From 23c887522e912ca494950796a95df8dd210f4b01 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Sat, 10 Feb 2007 01:45:05 -0800 Subject: [PATCH] Relay: add CPU hotplug support Mathieu originally needed to add this for tracing Xen, but it's something that's needed for any application that can be tracing while cpus are added. unplug isn't supported by this patch. The thought was that at minumum a new buffer needs to be added when a cpu comes up, but it wasn't worth the effort to remove buffers on cpu down since they'd be freed soon anyway when the channel was closed. [zanussi@us.ibm.com: avoid lock_cpu_hotplug deadlock] Signed-off-by: Mathieu Desnoyers Cc: Tom Zanussi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- block/blktrace.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'block') diff --git a/block/blktrace.c b/block/blktrace.c index d3679dd1d220..d36b32ed22f4 100644 --- a/block/blktrace.c +++ b/block/blktrace.c @@ -363,10 +363,9 @@ static int blk_trace_setup(request_queue_t *q, struct block_device *bdev, if (!bt->dropped_file) goto err; - bt->rchan = relay_open("trace", dir, buts.buf_size, buts.buf_nr, &blk_relay_callbacks); + bt->rchan = relay_open("trace", dir, buts.buf_size, buts.buf_nr, &blk_relay_callbacks, bt); if (!bt->rchan) goto err; - bt->rchan->private_data = bt; bt->act_mask = buts.act_mask; if (!bt->act_mask) -- cgit v1.2.3-59-g8ed1b