/* * Copyright (C) 2007, 2008 Karsten Wiese * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef _UAPI__SOUND_USB_STREAM_H #define _UAPI__SOUND_USB_STREAM_H #define USB_STREAM_INTERFACE_VERSION 2 #define SNDRV_USB_STREAM_IOCTL_SET_PARAMS \ _IOW('H', 0x90, struct usb_stream_config) struct usb_stream_packet { unsigned offset; unsigned length; }; struct usb_stream_config { unsigned version; unsigned sample_rate; unsigned period_frames; unsigned frame_size; }; struct usb_stream { struct usb_stream_config cfg; unsigned read_size; unsigned write_size; int period_size; unsigned state; int idle_insize; int idle_outsize; int sync_packet; unsigned insize_done; unsigned periods_done; unsigned periods_polled; struct usb_stream_packet outpacket[2]; unsigned inpackets; unsigned inpacket_head; unsigned inpacket_split; unsigned inpacket_split_at; unsigned next_inpacket_split; unsigned next_inpacket_split_at; struct usb_stream_packet inpacket[0]; }; enum usb_stream_state { usb_stream_invalid, usb_stream_stopped, usb_stream_sync0, usb_stream_sync1, usb_stream_ready, usb_stream_running, usb_stream_xrun, }; #endif /* _UAPI__SOUND_USB_STREAM_H */ t.git/commit/include/uapi?id=d407bd25a204bd66b7346dde24bd3d37ef0e0b05'>commitdiff
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authorDaniel Borkmann <daniel@iogearbox.net>2017-01-18 15:14:17 +0100
committerDavid S. Miller <davem@davemloft.net>2017-01-18 17:12:26 -0500
commitd407bd25a204bd66b7346dde24bd3d37ef0e0b05 (patch)
tree01e49e08ca4f4eb258a2e2d9c67d03d503498696 /include/uapi
parent9ed59592e3e379b2e9557dc1d9e9ec8fcbb33f16 (diff)
bpf: don't trigger OOM killer under pressure with map alloc
This patch adds two helpers, bpf_map_area_alloc() and bpf_map_area_free(), that are to be used for map allocations. Using kmalloc() for very large allocations can cause excessive work within the page allocator, so i) fall back earlier to vmalloc() when the attempt is considered costly anyway, and even more importantly ii) don't trigger OOM killer with any of the allocators. Since this is based on a user space request, for example, when creating maps with element pre-allocation, we really want such requests to fail instead of killing other user space processes. Also, don't spam the kernel log with warnings should any of the allocations fail under pressure. Given that, we can make backend selection in bpf_map_area_alloc() generic, and convert all maps over to use this API for spots with potentially large allocation requests. Note, replacing the one kmalloc_array() is fine as overflow checks happen earlier in htab_map_alloc(), since it must also protect the multiplication for vmalloc() should kmalloc_array() fail. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/uapi')