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

[Rosen Penev]

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.
>
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