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make seccomp zerocost in schedule

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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>
This commit is contained in:
Andrea Arcangeli 2007-07-15 23:41:33 -07:00 • committed by Linus Torvalds
parent 1d9d02feee
commit cf99abace7
5 changed files with 50 additions and 45 deletions
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10
include/linux/seccomp.h
View file

@ -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)
{