search

raspberrypi / linux

Kernel source tree for Raspberry Pi-provided kernel builds. Issues unrelated to the linux kernel should be posted on the community forum at https://forums.raspberrypi.com/
Other
11.02k stars 4.95k forks source link

RT patch for stable releases #2244

Closed az2022 closed 6 years ago

az2022 commented 6 years ago

With the app I work on, one of the requirement is to use Raspbian kernel with real-time patch applied. It has become an issue of finding a match to what kernel version is released by raspberry-pi org and which kernel version patch is released by kernel.org (https://www.kernel.org/pub/linux/kernel/projects/rt/). Lot of times they don't match, for e.g. I got the latest Raspbian (Stretch) which hosts kernel v4.9.41 while the real time patch is available for 4.9.40 and 4.9.47. I checked-out Raspbian source commit available right after 4.9.47 was committed to the source tree, applied RT patch and built. Everything went well and Pi3 boots fine, but sometimes hangs when apps (for e.g. gitk) are started or midway of a gcc build. Understandably Raspbian was not released with 4.9.47 but I had to try! Bottom line, it would be nice to have a RT patch available for the released/stable Rapbian images, unless there's a way around this? :)

TiejunChina commented 6 years ago

@FischC Could you try the latest rpi-4.14.y-rt? If you still can reproduce that problem, please ping me again. But just sorry, I will probably not respond that timely because I will have a business travel this week.

FischC commented 6 years ago

@TiejunChina I've tested with Linux "raspberrypi 4.14.66-rt40-v7+ #6 SMP PREEMPT RT Tue Aug 28 13:54:36 CEST 2018 armv7l GNU/Linux" and I can still reproduce the problem. Shall I create a new ticket?

TiejunChina commented 6 years ago

@FischC Please, go ahead.

TiejunChina commented 6 years ago

I'd like to close this issue since we have had our -rt branch for a while.