s390: remove critical section cleanup from entry.S
The current code is rather complex and caused a lot of subtle and hard to debug bugs in the past. Simplify the code by calling the system_call handler with interrupts disabled, save machine state, and re-enable them later. This requires significant changes to the machine check handling code as well. When the machine check interrupt arrived while being in kernel mode the new code will signal pending machine checks with a SIGP external call. When userspace was interrupted, the handler will switch to the kernel stack and directly execute s390_handle_mcck(). Signed-off-by:Sven Schnelle <svens@linux.ibm.com> Signed-off-by:
Vasily Gorbik <gor@linux.ibm.com>
parent
11886c19
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