From cb22cd2d8ff3201f04f167efa86cc561dccffffe Mon Sep 17 00:00:00 2001 From: Alexander Egorenkov Date: Thu, 11 Nov 2021 12:33:59 +0100 Subject: [PATCH] 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 Reviewed-by: Alexander Gordeev Signed-off-by: Alexander Egorenkov [agordeev@linux.ibm.com: added debug output] Signed-off-by: Alexander Gordeev Signed-off-by: Heiko Carstens --- arch/s390/mm/init.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 8c6f258a6183..86ffd0d51fd5 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -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); }