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| author |   Vasily Gorbik <gor@linux.ibm.com> | 2021-10-14 13:33:45 +0200 |
|---|---|---|
| committer |   Heiko Carstens <hca@linux.ibm.com> | 2021-11-16 12:29:18 +0100 |
| commit | 420f48f636b98fd685f44a3acc4c0a7c0840910d (patch) | |
| tree | 5b13b982feda84cc8ff77445576f380c97c95f76 /arch/s390 | |
| parent | Linux 5.16-rc1 (diff) | |
| download | linux-dev-420f48f636b98fd685f44a3acc4c0a7c0840910d.tar.xz linux-dev-420f48f636b98fd685f44a3acc4c0a7c0840910d.zip | |
s390/setup: avoid reserving memory above identity mapping
Such reserved memory region, if not cleaned up later causes problems when
memblock_free_all() is called to release free pages to the buddy allocator
and those reserved regions are carried over to reserve_bootmem_region()
which marks the pages as PageReserved.
Instead use memblock_set_current_limit() to make sure memblock allocations
do not go over identity mapping (which could happen when "mem=" option
is used or during kdump).
Cc: stable@vger.kernel.org
Fixes: 73045a08cf55 ("s390: unify identity mapping limits handling")
Reported-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kernel/setup.c | 10 |
1 files changed, 1 insertions, 9 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 40405f2304f1..30aba0f21e85 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -638,14 +638,6 @@ static struct notifier_block kdump_mem_nb = { #endif /* - * Make sure that the area above identity mapping is protected - */ -static void __init reserve_above_ident_map(void) -{ - memblock_reserve(ident_map_size, ULONG_MAX); -} - -/* * Reserve memory for kdump kernel to be loaded with kexec */ static void __init reserve_crashkernel(void) @@ -999,11 +991,11 @@ void __init setup_arch(char **cmdline_p) setup_control_program_code(); /* Do some memory reservations *before* memory is added to memblock */ - reserve_above_ident_map(); reserve_kernel(); reserve_initrd(); reserve_certificate_list(); reserve_mem_detect_info(); + memblock_set_current_limit(ident_map_size); memblock_allow_resize(); /* Get information about *all* installed memory */ |