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posix_types: Remove fd_set macros

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<asm/posix_types.h> includes a set of macros that operate on file
descriptors.  Way long ago those were exported to user space, but
nowadays they are #ifdef __KERNEL__.

However, they are nothing but standard (nonatomic) bit operations, and
we already have optimized versions of bit operations in the kernel.
We can't include <linux/bitops.h> in <asm/posix_types.h> but we can
move the definitions to <linux/time.h> and define them there in terms
of standard kernel bitops.

[ v2: folds the following fixes in:

  a) Stray space in __FD_SET(), reported by Andrew Morton
  b) #include <linux/string.h> needed for memset(), reported by Tony Luck ]

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Link: http://lkml.kernel.org/r/1328677745-20121-22-git-send-email-hpa@zytor.com
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
H. Peter Anvin 2012-02-07 21:09:05 -08:00
parent 2759e6512e
commit 8b3d1cda4f
2 changed files with 24 additions and 72 deletions
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72
include/asm-generic/posix_types.h
View file

@ -92,76 +92,4 @@ typedef char * __kernel_caddr_t;
typedef unsigned short __kernel_uid16_t;
typedef unsigned short __kernel_gid16_t;
#ifdef __KERNEL__
#undef __FD_SET
static inline void __FD_SET(unsigned long __fd, __kernel_fd_set *__fdsetp)
{
unsigned long __tmp = __fd / __NFDBITS;
unsigned long __rem = __fd % __NFDBITS;
__fdsetp->fds_bits[__tmp] |= (1UL<<__rem);
}
#undef __FD_CLR
static inline void __FD_CLR(unsigned long __fd, __kernel_fd_set *__fdsetp)
{
unsigned long __tmp = __fd / __NFDBITS;
unsigned long __rem = __fd % __NFDBITS;
__fdsetp->fds_bits[__tmp] &= ~(1UL<<__rem);
}
#undef __FD_ISSET
static inline int __FD_ISSET(unsigned long __fd, const __kernel_fd_set *__p)
{
unsigned long __tmp = __fd / __NFDBITS;
unsigned long __rem = __fd % __NFDBITS;
return (__p->fds_bits[__tmp] & (1UL<<__rem)) != 0;
}
/*
* This will unroll the loop for the normal constant case (8 ints,
* for a 256-bit fd_set)
*/
#undef __FD_ZERO
static inline void __FD_ZERO(__kernel_fd_set *__p)
{
unsigned long *__tmp = __p->fds_bits;
int __i;
if (__builtin_constant_p(__FDSET_LONGS)) {
switch (__FDSET_LONGS) {
case 16:
__tmp[ 0] = 0; __tmp[ 1] = 0;
__tmp[ 2] = 0; __tmp[ 3] = 0;
__tmp[ 4] = 0; __tmp[ 5] = 0;
__tmp[ 6] = 0; __tmp[ 7] = 0;
__tmp[ 8] = 0; __tmp[ 9] = 0;
__tmp[10] = 0; __tmp[11] = 0;
__tmp[12] = 0; __tmp[13] = 0;
__tmp[14] = 0; __tmp[15] = 0;
return;
case 8:
__tmp[ 0] = 0; __tmp[ 1] = 0;
__tmp[ 2] = 0; __tmp[ 3] = 0;
__tmp[ 4] = 0; __tmp[ 5] = 0;
__tmp[ 6] = 0; __tmp[ 7] = 0;
return;
case 4:
__tmp[ 0] = 0; __tmp[ 1] = 0;
__tmp[ 2] = 0; __tmp[ 3] = 0;
return;
}
}
__i = __FDSET_LONGS;
while (__i) {
__i--;
*__tmp = 0;
__tmp++;
}
}
#endif /* __KERNEL__ */
#endif /* __ASM_GENERIC_POSIX_TYPES_H */

24
include/linux/time.h
View file

@ -4,8 +4,11 @@
#include <linux/types.h>
#ifdef __KERNEL__
# include <linux/bitops.h>
# include <linux/cache.h>
# include <linux/posix_types.h>
# include <linux/seqlock.h>
# include <linux/string.h>
# include <linux/math64.h>
#endif
@ -256,6 +259,27 @@ static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
a->tv_nsec = ns;
}
static inline void __FD_SET(unsigned long __fd, __kernel_fd_set *__fdsetp)
{
__set_bit(__fd, __fdsetp->fds_bits);
}
static inline void __FD_CLR(unsigned long __fd, __kernel_fd_set *__fdsetp)
{
__clear_bit(__fd, __fdsetp->fds_bits);
}
static inline int __FD_ISSET(unsigned long __fd, const __kernel_fd_set *__fdsetp)
{
return test_bit(__fd, __fdsetp->fds_bits);
}
static inline void __FD_ZERO(__kernel_fd_set *__fdsetp)
{
memset(__fdsetp->fds_bits, 0, sizeof __fdsetp->fds_bits);
}
#endif /* __KERNEL__ */
#define NFDBITS __NFDBITS