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ring-buffer: change "page" variable names to "bpage"
Impact: clean up Andrew Morton pointed out that the kernel convention of a variable named page should be of type page struct. The ring buffer uses a variable named "page" for a pointer to something else. This patch converts those to be called "bpage" (as in "buffer page"). Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt
Ingo Molnar
parent
14a866c567
commit
044fa782eb
@ -208,9 +208,9 @@ struct buffer_page {
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struct buffer_data_page *page; /* Actual data page */
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};
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static void rb_init_page(struct buffer_data_page *page)
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static void rb_init_page(struct buffer_data_page *bpage)
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{
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local_set(&page->commit, 0);
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local_set(&bpage->commit, 0);
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}
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/*
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@ -298,19 +298,19 @@ struct ring_buffer_iter {
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static int rb_check_pages(struct ring_buffer_per_cpu *cpu_buffer)
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{
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struct list_head *head = &cpu_buffer->pages;
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struct buffer_page *page, *tmp;
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struct buffer_page *bpage, *tmp;
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if (RB_WARN_ON(cpu_buffer, head->next->prev != head))
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return -1;
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if (RB_WARN_ON(cpu_buffer, head->prev->next != head))
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return -1;
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list_for_each_entry_safe(page, tmp, head, list) {
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list_for_each_entry_safe(bpage, tmp, head, list) {
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if (RB_WARN_ON(cpu_buffer,
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page->list.next->prev != &page->list))
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bpage->list.next->prev != &bpage->list))
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return -1;
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if (RB_WARN_ON(cpu_buffer,
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page->list.prev->next != &page->list))
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bpage->list.prev->next != &bpage->list))
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return -1;
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}
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@ -321,23 +321,23 @@ static int rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer,
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unsigned nr_pages)
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{
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struct list_head *head = &cpu_buffer->pages;
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struct buffer_page *page, *tmp;
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struct buffer_page *bpage, *tmp;
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unsigned long addr;
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LIST_HEAD(pages);
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unsigned i;
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for (i = 0; i < nr_pages; i++) {
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page = kzalloc_node(ALIGN(sizeof(*page), cache_line_size()),
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bpage = kzalloc_node(ALIGN(sizeof(*bpage), cache_line_size()),
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GFP_KERNEL, cpu_to_node(cpu_buffer->cpu));
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if (!page)
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if (!bpage)
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goto free_pages;
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list_add(&page->list, &pages);
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list_add(&bpage->list, &pages);
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addr = __get_free_page(GFP_KERNEL);
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if (!addr)
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goto free_pages;
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page->page = (void *)addr;
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rb_init_page(page->page);
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bpage->page = (void *)addr;
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rb_init_page(bpage->page);
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}
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list_splice(&pages, head);
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@ -347,9 +347,9 @@ static int rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer,
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return 0;
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free_pages:
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list_for_each_entry_safe(page, tmp, &pages, list) {
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list_del_init(&page->list);
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free_buffer_page(page);
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list_for_each_entry_safe(bpage, tmp, &pages, list) {
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list_del_init(&bpage->list);
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free_buffer_page(bpage);
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}
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return -ENOMEM;
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}
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@ -358,7 +358,7 @@ static struct ring_buffer_per_cpu *
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rb_allocate_cpu_buffer(struct ring_buffer *buffer, int cpu)
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{
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struct ring_buffer_per_cpu *cpu_buffer;
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struct buffer_page *page;
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struct buffer_page *bpage;
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unsigned long addr;
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int ret;
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@ -373,17 +373,17 @@ rb_allocate_cpu_buffer(struct ring_buffer *buffer, int cpu)
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cpu_buffer->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
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INIT_LIST_HEAD(&cpu_buffer->pages);
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page = kzalloc_node(ALIGN(sizeof(*page), cache_line_size()),
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bpage = kzalloc_node(ALIGN(sizeof(*bpage), cache_line_size()),
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GFP_KERNEL, cpu_to_node(cpu));
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if (!page)
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if (!bpage)
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goto fail_free_buffer;
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cpu_buffer->reader_page = page;
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cpu_buffer->reader_page = bpage;
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addr = __get_free_page(GFP_KERNEL);
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if (!addr)
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goto fail_free_reader;
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page->page = (void *)addr;
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rb_init_page(page->page);
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bpage->page = (void *)addr;
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rb_init_page(bpage->page);
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INIT_LIST_HEAD(&cpu_buffer->reader_page->list);
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@ -408,14 +408,14 @@ rb_allocate_cpu_buffer(struct ring_buffer *buffer, int cpu)
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static void rb_free_cpu_buffer(struct ring_buffer_per_cpu *cpu_buffer)
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{
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struct list_head *head = &cpu_buffer->pages;
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struct buffer_page *page, *tmp;
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struct buffer_page *bpage, *tmp;
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list_del_init(&cpu_buffer->reader_page->list);
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free_buffer_page(cpu_buffer->reader_page);
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list_for_each_entry_safe(page, tmp, head, list) {
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list_del_init(&page->list);
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free_buffer_page(page);
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list_for_each_entry_safe(bpage, tmp, head, list) {
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list_del_init(&bpage->list);
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free_buffer_page(bpage);
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}
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kfree(cpu_buffer);
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}
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@ -512,7 +512,7 @@ static void rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer);
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static void
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rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned nr_pages)
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{
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struct buffer_page *page;
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struct buffer_page *bpage;
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struct list_head *p;
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unsigned i;
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@ -523,9 +523,9 @@ rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned nr_pages)
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if (RB_WARN_ON(cpu_buffer, list_empty(&cpu_buffer->pages)))
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return;
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p = cpu_buffer->pages.next;
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page = list_entry(p, struct buffer_page, list);
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list_del_init(&page->list);
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free_buffer_page(page);
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bpage = list_entry(p, struct buffer_page, list);
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list_del_init(&bpage->list);
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free_buffer_page(bpage);
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}
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if (RB_WARN_ON(cpu_buffer, list_empty(&cpu_buffer->pages)))
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return;
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@ -542,7 +542,7 @@ static void
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rb_insert_pages(struct ring_buffer_per_cpu *cpu_buffer,
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struct list_head *pages, unsigned nr_pages)
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{
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struct buffer_page *page;
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struct buffer_page *bpage;
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struct list_head *p;
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unsigned i;
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@ -553,9 +553,9 @@ rb_insert_pages(struct ring_buffer_per_cpu *cpu_buffer,
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if (RB_WARN_ON(cpu_buffer, list_empty(pages)))
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return;
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p = pages->next;
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page = list_entry(p, struct buffer_page, list);
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list_del_init(&page->list);
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list_add_tail(&page->list, &cpu_buffer->pages);
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bpage = list_entry(p, struct buffer_page, list);
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list_del_init(&bpage->list);
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list_add_tail(&bpage->list, &cpu_buffer->pages);
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}
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rb_reset_cpu(cpu_buffer);
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@ -582,7 +582,7 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
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{
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struct ring_buffer_per_cpu *cpu_buffer;
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unsigned nr_pages, rm_pages, new_pages;
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struct buffer_page *page, *tmp;
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struct buffer_page *bpage, *tmp;
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unsigned long buffer_size;
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unsigned long addr;
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LIST_HEAD(pages);
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@ -643,17 +643,17 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
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for_each_buffer_cpu(buffer, cpu) {
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for (i = 0; i < new_pages; i++) {
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page = kzalloc_node(ALIGN(sizeof(*page),
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bpage = kzalloc_node(ALIGN(sizeof(*bpage),
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cache_line_size()),
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GFP_KERNEL, cpu_to_node(cpu));
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if (!page)
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if (!bpage)
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goto free_pages;
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list_add(&page->list, &pages);
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list_add(&bpage->list, &pages);
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addr = __get_free_page(GFP_KERNEL);
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if (!addr)
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goto free_pages;
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page->page = (void *)addr;
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rb_init_page(page->page);
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bpage->page = (void *)addr;
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rb_init_page(bpage->page);
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}
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}
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@ -674,9 +674,9 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
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return size;
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free_pages:
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list_for_each_entry_safe(page, tmp, &pages, list) {
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list_del_init(&page->list);
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free_buffer_page(page);
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list_for_each_entry_safe(bpage, tmp, &pages, list) {
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list_del_init(&bpage->list);
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free_buffer_page(bpage);
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}
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mutex_unlock(&buffer->mutex);
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return -ENOMEM;
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@ -688,14 +688,14 @@ static inline int rb_null_event(struct ring_buffer_event *event)
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}
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static inline void *
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__rb_data_page_index(struct buffer_data_page *page, unsigned index)
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__rb_data_page_index(struct buffer_data_page *bpage, unsigned index)
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{
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return page->data + index;
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return bpage->data + index;
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}
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static inline void *__rb_page_index(struct buffer_page *page, unsigned index)
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static inline void *__rb_page_index(struct buffer_page *bpage, unsigned index)
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{
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return page->page->data + index;
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return bpage->page->data + index;
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}
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static inline struct ring_buffer_event *
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@ -771,14 +771,14 @@ static void rb_update_overflow(struct ring_buffer_per_cpu *cpu_buffer)
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}
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static inline void rb_inc_page(struct ring_buffer_per_cpu *cpu_buffer,
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struct buffer_page **page)
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struct buffer_page **bpage)
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{
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struct list_head *p = (*page)->list.next;
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struct list_head *p = (*bpage)->list.next;
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if (p == &cpu_buffer->pages)
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p = p->next;
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*page = list_entry(p, struct buffer_page, list);
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*bpage = list_entry(p, struct buffer_page, list);
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}
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static inline unsigned
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@ -2239,16 +2239,16 @@ int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
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}
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static void rb_remove_entries(struct ring_buffer_per_cpu *cpu_buffer,
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struct buffer_data_page *page)
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struct buffer_data_page *bpage)
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{
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struct ring_buffer_event *event;
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unsigned long head;
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__raw_spin_lock(&cpu_buffer->lock);
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for (head = 0; head < local_read(&page->commit);
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for (head = 0; head < local_read(&bpage->commit);
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head += rb_event_length(event)) {
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event = __rb_data_page_index(page, head);
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event = __rb_data_page_index(bpage, head);
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if (RB_WARN_ON(cpu_buffer, rb_null_event(event)))
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return;
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/* Only count data entries */
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@ -2277,15 +2277,15 @@ static void rb_remove_entries(struct ring_buffer_per_cpu *cpu_buffer,
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void *ring_buffer_alloc_read_page(struct ring_buffer *buffer)
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{
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unsigned long addr;
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struct buffer_data_page *page;
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struct buffer_data_page *bpage;
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addr = __get_free_page(GFP_KERNEL);
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if (!addr)
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return NULL;
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page = (void *)addr;
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bpage = (void *)addr;
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return page;
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return bpage;
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}
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/**
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@ -2337,15 +2337,15 @@ int ring_buffer_read_page(struct ring_buffer *buffer,
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{
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struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
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struct ring_buffer_event *event;
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struct buffer_data_page *page;
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struct buffer_data_page *bpage;
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unsigned long flags;
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int ret = 0;
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if (!data_page)
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return 0;
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page = *data_page;
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if (!page)
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bpage = *data_page;
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if (!bpage)
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return 0;
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spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
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@ -2372,26 +2372,26 @@ int ring_buffer_read_page(struct ring_buffer *buffer,
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if (full)
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goto out;
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/* The writer is still on the reader page, we must copy */
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page = cpu_buffer->reader_page->page;
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memcpy(page->data,
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bpage = cpu_buffer->reader_page->page;
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memcpy(bpage->data,
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cpu_buffer->reader_page->page->data + read,
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local_read(&page->commit) - read);
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local_read(&bpage->commit) - read);
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/* consume what was read */
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cpu_buffer->reader_page += read;
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} else {
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/* swap the pages */
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rb_init_page(page);
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page = cpu_buffer->reader_page->page;
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rb_init_page(bpage);
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bpage = cpu_buffer->reader_page->page;
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cpu_buffer->reader_page->page = *data_page;
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cpu_buffer->reader_page->read = 0;
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*data_page = page;
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*data_page = bpage;
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}
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ret = 1;
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/* update the entry counter */
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rb_remove_entries(cpu_buffer, page);
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rb_remove_entries(cpu_buffer, bpage);
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out:
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spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
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