Linux

49051 readers

441 users here now

From Wikipedia, the free encyclopedia

Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

Rules

Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.
No misinformation
No NSFW content
No hate speech, bigotry, etc

Related Communities

Community icon by Alpár-Etele Méder, licensed under CC BY 3.0

founded 5 years ago

MODERATORS

AgreeableLandscape@lemmy.ml

nooter692@lemmy.ml

MarcellusDrum@lemmy.ml

cypherpunks@lemmy.ml

cyclohexane@lemmy.ml

d3Xt3r@lemmy.nz

I cannot enable HAVE_KPROBES_ON_FTRACE - Kernel compile (programming.dev)

submitted 1 month ago by SpongeB0B@programming.dev to c/linux@lemmy.ml

6 comments fedilink hide all child comments

Hi,

I have a great piece of software, that apparently need HAVE_KPROBES_ON_FTRACE

To config the kernel option I'm using :

make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- menuconfig

The Kernel is Linux/arm64 6.6.63

When I'm doing a search inside menuconfig i get:

Symbol: HAVE_KPROBES_ON_FTRACE [=n]
Type  : bool
Defined at arch/Kconfig:223


Symbol: KPROBES_ON_FTRACE [=n]
Type  : bool
Defined at arch/Kconfig:117
 Depends on: KPROBES [=y] && HAVE_KPROBES_ON_FTRACE [=n] && DYNAMIC_FTRACE_WITH_REGS [=n]

But I found it no where in the menu... and if I add it mannuly in the .config file, then make some more other adapations in menuconfig my manual entry disappear..

Any ideas ?

Maybe HAVE_KPROBES_ON_FTRACE is not supported in 6.6.63 ?

Thanks

top 6 comments

sorted by: hot top controversial new old

[–] SteveTech@programming.dev 2 points 1 month ago (1 children)

The options that start with HAVE_ usually depend on the arch or compiler. I don't believe it's possible to enable manually without modifying the source itself.

[–] SpongeB0B@programming.dev 1 points 1 week ago (1 children)

Thanks @SteveTech@programming.dev

I suppose the file linux/arch/Kconfig is the base the menuconfig to know which option is available ? right ?

Thanks.

[–] SteveTech@programming.dev 2 points 6 days ago

Yes, but it doesn't look like KPROBES_ON_FTRACE is supported on arm64. I did find this patch though which implements it: https://patchwork.kernel.org/project/linux-arm-kernel/patch/20191218140622.57bbaca5@xhacker.debian/

If you don't know how to apply a patch, you can either paste the link into b4, or download the mbox and apply it with git am.

[–] themoken@startrek.website 1 points 1 month ago (1 children)

It's possible that it's not supported on your arch.

[–] SpongeB0B@programming.dev 1 points 1 week ago (1 children)

Thanks, how can we verify this ?

[–] themoken@startrek.website 1 points 1 week ago

Basically just start with what you're aiming to enable and work backwards (as you've started to do). With judicious use of grep find out where that symbol is defined. If it's in arch configs for other arches but not your own, it's probably that.

There may be better tools out there to do this, but in my experience just sleuthing it out a bit will answer your question. The Kconfig system can be complex, but the files are pretty readable.