From aa1e0e3bcf95ce684d005bedb16e5d4559455685 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Thu, 2 Oct 2008 19:18:09 -0400 Subject: [PATCH] ring_buffer: map to cpu not page My original patch had a compile bug when NUMA was configured. I referenced cpu when it should have been cpu_buffer->cpu. Ingo quickly fixed this bug by replacing cpu with 'i' because that was the loop counter. Unfortunately, the 'i' was the counter of pages, not CPUs. This caused a crash when the number of pages allocated for the buffers exceeded the number of pages, which would usually be the case. Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar --- kernel/trace/ring_buffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 54a3098..6b8dac0 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -232,7 +232,7 @@ static int rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer, for (i = 0; i < nr_pages; i++) { page = kzalloc_node(ALIGN(sizeof(*page), cache_line_size()), - GFP_KERNEL, cpu_to_node(i)); + GFP_KERNEL, cpu_to_node(cpu_buffer->cpu)); if (!page) goto free_pages; list_add(&page->list, &pages); -- 2.7.4