s390/entry: workaround llvm's IAS limitations

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llvm's integrated assembler cannot handle immediate values which are
calculated with two local labels:

<instantiation>:3:13: error: invalid operand for instruction
 clgfi %r14,.Lsie_done - .Lsie_gmap

Workaround this by adding clang specific code which reads the specific
value from memory. Since this code is within the hot paths of the kernel
and adds an additional memory reference, keep the original code, and add
ifdef'ed code.

Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Link: https://lore.kernel.org/r/20220511120532.2228616-5-hca@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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Heiko Carstens 2022-05-11 14:05:27 +02:00

parent e6ed91fd07

commit 4c25f0ff63

1 changed files with 12 additions and 2 deletions

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arch/s390/kernel/entry.S

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