mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-14 04:26:45 +00:00
b8d1fd7ec6
Instead of attributing a variable to itself to silence the compiler, use
the attribute designed for that, avoiding this:
In file included from bench/futex-hash.c:24:
bench/futex.h:95:7: error: explicitly assigning value of variable of type 'pthread_attr_t *' to itself [-Werror,-Wself-assign]
attr = attr;
~~~~ ^ ~~~~
bench/futex.h:96:13: error: explicitly assigning value of variable of type 'size_t' (aka 'unsigned long') to itself [-Werror,-Wself-assign]
cpusetsize = cpusetsize;
~~~~~~~~~~ ^ ~~~~~~~~~~
bench/futex.h:97:9: error: explicitly assigning value of variable of type 'cpu_set_t *' (aka 'struct cpu_set_t *') to itself [-Werror,-Wself-assign]
cpuset = cpuset;
~~~~~~ ^ ~~~~~~
That is only triggered when HAVE_PTHREAD_ATTR_SETAFFINITY_NP isn't set.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-14ws1d1elj2d5ej8g7cwdqau@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/*
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* Glibc independent futex library for testing kernel functionality.
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* Shamelessly stolen from Darren Hart <dvhltc@us.ibm.com>
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* http://git.kernel.org/cgit/linux/kernel/git/dvhart/futextest.git/
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*/
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#ifndef _FUTEX_H
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#define _FUTEX_H
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <linux/futex.h>
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/**
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* futex() - SYS_futex syscall wrapper
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* @uaddr: address of first futex
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* @op: futex op code
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* @val: typically expected value of uaddr, but varies by op
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* @timeout: typically an absolute struct timespec (except where noted
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* otherwise). Overloaded by some ops
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* @uaddr2: address of second futex for some ops\
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* @val3: varies by op
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* @opflags: flags to be bitwise OR'd with op, such as FUTEX_PRIVATE_FLAG
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*
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* futex() is used by all the following futex op wrappers. It can also be
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* used for misuse and abuse testing. Generally, the specific op wrappers
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* should be used instead. It is a macro instead of an static inline function as
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* some of the types over overloaded (timeout is used for nr_requeue for
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* example).
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*
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* These argument descriptions are the defaults for all
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* like-named arguments in the following wrappers except where noted below.
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*/
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#define futex(uaddr, op, val, timeout, uaddr2, val3, opflags) \
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syscall(SYS_futex, uaddr, op | opflags, val, timeout, uaddr2, val3)
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/**
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* futex_wait() - block on uaddr with optional timeout
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* @timeout: relative timeout
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*/
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static inline int
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futex_wait(u_int32_t *uaddr, u_int32_t val, struct timespec *timeout, int opflags)
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{
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return futex(uaddr, FUTEX_WAIT, val, timeout, NULL, 0, opflags);
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}
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/**
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* futex_wake() - wake one or more tasks blocked on uaddr
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* @nr_wake: wake up to this many tasks
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*/
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static inline int
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futex_wake(u_int32_t *uaddr, int nr_wake, int opflags)
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{
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return futex(uaddr, FUTEX_WAKE, nr_wake, NULL, NULL, 0, opflags);
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}
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/**
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* futex_lock_pi() - block on uaddr as a PI mutex
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*/
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static inline int
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futex_lock_pi(u_int32_t *uaddr, struct timespec *timeout, int opflags)
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{
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return futex(uaddr, FUTEX_LOCK_PI, 0, timeout, NULL, 0, opflags);
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}
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/**
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* futex_unlock_pi() - release uaddr as a PI mutex, waking the top waiter
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*/
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static inline int
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futex_unlock_pi(u_int32_t *uaddr, int opflags)
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{
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return futex(uaddr, FUTEX_UNLOCK_PI, 0, NULL, NULL, 0, opflags);
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}
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/**
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* futex_cmp_requeue() - requeue tasks from uaddr to uaddr2
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* @nr_wake: wake up to this many tasks
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* @nr_requeue: requeue up to this many tasks
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*/
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static inline int
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futex_cmp_requeue(u_int32_t *uaddr, u_int32_t val, u_int32_t *uaddr2, int nr_wake,
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int nr_requeue, int opflags)
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{
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return futex(uaddr, FUTEX_CMP_REQUEUE, nr_wake, nr_requeue, uaddr2,
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val, opflags);
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}
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#ifndef HAVE_PTHREAD_ATTR_SETAFFINITY_NP
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#include <pthread.h>
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#include <linux/compiler.h>
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static inline int pthread_attr_setaffinity_np(pthread_attr_t *attr __maybe_unused,
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size_t cpusetsize __maybe_unused,
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cpu_set_t *cpuset __maybe_unused)
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{
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return 0;
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}
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#endif
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#endif /* _FUTEX_H */
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