[OpenWrt-Devel] Cleanup in 4.19 generic kernel config?

[Rosen Penev]

On Wed, Feb 13, 2019 at 4:01 AM Daniel Engberg
<daniel.engberg.lists at pyret.net> wrote:
>
> On 2019-02-13 00:08, Rosen Penev wrote:
> > On Sat, Feb 9, 2019 at 12:16 AM Daniel Engberg
> > <daniel.engberg.lists at pyret.net> wrote:
> >>
> >> Hi,
> >>
> >> After my attempt getting Linux 4.19 working for the Octeon target
> >> I started to look at the generic configuration for 4.19 and it
> >> seems that there are quite a bit of target specific options listed
> >> and potentially generating larger kernels than necessary.
> >> Given that some options are incorrect for certain targets I assume
> >> that they get overridden and/or ignored. Unless I misunderstand
> >> how the Linux kernel configuration works =y is equivalent to always
> >> compiled into kernel?
> >>
> >> I'm taking about this file by the way:
> >> https://github.com/openwrt/openwrt/blob/master/target/linux/generic/config-4.19
> >>
> >> Should be set by target? Shouldn't coexist with CONFIG_64BIT as
> >> far as I can tell.
> >> CONFIG_32BIT=y
> >>
> >> ARM specific, should be set by target?
> >> CONFIG_ARM_CPU_TOPOLOGY=y
> >> CONFIG_ARM_DMA_MEM_BUFFERABLE=y
> >> CONFIG_ARM_GIC_MAX_NR=1
> >>
> >> Target specific, no need to have it enabled by default and/or
> >> possibly at all?
> >> CONFIG_ATA_BMDMA=y
> >> CONFIG_ATA_SFF=y
> >>
> >> Seems to be defined by default?
> >> CONFIG_BLK_DEV_LOOP_MIN_COUNT=8
> >> https://github.com/torvalds/linux/blob/master/drivers/block/Kconfig#L217
> >>
> >> Should be set by target?
> >> CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT=3
> >>
> >> Debug option - Adds unnecessary overhead?
> >> CONFIG_BRANCH_PROFILE_NONE=y
> >> https://cateee.net/lkddb/web-lkddb/BRANCH_PROFILE_NONE.html
> >>
> >> Should be set by target (ARM)?
> >> CONFIG_CACHE_L2X0_PMU=y
> >>
> >> Should be set by target, why is it enabled in 2019?
> >> CONFIG_CARDBUS=y
> >>
> >> Should be set by target (seems x86/64x specific)?
> >> CONFIG_DOUBLEFAULT=y
> >>
> >> Gets defined automatically based on target/platform?
> >> CONFIG_HZ=100
> >> CONFIG_HZ_100=y
> >>
> >> Already default?
> >> CONFIG_IIO_CONSUMERS_PER_TRIGGER=2
> >> https://cateee.net/lkddb/web-lkddb/IIO_CONSUMERS_PER_TRIGGER.html
> >>
> >> Why?
> >> CONFIG_ISDN=y
> >> CONFIG_JOLIET=y
> >>
> >> Should be set by target (ARM)?
> >> CONFIG_KERNEL_MODE_NEON=y
> >>
> >> Set Page_Size by target?
> >> CONFIG_PAGE_SIZE_4KB=y
> >> CONFIG_PPC_4K_PAGES=y
> >>
> >> Already default?
> >> CONFIG_PWRSEQ_EMMC=y
> >> https://cateee.net/lkddb/web-lkddb/PWRSEQ_EMMC.html
> >>
> >> Default 21 isn't enough?
> >> CONFIG_RCU_CPU_STALL_TIMEOUT=60
> >>
> >> Needed for?
> >> CONFIG_RXKAD=y
> >>
> >> Obsolete?
> >> CONFIG_SLABINFO=y
> >>
> >> Shouldn't be default and/or platform specific?
> >> CONFIG_SND_X86=y
> >>
> >> Needed for?
> >> CONFIG_USB_ARMLINUX=y
> >> CONFIG_USB_BELKIN=y
> >>
> >> Platform specific?
> >> CONFIG_USB_OHCI_LITTLE_ENDIAN=y
> >>
> >> Platform specific?
> >> CONFIG_X86_SYSFB=y
> >>
> >> Best regads,
> >> Daniel
> > I've been running this with ramips for a few days. No issues to report.
> >>
> >> _______________________________________________
> >> openwrt-devel mailing list
> >> openwrt-devel at lists.openwrt.org
> >> https://lists.openwrt.org/mailman/listinfo/openwrt-devel
>
> Hi,
>
> Thanks for giving it a try, hopefully someone we can make generic a
> little bit cleaner in the end. Since you tried it on ramips and going
> by this
> https://github.com/neheb/source/commit/500f88b54beb9399d1e4927fcd2d0fc59154dfe1
> I'm going to assume that you tried this on 4.14? :-)
Yes
>
> Best regards,
> Daniel

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