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76 lines
1.7 KiB
76 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* rtmutex API |
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*/ |
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#include <linux/spinlock.h> |
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#include <linux/export.h> |
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#define RT_MUTEX_BUILD_MUTEX |
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#define WW_RT |
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#include "rtmutex.c" |
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static int __sched |
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__ww_rt_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ww_ctx, |
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unsigned int state, unsigned long ip) |
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{ |
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struct lockdep_map __maybe_unused *nest_lock = NULL; |
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struct rt_mutex *rtm = &lock->base; |
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int ret; |
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might_sleep(); |
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if (ww_ctx) { |
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if (unlikely(ww_ctx == READ_ONCE(lock->ctx))) |
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return -EALREADY; |
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/* |
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* Reset the wounded flag after a kill. No other process can |
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* race and wound us here, since they can't have a valid owner |
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* pointer if we don't have any locks held. |
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*/ |
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if (ww_ctx->acquired == 0) |
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ww_ctx->wounded = 0; |
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#ifdef CONFIG_DEBUG_LOCK_ALLOC |
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nest_lock = &ww_ctx->dep_map; |
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#endif |
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} |
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mutex_acquire_nest(&rtm->dep_map, 0, 0, nest_lock, ip); |
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if (likely(rt_mutex_cmpxchg_acquire(&rtm->rtmutex, NULL, current))) { |
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if (ww_ctx) |
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ww_mutex_set_context_fastpath(lock, ww_ctx); |
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return 0; |
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} |
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ret = rt_mutex_slowlock(&rtm->rtmutex, ww_ctx, state); |
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if (ret) |
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mutex_release(&rtm->dep_map, ip); |
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return ret; |
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} |
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int __sched |
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ww_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ctx) |
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{ |
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return __ww_rt_mutex_lock(lock, ctx, TASK_UNINTERRUPTIBLE, _RET_IP_); |
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} |
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EXPORT_SYMBOL(ww_mutex_lock); |
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int __sched |
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ww_mutex_lock_interruptible(struct ww_mutex *lock, struct ww_acquire_ctx *ctx) |
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{ |
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return __ww_rt_mutex_lock(lock, ctx, TASK_INTERRUPTIBLE, _RET_IP_); |
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} |
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EXPORT_SYMBOL(ww_mutex_lock_interruptible); |
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void __sched ww_mutex_unlock(struct ww_mutex *lock) |
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{ |
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struct rt_mutex *rtm = &lock->base; |
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__ww_mutex_unlock(lock); |
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mutex_release(&rtm->dep_map, _RET_IP_); |
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__rt_mutex_unlock(&rtm->rtmutex); |
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} |
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EXPORT_SYMBOL(ww_mutex_unlock);
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