s390/udelay: make it work for the early code

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Currently udelay relies on working EXT interrupts handler, which is not
the case during early startup. In such cases udelay_simple() has to be
used instead.

To avoid mistakes of calling udelay too early, which could happen from
the common code as well - make udelay work for the early code by
introducing static branch and redirecting all udelay calls to
udelay_simple until EXT interrupts handler is fully initialized and
async stack is allocated.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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Vasily Gorbik 2020-10-13 22:35:27 +02:00 • committed by Heiko Carstens

parent 13b5bd8af4

commit 85cde0192a

3 changed files with 15 additions and 0 deletions

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1

arch/s390/include/asm/delay.h

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1

arch/s390/kernel/setup.c

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13

arch/s390/lib/delay.c

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