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s390/sclp: release SCLP early buffer after kernel initialization 

The SCLP early buffer is used only during kernel initialization and can be
freed afterwards. The only way to ensure that it is not released while
being in use, is to release it in free_initmem().

Acked-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
[agordeev@linux.ibm.com: added debug output]
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Alexander Egorenkov 2021-11-11 12:33:59 +01:00 committed by Heiko Carstens
parent c7ed509b21
commit cb22cd2d8f
1 changed files with 3 additions and 0 deletions
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3
arch/s390/mm/init.c
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@ -215,6 +215,9 @@ void free_initmem(void)
__set_memory((unsigned long)_sinittext,
(unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
SET_MEMORY_RW | SET_MEMORY_NX);
free_reserved_area(sclp_early_sccb,
sclp_early_sccb + EXT_SCCB_READ_SCP,
POISON_FREE_INITMEM, "unused early sccb");
free_initmem_default(POISON_FREE_INITMEM);
}