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* kernel: set default for KERNEL_BPF_KPROBE_OVERRIDEStijn Tintel2023-03-051-0/+1
| | | | | | | | | Without the default value this still causes a missing symbol. Disable by default as it depends on FUNCTION_ERROR_INJECTION, which is disabled in the generic config and we don't have a build symbol to enable that. Fixes: 500c37c56ff6 ("kernel: add missing symbol") Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
* kernel: set default values for ARM low level debugging symbolsRobert Marko2023-02-081-0/+6
| | | | | | | | | | | | | | | | | | | | | Set default values for KERNEL_DEBUG_LL and KERNEL_DEBUG_LL_UART_NONE again as both of these symbols are non visible if KERNEL_EARLY_PRINTK is not selected and KConfig wont write their value to .config. This usually is the intended behaviour, but in OpenWrt we are relying on the KConfig to set these and disable the debug console settings that multiple targets like mvebu have set in their kernel config. This was the behaviour before removing all of the "default n" settings as KConfig by default considers symbols disabled but they are not visible anymore and thus their value is not set in .config and build system then later does not override the values from target kernel config. So, to restore the behaviour to the previous one lets a default value for KERNEL_DEBUG_LL and KERNEL_DEBUG_LL_UART_NONE. Fixes: 8bc72ea7be39 ("treewide: strip useless default n Kconfig lines") Tested-by: Georgi Valkov <gvalkov@gmail.com> Signed-off-by: Robert Marko <robimarko@gmail.com>
* treewide: strip useless `default n` Kconfig linesTony Butler2023-02-031-49/+0
| | | | | | | | | | Kconfig docs say: > The default value deliberately defaults to 'n' in order to avoid > bloating the build. Apply this rule everywhere, to avoid more cloning of bad examples Signed-off-by: Tony Butler <spudz76@gmail.com>
* kernel: make it possible for packages to select page pool supportFelix Fietkau2023-01-291-0/+7
| | | | | | Will be used by the next mt76 update Signed-off-by: Felix Fietkau <nbd@nbd.name>
* build: config: cleanup impossible dependency logicTony Butler2022-12-031-1/+1
| | | | | | | | | some config `depends on` lines contained outdated kernel version checks that can no longer happen and had become non-operational; clean them up cosmetic change with no functional effect Signed-off-by: Tony Butler <spudz76@gmail.com>
* kernel: disable wireless extensions only when neededFelix Fietkau2022-09-221-0/+16
| | | | | | They are only needed by a few very old drivers Signed-off-by: Felix Fietkau <nbd@nbd.name>
* kernel: add KERNEL_DEBUG_VIRTUALFlorian Fainelli2022-07-071-0/+8
| | | | | | | | This option allows turning on CONFIG_DEBUG_VIRTUAL which is useful to debug incorrect uses of the virtual to physical and physical to virtual translations functions. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
* kernel: add KERNEL_BPF_EVENTS config optionStijn Tintel2022-05-181-1/+11
| | | | | | | | This is required to use BPF maps of type BPF_MAP_TYPE_PERF_EVENT_ARRAY for sending data from BPF programs to user-space for post-processing or logging. Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
* build: add option KERNEL_DEBUG_INFO_BTFTony Ambardar2022-05-181-0/+14
| | | | | | | | | | | | | | | | | | | | Generate BTF (BPF Type Format) information from DWARF debug info. This is embedded in the kernel and exported via sysfs as /sys/kernel/btf/vmlinux. BTF data enhances kernel portability and introspection for BPF programs. Selecting this also enables the dwarves host package which provides the pahole tool used for BTF encoding. Test using: "bpftool btf dump file /sys/kernel/btf/vmlinux format c" This needs to depend on KERNEL_DEBUG_INFO_REDUCED not being set, otherwise we can enable both KERNEL_DEBUG_INFO_BTF and KERNEL_DEBUG_INFO_REDUCED, which will result in undefined behaviour. Signed-off-by: Tony Ambardar <itugrok@yahoo.com> Signed-off-by: Felix Fietkau <nbd@nbd.name> [split DEBUG_INFO_REDUCED into separate commit, add dependency] Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
* kernel: add DEBUG_INFO_REDUCED config optionStijn Tintel2022-05-181-0/+14
| | | | | | | | Add DEBUG_INFO_REDUCED as a kernel config option and remove it from the kernel configs. This is in preparation of the upcoming option to enable BTF typeinfo, which is incompatible with DEBUG_INFO_REDUCED. Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
* kernel: add missing dependency to KERNEL_RPI_AXIPERFStijn Tintel2022-05-181-1/+1
| | | | | | | | This symbol is added by the bcm27xx target patches so it should depend on that target. Fixes: efd9463dcfe2 ("kernel: add missing symbol for bcm27xx") Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
* kernel: add missing symbol for bcm27xxStijn Tintel2022-05-171-0/+5
| | | | | | | | | When KERNEL_PERF_EVENTS is enabled in OpenWrt, the RPI_AXIPERF symbol is exposed. Add a build option for it to fix build failures with KERNEL_PERF_EVENTS enabled. Fixes: 20ea6adbf199 ("bcm27xx: add support for linux v5.15") Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
* kernel: add missing symbolStijn Tintel2022-04-021-0/+5
| | | | | | | Enabling KERNEL_KPROBES exposes KERNEL_BPF_KPROBE_OVERRIDE. Add a build option for it to fix build failures with KERNEL_KPROBES enabled. Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
* kernel: add kmod-vrfMarek Behún2022-02-011-0/+10
| | | | | | | | | | | Add option to compile kmod-vrf, support for Virtual Routing and Forwarding (Lite). This module depends on NET_L3_MASTER_DEV, which is a boolean kernel option, so we need to create a configuration option also for this, and make kmod-vrf depend on it. Signed-off-by: Marek Behún <kabel@kernel.org>
* kernel: enhance multicast routing supportMatthew Hagan2022-01-081-2/+22
| | | | | | | | | | | | | | Certain utilities, such as smcroute [1], require additional multicast routing options to be enabled, otherwise they will not function correctly. Enable these relevant dependancies when IPv4 and/or IPv6 multicast routing are enabled. [1] https://github.com/troglobit/smcroute/blob/master/README.md#linux-requirements This increases the uncompressed kernel size on MIPS 24kc by 8KBytes and the compressed kernel size by 1.8KBytes. Signed-off-by: Matthew Hagan <mnhagan88@gmail.com>
* kernel: remove non-existent config symbolsJianhui Zhao2021-11-201-5/+0
| | | | | | | The crashlog patch as not ported to kernel 5.4. Fixes: 4e0c54bc5bc8 ("kernel: add support for kernel 5.4") Signed-off-by: Jianhui Zhao <zhaojh329@gmail.com>
* kernel: add missing symbolStijn Tintel2021-11-151-0/+13
| | | | | | | Enabling KERNEL_FTRACE exposes the HIST_TRIGGERS triggers symbol. Add a build option for it to fix build failures with KERNEL_FTRACE enabled. Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
* kernel: fix KERNEL_KASAN_VMALLOC build optionStijn Tintel2021-11-071-1/+1
| | | | | | | It should be config, not CONFIG. Fixes: cbeab2cd9919 ("kernel: add another missing KASAN symbol") Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
* kernel: add missing keyword to KERNEL_KASAN_VMALLOCStijn Tintel2021-11-071-0/+1
| | | | | | | | The help keyword is missing, which breaks menuconfig etc. Fixes: cbeab2cd9919 ("kernel: add another missing KASAN symbol") Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
* kernel: add another missing KASAN symbolStijn Tintel2021-11-071-0/+16
| | | | | | | | | | Enabling KERNEL_KASAN exposes yet another missing symbol. This did not appear on bcm27xx but is appearing now on x86/64. Add a new kernel build option for KASAN_VMALLOC to fix build on x86/64 with KERNEL_KASAN enabled. Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be> Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
* kernel: add missing UBSAN config symbolsStijn Tintel2021-11-071-0/+23
| | | | | | | | | | | | | | Enabling KERNEL_UBSAN exposes several missing symbols. Add new kernel build options for UBSAN_BOUNDS and UBSAN_TRAP, disable CONFIG_TEST_UBSAN in the generic kernel configs and enable CONFIG_UBSAN_MISC in generic 5.10 config. The latter symbol was removed in later kernels, as it was causing some issues, so just disable it in 5.10 instead of adding a build option for it. Fixes build failures with KERNEL_UBSAN enabled. Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be> Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
* kernel: add missing KASAN config symbolsStijn Tintel2021-11-071-0/+7
| | | | | | | | | | | | | | Enabling KERNEL_KASAN exposes several missing symbols. As KASAN_SW_TAGS is only implemented for arm64 CPUs and requires clang, it doesn't make sense to make this a build option so just default to KASAN_GENERIC and disable KASAN_SW_TAGS. While at it, disable TEST_KASAN_MODULE in the generic 5.10 config. Fixes build failures with KERNEL_KASAN enabled. Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be> Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
* build: fix various typosJosh Soref2021-10-311-1/+1
| | | | | | | | Fix typos in comment and user-facing help text. Signed-off-by: Josh Soref <jsoref@users.noreply.github.com> [split out config changes, adjust commit message] Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
* build: Replace KERNEL_LOCKUP_DETECTOR with KERNEL_SOFTLOCKUP_DETECTORHauke Mehrtens2021-09-131-16/+4
| | | | | | | | | | | | | The LOCKUP_DETECTOR configuration option split into the SOFTLOCKUP_DETECTOR and HARDLOCKUP_DETECTOR configuration option some time ago. The HARDLOCKUP_DETECTOR option is only working on some architectures, but SOFTLOCKUP_DETECTOR should work everywhere. Replace KERNEL_LOCKUP_DETECTOR with KERNEL_SOFTLOCKUP_DETECTOR. LOCKUP_DETECTOR will be selected by SOFTLOCKUP_DETECTOR automatically. Fixes: b951f53fbae3 ("build: Add additional kernel debug options") Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
* build: use SPDX license tagsPaul Spooren2021-02-051-4/+2
| | | | | | | | | The license folder is a core part of OpenWrt and all GPL-2.0 licensed. Use SPDX license tags to allow machines to check licenses. Signed-off-by: Paul Spooren <mail@aparcar.org> [rebase, keep some Copyright lines, sharpen commit message] Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
* kernel: add defaults for new SELinux optionsDaniel Golle2021-02-051-0/+10
| | | | Signed-off-by: Daniel Golle <daniel@makrotopia.org>
* config: drop CONFIG_KPROBE_EVENT unused since kernel 4.9Tony Ambardar2021-01-251-4/+0
| | | | | | | The config setting was renamed to CONFIG_KPROBE_EVENTS. Fixes: 97d3f800a8 ("config: kernel: Add KPROBE_EVENTS config option) Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
* kernel: make lwtunnel support optionalRui Salvaterra2021-01-141-2/+3
| | | | | | | | | | Not everyone will want to bloat their kernel by 24 kiB for such a niche feature. Fixes: a1a7f3274e0ed27511d45f62ee20281d8d57c7af "kernel: enable SRv6 support by enabling lwtunnel" Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
* kernel: drop unneeded kernel version dependencyAndy Walsh2021-01-141-1/+0
| | | | | | | | | | | The current master only supports kernel 5.4, and there is no reason to remove KERNEL_IO_URING for future kernels. Drop the unneeded dependency. Signed-off-by: Andy Walsh <andy.walsh44+github@gmail.com> [improve commit title/message] Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
* kernel: enable SRv6 support by enabling lwtunnelNick Hainke2021-01-111-0/+8
| | | | | | | | | | | | | | | | | | | | | | | | Enable the ability to use segment routing based on IPv6. It allows the packet to specify a path that the packet should take through the network. Lwtunnel allow an easy encapsulation of a package. You can just install ip-full package and use it: ip -6 route add 2003::/64 dev eth0 encap seg6 mode encap \ segs 2001::1,2002::2 An IPv6 package looks like this: [IPv6 HDR][IPv6 RH][IPv6 HDR][Data...] Netifd support: https://git.openwrt.org/?p=project/netifd.git; a=commit;h=458b1a7e9473c150a40cae5d8be174f4bb03bd39 Increases imagesize by 24.125 KiB. Therefore, only enable for devices with enough flash. Signed-off-by: Nick Hainke <vincent@systemli.org>
* kernel: only strip proc for small flash devicesNick Hainke2020-12-221-1/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, you are not able to get statistics about IPv4 and IPv6 usage. This information can be collected via the snmp and snmp6. However, in the current state this interface is disabled as you can read in the "902-debloat_proc.patch": "Strip non-essential /proc functionality to reduce code size" Tools like netstat use the snmp/6 interface to collect interface statistics. Some prometheus exporters also mention this: - prometheus-collectors/netstat.lua - prometheus-collectors/snmp6 (still a PR) - collectd/snmp6 (still a PR) PRs: - https://github.com/collectd/collectd/pull/3789 - https://github.com/openwrt/packages/pull/14158 Instead of enabling it as default for all devices we condition it default y if SMALL_FLASH A test shows it needs around 16 kiB. Signed-off-by: Nick Hainke <vincent@systemli.org> [fixed whitespace issue] Signed-off-by: Petr Štetiar <ynezz@true.cz>
* kernel: add KERNEL_IO_URING optionAndy Walsh2020-12-221-0/+5
| | | | | | | | | | | | | | | | | | | | | | * add KERNEL_IO_URING option NOTES: Adds configurable support for the io_uring interface (CONFIG_IO_URING) via KERNEL_IO_URING option. The kernel only zImage grows by about 5-9KB ? I would like to enable this by default for all 5.4 kernels, so i can use the new io_uring samba-4.12.x vfs module by default. The associated liburing was already submitted and merged. The kernel + liburing was tested on ARM/mvebu via samba4 vfs_io_uring module and i have no issues so far. Some extra reads on it and why we should enable it by default, since i expect more packages to use this in the future. https://wiki.samba.org/index.php/Samba_4.12_Features_added/changed#.27io_uring.27_vfs_module https://lwn.net/Articles/810414/ https://kernel.dk/io_uring.pdf https://www.phoronix.com/scan.php?page=news_item&px=Linux-5.6-IO-uring-Tests Signed-off-by: Andy Walsh <andy.walsh44+github@gmail.com>
* build: Add IRQSOFF and PREEMPT TRACER kernel config optionHauke Mehrtens2020-12-161-0/+34
| | | | | | | | | | | | | This adds the CONFIG_IRQSOFF_TRACER and the CONFIG_PREEMPT_TRACER kernel configuration option to the OpenWrt menu. This can be used to debug latencies in the system. The CONFIG_PREEMPT_TRACER option needs the CONFIG_PREEMPT option which is supposed to be used for Low-Latency Desktop and not used by many targets in OpenWrt. The help text is copied from the Linux kernel Kconfig. Signed-off-by: Hauke Mehrtens <hmehrtens@maxlinear.com>
* kernel: enable kernel keyring by default on !SMALL_FLASHDaniel Golle2020-12-141-1/+1
| | | | | | | | | | | | | Enable CONFIG_KEYS by default on systems which are not marked as flash-space constraint by the 'small_flash' feature. CONFIG_KEYS is required by Docker, enabling it in our kernel allows users to run Docker on stock OpenWrt. It is also used of by some network file systems (such as NFSv4) to store credentials as well as UID/GID mappings. Adds about 50kB to vmlinux on ath79/generic (~18kB compressed) Signed-off-by: Daniel Golle <daniel@makrotopia.org>
* kernel: update and clean kernel keyring optionsDaniel Golle2020-12-141-13/+13
| | | | | | | | | | Add KERNEL_KEYS_REQUEST_CACHE option. 'tristate' (ie. module builds) are not valid in Config-kernel.in, hence remove tristate KERNEL_ENCRYPTED_KEYS. It will be readded as a kernel module in a follow-up commit. Fixes: 39d817cf38 ("Add config symbols for kernel keyring support") Signed-off-by: Daniel Golle <daniel@makrotopia.org>
* kernel: Activate KERNEL_MIPS_FP_SUPPORT for pistachio targetHauke Mehrtens2020-11-011-0/+1
| | | | | | | | | The pistachio target uses a MIPS CPU with FPU and OpenWrt uses a toolchain with hard FPU support. MIPS FPU support needs the FPU emulation code in the kernel. Fixes: ac5671f46cb4 ("kernel: remove obsolete kernel version switches for 4.19") Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
* kernel: remove obsolete kernel version switches for 4.19Adrian Schmutzler2020-10-301-7/+0
| | | | | | | This removes switches dependent on kernel version 4.19 as well as several packages/modules selected only for that version. Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
* config: clean up SELinux optionsDaniel Golle2020-10-161-0/+2
| | | | | | | | | In order to make it easier for users to build with SELinux, have a single option in 'Global build settings' to enable all necessary kernel features, userland packages and build-system hooks. Also add better descriptions and help messages while at it. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
* config: add KERNEL_LSM symbolPaul Spooren2020-09-031-11/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | The LSM (Linux security mechanism) list is the successor of the now legacy *major LSM*. Instead of defining a single security mechanism the LSM symbol is a comma separated list of mechanisms to load. Until recently OpenWrt would only support DAC (Unix discretionary access controls) which don't require an additional entry in the LSM list. With the newly introduced SELinux support the LSM needs to be extended else only a manual modified Kernel cmdline (`security=selinux`) would activate SELinux. As the default OpenWrt Kernel config sets DAC as default security mechanism, SELinux is stripped from the LSM list, even if `KERNEL_DEFAULT_SECURITY_SELINUX` is activated. To allow SELinux without a modified cmdline this commit sets a specific LSM list if `KERNEL_SECURITY_SELINUX` is enabled. The upstream Kconfig adds even more mechanisms (smack,selinux,tomoyo,apparmor), but until they're ported to OpenWrt, these can be ignored. To compile SELinux Kernel support but disable it from loading, the already present options `KERNEL_SECURITY_SELINUX_DISABLE` or `KERNEL_SECURITY_SELINUX_BOOTPARAM` (with custom cmdline `selinux=0`) can be used. Further it's possible to edit `/etc/selinux/config`. Signed-off-by: Paul Spooren <mail@aparcar.org>
* kernel: remove obsolete kernel version switches for 4.14Adrian Schmutzler2020-09-021-1/+1
| | | | | | | | | | This removes switches dependent on kernel version 4.14 as well as several packages/modules selected only for that version. This also removes sched-cake-virtual, which is not required anymore now that we have only one variant of cake. Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
* kernel: add options needed for SELinuxThomas Petazzoni2020-08-311-0/+55
| | | | | | | | | | This adds a number of options to config/Config-kernel.in so that packages related to SELinux support can enable the appropriate Linux kernel support. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> [rebase; add ext4, F2FS, UBIFS, and JFFS2 support; add commit message] Signed-off-by: W. Michael Petullo <mike@flyn.org>
* config: kernel: fix missed CGROUP_HUGETLB symbolYuan Tao2020-08-241-2/+2
| | | | | | | The symbol KERNEL_CGROUP_HUGETLB is always used whenever KERNEL_CGROUPS is enabled. The absence of this notation will cause the user to be asked to enter this parameter the first time it is compiled. Signed-off-by: Yuan Tao <ty@wevs.org>
* kernel: further clean-up options and defaultsDaniel Golle2020-08-101-11/+11
| | | | | | | | | | | | Remove `if !SMALL_FLASH` in places which are anyway already augmented by `if !SMALL_FLASH`. Always enable CONFIG_BLK_DEV_THROTTLING on !SMALL_FLASH devices rather than just enabling it on bcm27xx. Enabled CPU bandwidth provisioning for FAIR_GROUP_SCHED on !SMALL_FLASH devices as CONFIG_FAIR_GROUP_SCHED is already enabled and becomes more useful for cgroups with that option enbled as well. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
* kernel: fix missing TRANSPARENT_HUGEPAGE symbolsStijn Tintel2020-08-011-0/+12
| | | | | | | | | | | | | | | | Enabling KERNEL_TRANSPARENT_HUGEPAGE exposes 2 missing symbols: * CONFIG_READ_ONLY_THP_FOR_FS * TRANSPARENT_HUGEPAGE_ALWAYS * TRANSPARENT_HUGEPAGE_MADVISE The first one was added in 5.4, and is marked experimental there so just disable it in the generic config. For the latter two, we should not force the user to use either of them, so add them as build-configurable kernel options. Fixes: d1a8217d87bf ("kernel: clean-up build-configurable kernel config symbols") Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
* kernel: add menuconfig entry for kernel CONFIG_CGROUP_NET_CLASSIDDaniel Golle2020-07-311-0/+4
| | | | | | | | It was removed from target defaults though it didn't exist in the build-systems kernel configuration options. Add it there. Fixes: d1a8217d87 ("kernel: clean-up build-configurable kernel config symbols") Signed-off-by: Daniel Golle <daniel@makrotopia.org>
* kernel: clean-up build-configurable kernel config symbolsDaniel Golle2020-07-301-10/+39
| | | | | | | | | Don't explicitely disable options in target/linux/generic/config-* if they are already controlled in config/Config-kernel.in. Add a bunch of new symbols and prepare defaults for using only unified hierarchy (ie. cgroup2). Update symbol dependencies while at it Signed-off-by: Daniel Golle <daniel@makrotopia.org>
* kernel: rename CONFIG_NETPRIO_CGROUP to CONFIG_CGROUP_NET_PRIOJavier Marcet2020-06-271-1/+1
| | | | | | This has been changed in kernel 3.14. Signed-off-by: Javier Marcet <javier@marcet.info>
* x86: make crashdump worksChen Minqiang2020-03-201-0/+4
| | | | | | | | | | | | | | | 1. KERNEL_CRASH_DUMP should depends on KERNEL_PROC_KCORE (kexec use it) 2. select crashkernel mem size by totalmem mem <= 256M disable crashkernel by default mem >= 4G use 256M for crashkernel mem >= 8G use 512M for crashkernel default use 128M 3. set BOOT_IMAGE in kdump.init 4. resolve a "Unhandled rela relocation: R_X86_64_PLT32" error Tested on x86_64 Signed-off-by: Chen Minqiang <ptpt52@gmail.com>
* kernel: Use new symbol to deactivate MIPS FPU supportHauke Mehrtens2020-02-281-0/+5
| | | | | | | | | | | With kernel 5.4 the upstream kernel supports deactivating the FPU support on MIPS. Use this new upstream feature instead of our older patch which was removed when porting the kernel patches to kernel 5.4. This way both options are set which should work for older kernel versions and also new ones. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
* build: Add additional kernel debug optionsHauke Mehrtens2020-02-221-0/+68
| | | | | | | | Make it possible to activate some additional kernel debug options. This can be used to debug some problems in kernel drivers. Signed-off-by: Hauke Mehrtens <hauke.mehrtens@intel.com> Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com>
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