s390/setup: avoid reserving memory above identity mapping

commit 420f48f636b98fd685f44a3acc4c0a7c0840910d upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 67e5fff..d77269f 100644 (file)
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -634,14 +634,6 @@ 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)
@@ -1005,11 +997,11 @@ 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 */