# # IrDA protocol configuration # menuconfig IRDA depends on NET && !S390 tristate "IrDA (infrared) subsystem support" select CRC_CCITT ---help--- Say Y here if you want to build support for the IrDA (TM) protocols. The Infrared Data Associations (tm) specifies standards for wireless infrared communication and is supported by most laptops and PDA's. To use Linux support for the IrDA (tm) protocols, you will also need some user-space utilities like irattach. For more information, see the file . You also want to read the IR-HOWTO, available at . If you want to exchange bits of data (vCal, vCard) with a PDA, you will need to install some OBEX application, such as OpenObex : To compile this support as a module, choose M here: the module will be called irda. comment "IrDA protocols" depends on IRDA source "net/irda/irlan/Kconfig" source "net/irda/irnet/Kconfig" source "net/irda/ircomm/Kconfig" config IRDA_ULTRA bool "Ultra (connectionless) protocol" depends on IRDA help Say Y here to support the connectionless Ultra IRDA protocol. Ultra allows to exchange data over IrDA with really simple devices (watch, beacon) without the overhead of the IrDA protocol (no handshaking, no management frames, simple fixed header). Ultra is available as a special socket : socket(AF_IRDA, SOCK_DGRAM, 1); comment "IrDA options" depends on IRDA config IRDA_CACHE_LAST_LSAP bool "Cache last LSAP" depends on IRDA help Say Y here if you want IrLMP to cache the last LSAP used. This makes sense since most frames will be sent/received on the same connection. Enabling this option will save a hash-lookup per frame. If unsure, say Y. config IRDA_FAST_RR bool "Fast RRs (low latency)" depends on IRDA ---help--- Say Y here is you want IrLAP to send fast RR (Receive Ready) frames when acting as a primary station. Disabling this option will make latency over IrDA very bad. Enabling this option will make the IrDA stack send more packet than strictly necessary, thus reduce your battery life (but not that much). Fast RR will make IrLAP send out a RR frame immediately when receiving a frame if its own transmit queue is currently empty. This will give a lot of speed improvement when receiving much data since the secondary station will not have to wait the max. turn around time (usually 500ms) before it is allowed to transmit the next time. If the transmit queue of the secondary is also empty, the primary will start backing-off before sending another RR frame, waiting longer each time until the back-off reaches the max. turn around time. This back-off increase in controlled via /proc/sys/net/irda/fast_poll_increase If unsure, say Y. config IRDA_DEBUG bool "Debug information" depends on IRDA help Say Y here if you want the IrDA subsystem to write debug information to your syslog. You can change the debug level in /proc/sys/net/irda/debug . When this option is enabled, the IrDA also perform many extra internal verifications which will usually prevent the kernel to crash in case of bugs. If unsure, say Y (since it makes it easier to find the bugs). source "drivers/net/irda/Kconfig" ns
context:
space:
mode:
authorJiri Kosina <jkosina@suse.cz>2017-01-27 22:25:52 +0000
committerIngo Molnar <mingo@kernel.org>2017-01-28 09:18:56 +0100
commitbf29bddf0417a4783da3b24e8c9e017ac649326f (patch)
tree54a05a4883b73f80e4e1d8c4b15750aa01c39932 /sound/pci/echoaudio/Makefile
parent883af14e67e8b8702b5560aa64c888c0cd0bd66c (diff)
x86/efi: Always map the first physical page into the EFI pagetables
Commit: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") stopped creating 1:1 mappings for all RAM, when running in native 64-bit mode. It turns out though that there are 64-bit EFI implementations in the wild (this particular problem has been reported on a Lenovo Yoga 710-11IKB), which still make use of the first physical page for their own private use, even though they explicitly mark it EFI_CONVENTIONAL_MEMORY in the memory map. In case there is no mapping for this particular frame in the EFI pagetables, as soon as firmware tries to make use of it, a triple fault occurs and the system reboots (in case of the Yoga 710-11IKB this is very early during bootup). Fix that by always mapping the first page of physical memory into the EFI pagetables. We're free to hand this page to the BIOS, as trim_bios_range() will reserve the first page and isolate it away from memory allocators anyway. Note that just reverting 129766708 alone is not enough on v4.9-rc1+ to fix the regression on affected hardware, as this commit: ab72a27da ("x86/efi: Consolidate region mapping logic") later made the first physical frame not to be mapped anyway. Reported-by: Hanka Pavlikova <hanka@ucw.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Laura Abbott <labbott@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vojtech Pavlik <vojtech@ucw.cz> Cc: Waiman Long <waiman.long@hpe.com> Cc: linux-efi@vger.kernel.org Cc: stable@kernel.org # v4.8+ Fixes: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") Link: http://lkml.kernel.org/r/20170127222552.22336-1-matt@codeblueprint.co.uk [ Tidied up the changelog and the comment. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'sound/pci/echoaudio/Makefile')