On Sat 2020-05-16 11:55:04, Orson Zhai wrote: > On Fri, May 15, 2020 at 5:55 PM Petr Mladek <pmladek@xxxxxxxx> wrote: > > > > On Thu 2020-04-23 00:02:48, Orson Zhai wrote: > > > On Wed, Apr 22, 2020 at 10:25 PM Leon Romanovsky <leon@xxxxxxxxxx> wrote: > > > > > > > > On Wed, Apr 22, 2020 at 09:06:08PM +0800, Orson Zhai wrote: > > > > > On Tue, Apr 21, 2020 at 3:10 AM Leon Romanovsky <leon@xxxxxxxxxx> wrote: > > > > > My motivation came from the concept of GKI (Generic Kernel Image) in Android. > > > > > Google will release a common kernel image (binary) to all of the Android system > > > > > vendors in the world instead of letting them to build their owns as before. > > > > > Every SoC vendor's device drivers will be provided in kernel modules only. > > > > > By my patch, the driver owners could debug their modules in field (say > > > > > production releases) > > > > > without having to enable dynamic debug for the whole GKI. > > > > > > > > Will Google release that binary with CONFIG_DYNAMIC_DEBUG_CORE disabled? > > > > > > > In Google's plan, there will be only one GKI (no debug version) for > > > one Android version per kernel version per year. > > > > Are there plans to use modules with debug messages enabled on production > > systems? > > Yes, but in a managed way. They are not being enabled directly to log buffer. > Users / FAEs (Field Application Engineer) might control to open or > close every single one on-the-fly. I see. > > IMHO, the debug messages are primary needed during development and > > when fixing bugs. I am sure that developers will want to enable many > > more features that will help with debugging and which will be disabled > > on production systems. > > I agree with you in general speaking. > For real production build we usually keep a few critical debugging > methods in case of some > potential bugs which are extremely hard to be found in production test. > Dynamic debug is one of these methods. > I assume it is widely used for maintenance to PC or server because I > can find it is enabled in some > popular Linux distribution configs. Fair enough. Feel free to add: Acked-by: Petr Mladek <pmladek@xxxxxxxx> Best Regards, Petr
