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Subject[PATCH 21/21] posix_types: Remove fd_set macros
Date
From: "H. Peter Anvin" <hpa@zytor.com>

<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.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Arnd Bergmann <arnd@arndb.de>
---
include/asm-generic/posix_types.h | 72 -------------------------------------
include/linux/time.h | 23 ++++++++++++
2 files changed, 23 insertions(+), 72 deletions(-)

diff --git a/include/asm-generic/posix_types.h b/include/asm-generic/posix_types.h
index ac21760..e294fe6 100644
--- a/include/asm-generic/posix_types.h
+++ b/include/asm-generic/posix_types.h
@@ -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 */
diff --git a/include/linux/time.h b/include/linux/time.h
index b306178..ca9b1e6 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -4,7 +4,9 @@
#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/math64.h>
#endif
@@ -256,6 +258,27 @@ 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
--
1.7.6.5


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