On Tue, Sep 09, 2014 at 02:22:38PM -0400, Rafael Aquini wrote: > dma_pin_iovec_pages() eventually causes the page allocator to stumble across > it warning case when a request for contigous mem block gets order >= MAX_ORDER. > > trinity(11230): Randomness reseeded to 0xaf76756f > trinity: trinity(11230) Randomness reseeded to 0xaf76756f > [ 7442.617160] ------------[ cut here ]------------ > [ 7442.621890] WARNING: at mm/page_alloc.c:2410 __alloc_pages_nodemask+0x346/0xa00() > ... > [ 7442.797088] Call Trace: > [ 7442.799614] [<ffffffff81600bf7>] dump_stack+0x19/0x1b > [ 7442.804860] [<ffffffff8105f621>] warn_slowpath_common+0x61/0x80 > [ 7442.810944] [<ffffffff8105f6fa>] warn_slowpath_null+0x1a/0x20 > [ 7442.816858] [<ffffffff8113d016>] __alloc_pages_nodemask+0x346/0xa00 > [ 7442.823294] [<ffffffff81175f59>] alloc_pages_current+0xa9/0x170 > [ 7442.829364] [<ffffffff811384be>] __get_free_pages+0xe/0x50 > [ 7442.835009] [<ffffffff8118064e>] kmalloc_order_trace+0x2e/0xa0 > [ 7442.841005] [<ffffffff81182899>] __kmalloc+0x219/0x230 > [ 7442.846284] [<ffffffff81387c8b>] dma_pin_iovec_pages+0x9b/0x240 > [ 7442.852323] [<ffffffff8153ffb8>] tcp_recvmsg+0x888/0xd10 > ... > > dma_pin_iovec_pages() is actually being used for an unique callsite within > tcp_recvmsg() which falls back to skb_copy_datagram_iovec() if the first > routine fails to pin a DMA buffer for the iovec. The splatted calltrace is > more scary than other thing, so lets just prevent it from getting out to > the wild world. This patch also does a minor code style surgery on the > surrounding hunk. > > Signed-off-by: Rafael Aquini <aquini@xxxxxxxxxx> > --- > drivers/dma/iovlock.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/drivers/dma/iovlock.c b/drivers/dma/iovlock.c > index bb48a57..4cb8379 100644 > --- a/drivers/dma/iovlock.c > +++ b/drivers/dma/iovlock.c > @@ -69,9 +69,10 @@ struct dma_pinned_list *dma_pin_iovec_pages(struct iovec *iov, size_t len) > } while (iovec_len_used < len); > > /* single kmalloc for pinned list, page_list[], and the page arrays */ > - local_list = kmalloc(sizeof(*local_list) > - + (nr_iovecs * sizeof (struct dma_page_list)) > - + (iovec_pages_used * sizeof (struct page*)), GFP_KERNEL); > + local_list = kmalloc(sizeof(*local_list) + > + (nr_iovecs * sizeof(struct dma_page_list)) + > + (iovec_pages_used * sizeof(struct page *)), > + GFP_KERNEL | __GFP_NOWARN); > if (!local_list) > goto out; > > -- > 1.9.3 > Guys, what's the word here? Cheers, -- Rafael > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
