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authorAndrea Arcangeli <andrea@cpushare.com>2007-07-16 10:41:33 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 20:05:50 +0400
commitcf99abace7e07dd8491e7093a9a9ef11d48838ed (patch)
tree3b7cfd7c76c2c43e6ae3fdaaff3a50a752072424 /include
parent1d9d02feeee89e9132034d504c9a45eeaf618a3d (diff)
downloadlinux-cf99abace7e07dd8491e7093a9a9ef11d48838ed.tar.xz
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.h4
-rw-r--r--include/asm-i386/thread_info.h5
-rw-r--r--include/linux/seccomp.h10
3 files changed, 8 insertions, 11 deletions
diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h
index 94e0c147c165..422cffef00c9 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 4cb0f91ae64f..54424e045e01 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 d708974dbfe3..262a8dccfa81 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)
{