Launchpad Entry: hardware-p-kernel-config-review
Review of the kernel configuration for Precise Pangolin 12.04. This will concentrate on confirming the policy for various option type, as well as new options. For major new options, discussion and confirmation of the selection of each.
The review in this Spec
We need to review the PP kernel config to:
- Ensure sanity of options we have enabled/disabled
- Ensure that we have the best possible coverage for hardware
- Ensure we maintain our security options
We need to review the default selection criteria for new options. We need to review any new options to ensure they are sensibly set. Finally we need to review important options such as filesystem selections and security options to ensure they are set as expected.
The basic rules are:
- if the option may be selected as module then we will enable it as a module,
- if the option creates a new subsystem (or filesystem) we will enable it,
- if the option is unlikely to cause regressions to existing behaviour we will enable it,
- if the option is dependent on EXPERIMENTAL then our normal policy is to not enable it, however it it is device specific we will enable it even though EXPERIMENTAL,
- else it will be disabled.
Additionally we have general policy of building in:
- subsystems associated with busses (as they will probe much earlier that way)
- boot essential subsystems
- default filesystems
- extremely common drivers
- usbhost interface drivers as they have huge ordering requirements
- cpufreq because it's hard to do in userspace
- non-discoverable drivers
BoF agenda and discussion
Welcome to Ubuntu Developer Summit! #uds-p #track #topic put your session notes here UUID support in the kernel may mean we need to add more boot essential devices ECRYPT_FS -- ensure this is in the enforcer - Something breaks if ECRYPT is compiled as module? EXT2 can move =m FAT_FS should be enforced =y for ARM as they need it for boot partition PROC_FS is not an _FS remove it LLC shoulde be possible to move it =y for ARM CONFIG_PACKET is ok as it is ATA_NONSTANDARD needs investigation PATA_OPTI needs investigation PATA_TOSHIBA needs investigation SENSORS_AK8975 NI SENSORS_LINEAGE NI SENSORS_LM95245 NI SENSORS_MAX* NI SENSORS_NTC_THERMISTOR ACPI_ASUS NI CUSTOM_METHOD is right to be off and should be enforced and have a policy listed CONFIG_BLK look to be boot essential, add annotations *_PHY NI do we need this, if so then it needs annotation as boot essential -- possibily registration race CRYPTO_* is again a registration race NON PAE kernel do we need it (WRONG SESSION) are all intel and amd supporting PAE now for supported kernels DM_DELAY/_FLAKY is debugging support DM_RAID45 correctly inconsistent EFI_VARS needs an annotation, DI requirement FDDI annotation for protocol builtin IDE is deprecated, needs annotation ISI NI KVM NI builtin on power NLS_COEPAGE_437 builtin on arm because of FAT, annotate POHMELFS -- NI on power USB_SERIAL* why turned off on arm/power ARM_PATCH_PHYS_VIRT ok needs annotation GPIO_CS5535 =m check for i386-generic MMC_SDHCI NI XEN_BLKFRONT NETFRONT =y for all "anything you might run in xen" KVM_VIRTIO (??) equivalent drivers same thing /procfs interfaces for ACPI battery etc are deprecated, see what breaks DYNAMIC_DEBUG consider enabling this ... costs performance, size NETFILTER loaded may have a measurable cost, needs investigating, OEM to investigate