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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
* 'for-linus' of git://git.kernel.dk/linux-2.6-block: blktrace: kill the unneeded initcall block: fix blktrace timestamps loop: fix bad bio_alloc() nr_iovec request Don't blatt first element of prv in sg_chain()
This commit is contained in:
commit
b506d1b6c4
3 changed files with 6 additions and 81 deletions
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@ -25,7 +25,6 @@
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#include <linux/time.h>
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#include <asm/uaccess.h>
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static DEFINE_PER_CPU(unsigned long long, blk_trace_cpu_offset) = { 0, };
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static unsigned int blktrace_seq __read_mostly = 1;
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/*
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@ -41,7 +40,7 @@ static void trace_note(struct blk_trace *bt, pid_t pid, int action,
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const int cpu = smp_processor_id();
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t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
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t->time = cpu_clock(cpu) - per_cpu(blk_trace_cpu_offset, cpu);
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t->time = ktime_to_ns(ktime_get());
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t->device = bt->dev;
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t->action = action;
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t->pid = pid;
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@ -159,7 +158,7 @@ void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
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t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
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t->sequence = ++(*sequence);
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t->time = cpu_clock(cpu) - per_cpu(blk_trace_cpu_offset, cpu);
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t->time = ktime_to_ns(ktime_get());
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t->sector = sector;
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t->bytes = bytes;
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t->action = what;
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@ -179,7 +178,7 @@ void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
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EXPORT_SYMBOL_GPL(__blk_add_trace);
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static struct dentry *blk_tree_root;
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static struct mutex blk_tree_mutex;
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static DEFINE_MUTEX(blk_tree_mutex);
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static unsigned int root_users;
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static inline void blk_remove_root(void)
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@ -505,77 +504,3 @@ void blk_trace_shutdown(struct request_queue *q)
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blk_trace_remove(q);
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}
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}
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/*
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* Average offset over two calls to cpu_clock() with a gettimeofday()
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* in the middle
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*/
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static void blk_check_time(unsigned long long *t, int this_cpu)
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{
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unsigned long long a, b;
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struct timeval tv;
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a = cpu_clock(this_cpu);
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do_gettimeofday(&tv);
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b = cpu_clock(this_cpu);
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*t = tv.tv_sec * 1000000000 + tv.tv_usec * 1000;
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*t -= (a + b) / 2;
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}
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/*
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* calibrate our inter-CPU timings
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*/
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static void blk_trace_check_cpu_time(void *data)
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{
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unsigned long long *t;
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int this_cpu = get_cpu();
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t = &per_cpu(blk_trace_cpu_offset, this_cpu);
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/*
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* Just call it twice, hopefully the second call will be cache hot
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* and a little more precise
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*/
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blk_check_time(t, this_cpu);
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blk_check_time(t, this_cpu);
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put_cpu();
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}
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static void blk_trace_set_ht_offsets(void)
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{
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#if defined(CONFIG_SCHED_SMT)
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int cpu, i;
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/*
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* now make sure HT siblings have the same time offset
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*/
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preempt_disable();
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for_each_online_cpu(cpu) {
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unsigned long long *cpu_off, *sibling_off;
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for_each_cpu_mask(i, per_cpu(cpu_sibling_map, cpu)) {
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if (i == cpu)
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continue;
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cpu_off = &per_cpu(blk_trace_cpu_offset, cpu);
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sibling_off = &per_cpu(blk_trace_cpu_offset, i);
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*sibling_off = *cpu_off;
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}
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}
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preempt_enable();
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#endif
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}
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static __init int blk_trace_init(void)
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{
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mutex_init(&blk_tree_mutex);
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on_each_cpu(blk_trace_check_cpu_time, NULL, 1, 1);
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blk_trace_set_ht_offsets();
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return 0;
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}
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module_init(blk_trace_init);
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@ -610,7 +610,7 @@ static int loop_thread(void *data)
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static int loop_switch(struct loop_device *lo, struct file *file)
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{
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struct switch_request w;
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struct bio *bio = bio_alloc(GFP_KERNEL, 1);
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struct bio *bio = bio_alloc(GFP_KERNEL, 0);
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if (!bio)
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return -ENOMEM;
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init_completion(&w.wait);
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@ -191,8 +191,8 @@ static inline void sg_chain(struct scatterlist *prv, unsigned int prv_nents,
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/*
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* offset and length are unused for chain entry. Clear them.
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*/
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prv->offset = 0;
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prv->length = 0;
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prv[prv_nents - 1].offset = 0;
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prv[prv_nents - 1].length = 0;
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/*
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* Set lowest bit to indicate a link pointer, and make sure to clear
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