[5.10] pstore: features for debug kdump · Pull Request !3 · XiangZao/cloud-kernel

**Feature 1 - add multibackends support** 
Currently, pstore supports only one backend enabled at a time. However, if a new backend wants to register later, pstore will simply reject it and return an error. This design forced us to close existing backend in order to use the new ones.

The kernel supports some types of backend, such as ramoops and blk. In practice, we can also implement multiple types of backend. Different backends collect information based on different scenarios or services. Therefore, they need to work at the same time to meet various requirements.

The most important is to replace the global variable psinfo with an array. Different backends can reuse the same front end (if they both enable that front end at the same time) to avoid excess overhead.

Some additional changes have also been made to show the records of different backends better. In addition, parameter "backend" lost its original functions due to logic changes. Therefore, "backend" is removed as an unnecessary parameter.

**Feature 2 - add ttyprobe frontend** 
Provide a pstore frontend which can log all messages that are send to tty drivers when there are some problems with drivers or there is no access to serial ports.

类型	指派人员	状态
审查		已完成 (1/1)
测试		已完成 (1/1)

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