litmus-rt.git - The LITMUS^RT kernel.

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author	FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>	2010-05-26 17:44:20 -0400
committer	Linus Torvalds <torvalds@linux-foundation.org>	2010-05-27 12:12:52 -0400
commit	6d256fa8868b4509310ea201c2d2c04fabea96ab (patch)
tree	490cf66c4f1fcf8743a0fb99a920859d0219727d /include/linux/net_tstamp.h
parent	f671be04dcda09f8383ae26072c0e75a79090193 (diff)

Staging: saa7134-go7007: replace dma_sync_single with dma_sync_single_for_cpu

dma_sync_single() is deprecated and will be removed soon. No functional change since dma_sync_single is the wrapper of dma_sync_single_for_cpu. saa7134-go7007.c is commented out but anyway let's replace it. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Greg Kroah-Hartman <gregkh@suse.de> Cc: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Diffstat (limited to 'include/linux/net_tstamp.h')

0 files changed, 0 insertions, 0 deletions

/* * Functions related to io context handling */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/bio.h> #include <linux/blkdev.h> #include <linux/bootmem.h> /* for max_pfn/max_low_pfn */ #include "blk.h" /* * For io context allocations */ static struct kmem_cache *iocontext_cachep; static void cfq_dtor(struct io_context *ioc) { if (!hlist_empty(&ioc->cic_list)) { struct cfq_io_context *cic; cic = list_entry(ioc->cic_list.first, struct cfq_io_context, cic_list); cic->dtor(ioc); } } /* * IO Context helper functions. put_io_context() returns 1 if there are no * more users of this io context, 0 otherwise. */ int put_io_context(struct io_context *ioc) { if (ioc == NULL) return 1; BUG_ON(atomic_read(&ioc->refcount) == 0); if (atomic_dec_and_test(&ioc->refcount)) { rcu_read_lock(); if (ioc->aic && ioc->aic->dtor) ioc->aic->dtor(ioc->aic); cfq_dtor(ioc); rcu_read_unlock(); kmem_cache_free(iocontext_cachep, ioc); return 1; } return 0; } EXPORT_SYMBOL(put_io_context); static void cfq_exit(struct io_context *ioc) { rcu_read_lock(); if (!hlist_empty(&ioc->cic_list)) { struct cfq_io_context *cic; cic = list_entry(ioc->cic_list.first, struct cfq_io_context, cic_list); cic->exit(ioc); } rcu_read_unlock(); } /* Called by the exitting task */ void exit_io_context(void) { struct io_context *ioc; task_lock(current); ioc = current->io_context; current->io_context = NULL; task_unlock(current); if (atomic_dec_and_test(&ioc->nr_tasks)) { if (ioc->aic && ioc->aic->exit) ioc->aic->exit(ioc->aic); cfq_exit(ioc); put_io_context(ioc); } } struct io_context *alloc_io_context(gfp_t gfp_flags, int node) { struct io_context *ret; ret = kmem_cache_alloc_node(iocontext_cachep, gfp_flags, node); if (ret) { atomic_set(&ret->refcount, 1); atomic_set(&ret->nr_tasks, 1); spin_lock_init(&ret->lock); ret->ioprio_changed = 0; ret->ioprio = 0; ret->last_waited = jiffies; /* doesn't matter... */ ret->nr_batch_requests = 0; /* because this is 0 */ ret->aic = NULL; INIT_RADIX_TREE(&ret->radix_root, GFP_ATOMIC | __GFP_HIGH); INIT_HLIST_HEAD(&ret->cic_list); ret->ioc_data = NULL; } return ret; } /* * If the current task has no IO context then create one and initialise it. * Otherwise, return its existing IO context. * * This returned IO context doesn't have a specifically elevated refcount, * but since the current task itself holds a reference, the context can be * used in general code, so long as it stays within `current` context. */ struct io_context *current_io_context(gfp_t gfp_flags, int node) { struct task_struct *tsk = current; struct io_context *ret; ret = tsk->io_context; if (likely(ret)) return ret; ret = alloc_io_context(gfp_flags, node); if (ret) { /* make sure set_task_ioprio() sees the settings above */ smp_wmb(); tsk->io_context = ret; } return ret; } /* * If the current task has no IO context then create one and initialise it. * If it does have a context, take a ref on it. * * This is always called in the context of the task which submitted the I/O. */ struct io_context *get_io_context(gfp_t gfp_flags, int node) { struct io_context *ret = NULL; /* * Check for unlikely race with exiting task. ioc ref count is * zero when ioc is being detached. */ do { ret = current_io_context(gfp_flags, node); if (unlikely(!ret)) break; } while (!atomic_inc_not_zero(&ret->refcount)); return ret; } EXPORT_SYMBOL(get_io_context); void copy_io_context(struct io_context **pdst, struct io_context **psrc) { struct io_context *src = *psrc; struct io_context *dst = *pdst; if (src) { BUG_ON(atomic_read(&src->refcount) == 0); atomic_inc(&src->refcount); put_io_context(dst); *pdst = src; } } EXPORT_SYMBOL(copy_io_context); static int __init blk_ioc_init(void) { iocontext_cachep = kmem_cache_create("blkdev_ioc", sizeof(struct io_context), 0, SLAB_PANIC, NULL); return 0; } subsys_initcall(blk_ioc_init);


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