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s390: clarify compressed image code path

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The way the decompressor is hooked into the start-up code is rather
subtle, with a mix of multiply-defined symbols and hardcoded address
literals. Add some comments at the junction points to clarify how it
works.

Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sascha Silbe
2016-07-04 17:16:47 +02:00
committed by Martin Schwidefsky
parent 29b4817d40
commit bf47dc572a
2 changed files with 11 additions and 4 deletions
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4
arch/s390/kernel/head.S
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@@ -309,7 +309,9 @@ ENTRY(startup_kdump)
l %r15,.Lstack-.LPG0(%r13)
ahi %r15,-STACK_FRAME_OVERHEAD
brasl %r14,verify_facilities
/* Continue with startup code in head64.S */
# For uncompressed images, continue in
# arch/s390/kernel/head64.S. For compressed images, continue in
# arch/s390/boot/compressed/head.S.
jg startup_continue
.Lstack: