Commit 6b4b54c7 authored by Alexander Egorenkov's avatar Alexander Egorenkov Committed by Vasily Gorbik
Browse files

s390/setup: preserve memory at OLDMEM_BASE and OLDMEM_SIZE 



We need to preserve the values at OLDMEM_BASE and OLDMEM_SIZE which are
used by zgetdump in case when kdump crashes. In that case zgetdump will
attempt to read OLDMEM_BASE and OLDMEM_SIZE in order to find out where
the memory range [0 - OLDMEM_SIZE] belonging to the production kernel is.

Fixes: f1a54694 ("s390/setup: don't reserve memory that occupied decompressor's head")
Cc: stable@vger.kernel.org # 5.15+
Signed-off-by: default avatarAlexander Egorenkov <egorenar@linux.ibm.com>
Acked-by: default avatarVasily Gorbik <gor@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent dd9cb842

arch/s390/kernel/setup.c

+2 −0
Original line number Diff line number Diff line
@@ -800,6 +800,8 @@ static void __init check_initrd(void) 
static void __init reserve_kernel(void)

{

	memblock_reserve(0, STARTUP_NORMAL_OFFSET);

	memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));

	memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));

	memblock_reserve(__amode31_base, __eamode31 - __samode31);

	memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);

	memblock_reserve(__pa(_stext), _end - _stext);