s390/mm: Convert bootmem to memblock

The original bootmem allocator is getting replaced by memblock. To
cover the needs of the s390 kdump implementation the physical memory
list is used.
With this patch the bootmem allocator and its bitmaps are completely
removed from s390.

Signed-off-by: Philipp Hachtmann <phacht@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index a734f3585ceb..0dff972a169c 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -258,13 +258,19 @@ static __init void setup_topology(void)
 static void early_pgm_check_handler(void)
 {
         const struct exception_table_entry *fixup;
+        unsigned long cr0, cr0_new;
         unsigned long addr;
 
         addr = S390_lowcore.program_old_psw.addr;
         fixup = search_exception_tables(addr & PSW_ADDR_INSN);
         if (!fixup)
                 disabled_wait(0);
+        /* Disable low address protection before storing into lowcore. */
+        __ctl_store(cr0, 0, 0);
+        cr0_new = cr0 & ~(1UL << 28);
+        __ctl_load(cr0_new, 0, 0);
         S390_lowcore.program_old_psw.addr = extable_fixup(fixup)|PSW_ADDR_AMODE;
+        __ctl_load(cr0, 0, 0);
 }
 
 static noinline __init void setup_lowcore_early(void)