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| author | Andrea Arcangeli <andrea@cpushare.com> | 2007-07-15 23:41:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-16 09:05:50 -0700 |
| commit | cf99abace7e07dd8491e7093a9a9ef11d48838ed (patch) | |
| tree | 3b7cfd7c76c2c43e6ae3fdaaff3a50a752072424 /include | |
| parent | 1d9d02feeee89e9132034d504c9a45eeaf618a3d (diff) | |
| download | kernel_samsung_tuna-cf99abace7e07dd8491e7093a9a9ef11d48838ed.zip kernel_samsung_tuna-cf99abace7e07dd8491e7093a9a9ef11d48838ed.tar.gz kernel_samsung_tuna-cf99abace7e07dd8491e7093a9a9ef11d48838ed.tar.bz2 | |
make seccomp zerocost in schedule
This follows a suggestion from Chuck Ebbert on how to make seccomp
absolutely zerocost in schedule too. The only remaining footprint of
seccomp is in terms of the bzImage size that becomes a few bytes (perhaps
even a few kbytes) larger, measure it if you care in the embedded.
Signed-off-by: Andrea Arcangeli <andrea@cpushare.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-i386/processor.h | 4 | ||||
| -rw-r--r-- | include/asm-i386/thread_info.h | 5 | ||||
| -rw-r--r-- | include/linux/seccomp.h | 10 |
3 files changed, 8 insertions, 11 deletions
diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h index 94e0c14..422cffe 100644 --- a/include/asm-i386/processor.h +++ b/include/asm-i386/processor.h @@ -228,6 +228,10 @@ extern int bootloader_type; #define HAVE_ARCH_PICK_MMAP_LAYOUT +extern void hard_disable_TSC(void); +extern void disable_TSC(void); +extern void hard_enable_TSC(void); + /* * Size of io_bitmap. */ diff --git a/include/asm-i386/thread_info.h b/include/asm-i386/thread_info.h index 4cb0f91..54424e0 100644 --- a/include/asm-i386/thread_info.h +++ b/include/asm-i386/thread_info.h @@ -137,6 +137,7 @@ static inline struct thread_info *current_thread_info(void) #define TIF_DEBUG 17 /* uses debug registers */ #define TIF_IO_BITMAP 18 /* uses I/O bitmap */ #define TIF_FREEZE 19 /* is freezing for suspend */ +#define TIF_NOTSC 20 /* TSC is not accessible in userland */ #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) @@ -151,6 +152,7 @@ static inline struct thread_info *current_thread_info(void) #define _TIF_DEBUG (1<<TIF_DEBUG) #define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP) #define _TIF_FREEZE (1<<TIF_FREEZE) +#define _TIF_NOTSC (1<<TIF_NOTSC) /* work to do on interrupt/exception return */ #define _TIF_WORK_MASK \ @@ -160,7 +162,8 @@ static inline struct thread_info *current_thread_info(void) #define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP) /* flags to check in __switch_to() */ -#define _TIF_WORK_CTXSW (_TIF_DEBUG|_TIF_IO_BITMAP) +#define _TIF_WORK_CTXSW_NEXT (_TIF_IO_BITMAP | _TIF_NOTSC | _TIF_DEBUG) +#define _TIF_WORK_CTXSW_PREV (_TIF_IO_BITMAP | _TIF_NOTSC) /* * Thread-synchronous status. diff --git a/include/linux/seccomp.h b/include/linux/seccomp.h index d708974..262a8dc 100644 --- a/include/linux/seccomp.h +++ b/include/linux/seccomp.h @@ -16,11 +16,6 @@ static inline void secure_computing(int this_syscall) __secure_computing(this_syscall); } -static inline int has_secure_computing(struct thread_info *ti) -{ - return unlikely(test_ti_thread_flag(ti, TIF_SECCOMP)); -} - extern long prctl_get_seccomp(void); extern long prctl_set_seccomp(unsigned long); @@ -29,11 +24,6 @@ extern long prctl_set_seccomp(unsigned long); typedef struct { } seccomp_t; #define secure_computing(x) do { } while (0) -/* static inline to preserve typechecking */ -static inline int has_secure_computing(struct thread_info *ti) -{ - return 0; -} static inline long prctl_get_seccomp(void) { |