#define VCLOCK_HPET 2 /* vDSO should use vread_hpet. */ + struct arch_clocksource_data { - cycle_t (*vread)(void); + int vclock_mode; }; #endif /* CONFIG_X86_64 */ diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h index 9db5583b6d38..83e2efd181e2 100644 --- a/arch/x86/include/asm/tsc.h +++ b/arch/x86/include/asm/tsc.h @@ -51,10 +51,6 @@ extern int unsynchronized_tsc(void); extern int check_tsc_unstable(void); extern unsigned long native_calibrate_tsc(void); -#ifdef CONFIG_X86_64 -extern cycles_t vread_tsc(void); -#endif - /* * Boot-time check whether the TSCs are synchronized across * all CPUs/cores: diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h index aa5add855a91..815285bcaceb 100644 --- a/arch/x86/include/asm/vgtod.h +++ b/arch/x86/include/asm/vgtod.h @@ -13,7 +13,7 @@ struct vsyscall_gtod_data { struct timezone sys_tz; struct { /* extract of a clocksource struct */ - cycle_t (*vread)(void); + int vclock_mode; cycle_t cycle_last; cycle_t mask; u32 mult; diff --git a/arch/x86/include/asm/vsyscall.h b/arch/x86/include/asm/vsyscall.h index d55597351f6a..60107072c28b 100644 --- a/arch/x86/include/asm/vsyscall.h +++ b/arch/x86/include/asm/vsyscall.h @@ -16,10 +16,6 @@ enum vsyscall_num { #ifdef __KERNEL__ #include <linux/seqlock.h> -/* Definitions for CONFIG_GENERIC_TIME definitions */ -#define __vsyscall_fn \ - __attribute__ ((unused, __section__(".vsyscall_fn"))) notrace - #define VGETCPU_RDTSCP 1 #define VGETCPU_LSL 2 |