ring-buffer: Add rb_check_bpage in __rb_allocate_pages
It may be better to check each page is aligned by 4 bytes. The 2 least significant bits of the address will be used as flags. Link: https://lkml.kernel.org/r/20201015113842.2921-1-hqjagain@gmail.com Signed-off-by: Qiujun Huang <hqjagain@gmail.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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@ -1423,7 +1423,8 @@ static int rb_check_pages(struct ring_buffer_per_cpu *cpu_buffer)
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return 0;
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}
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static int __rb_allocate_pages(long nr_pages, struct list_head *pages, int cpu)
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static int __rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer,
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long nr_pages, struct list_head *pages)
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{
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struct buffer_page *bpage, *tmp;
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bool user_thread = current->mm != NULL;
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@ -1463,13 +1464,15 @@ static int __rb_allocate_pages(long nr_pages, struct list_head *pages, int cpu)
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struct page *page;
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bpage = kzalloc_node(ALIGN(sizeof(*bpage), cache_line_size()),
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mflags, cpu_to_node(cpu));
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mflags, cpu_to_node(cpu_buffer->cpu));
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if (!bpage)
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goto free_pages;
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rb_check_bpage(cpu_buffer, bpage);
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list_add(&bpage->list, pages);
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page = alloc_pages_node(cpu_to_node(cpu), mflags, 0);
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page = alloc_pages_node(cpu_to_node(cpu_buffer->cpu), mflags, 0);
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if (!page)
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goto free_pages;
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bpage->page = page_address(page);
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@ -1501,7 +1504,7 @@ static int rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer,
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WARN_ON(!nr_pages);
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if (__rb_allocate_pages(nr_pages, &pages, cpu_buffer->cpu))
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if (__rb_allocate_pages(cpu_buffer, nr_pages, &pages))
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return -ENOMEM;
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/*
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@ -2008,8 +2011,8 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size,
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* allocated without receiving ENOMEM
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*/
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INIT_LIST_HEAD(&cpu_buffer->new_pages);
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if (__rb_allocate_pages(cpu_buffer->nr_pages_to_update,
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&cpu_buffer->new_pages, cpu)) {
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if (__rb_allocate_pages(cpu_buffer, cpu_buffer->nr_pages_to_update,
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&cpu_buffer->new_pages)) {
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/* not enough memory for new pages */
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err = -ENOMEM;
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goto out_err;
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@ -2074,8 +2077,8 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size,
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INIT_LIST_HEAD(&cpu_buffer->new_pages);
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if (cpu_buffer->nr_pages_to_update > 0 &&
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__rb_allocate_pages(cpu_buffer->nr_pages_to_update,
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&cpu_buffer->new_pages, cpu_id)) {
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__rb_allocate_pages(cpu_buffer, cpu_buffer->nr_pages_to_update,
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&cpu_buffer->new_pages)) {
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err = -ENOMEM;
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goto out_err;
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}
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