src: relace springboard & stack-pivot & stack protector with herd

[ampresent]

This feature is inspired by RCU grace period. It wakes up sleeping tasks without modifying their state, and mark them as need resched at the same time. This forces them doing at least one round of context switches.

while (need_resched()) { ___schedule context_switch }

By the next time it calls schedule, schedule is already restored to __orig___schedule.

With herd, we don't need to divide __schedule into two halves anymore, which means balance_fallback & finish_task_switch are part of the mod automatically.

And because springboard & stack-pivot & stack protector is not needed anymore, lots of code is saved.

Signed-off-by: Yihao Wu wuyihao@linux.alibaba.com

[anolis-bot]

@ampresent , a new test job has been submitted. Please wait in patience. The test job url: https://tone.openanolis.cn/ws/2r1b4c7z/test_result/41412

[anolis-bot]

@ampresent , The CI test is completed, please check result:

Test Case		Test Result
schedule_test	x86_64	:x: FAIL
schedule_test	aarch64	:x: FAIL

Sorry, your test job failed. Please get the details in the link.

[ampresent]

/retest

[anolis-bot]

@ampresent , the test job has been submitted. Please wait in patience. The test job url: https://tone.openanolis.cn/ws/2r1b4c7z/test_result/41420

[anolis-bot]

@ampresent , The CI test is completed, please check result:

Test Case		Test Result
schedule_test	x86_64	:x: FAIL
schedule_test	aarch64	:x: FAIL

Sorry, your test job failed. Please get the details in the link.

[anolis-bot]

@ampresent , the code has been updated, so a new test job has been submitted. Please wait in patience. The test job url: https://tone.openanolis.cn/ws/2r1b4c7z/test_result/41712

[anolis-bot]

@ampresent , the code has been updated, so a new test job has been submitted. Please wait in patience. The test job url: https://tone.openanolis.cn/ws/2r1b4c7z/test_result/41715

[anolis-bot]

@ampresent , The CI test is completed, please check result:

Test Case		Test Result
schedule_test		:no_entry_sign: CREATE TASK ERROR
schedule_test	aarch64	:x: FAIL

Sorry, your test job failed. Please get the details in the link.

[anolis-bot]

@ampresent , The CI test is completed, please check result:

Test Case		Test Result
schedule_test	x86_64	:x: FAIL
schedule_test	aarch64	:x: FAIL

Sorry, your test job failed. Please get the details in the link.

[ampresent]

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