[S390] nss: Free unused memory in kernel image.

With CONFIG_SHARED_KERNEL the kernel text segment that might be in a
read only memory sections starts at 1MB. Memory between 0x12000 and
0x100000 is unused then. Free this, so we have appr. an extra MB
of memory available.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index fced022dc58d..863c8d08c026 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -690,9 +690,14 @@ setup_memory(void)
         psw_set_key(PAGE_DEFAULT_KEY);
 
         free_bootmem_with_active_regions(0, max_pfn);
-        reserve_bootmem(0, PFN_PHYS(start_pfn));
 
         /*
+         * Reserve memory used for lowcore/command line/kernel image.
+         */
+        reserve_bootmem(0, (unsigned long)_ehead);
+        reserve_bootmem((unsigned long)_stext,
+                        PFN_PHYS(start_pfn) - (unsigned long)_stext);
+        /*
          * Reserve the bootmem bitmap itself as well. We do this in two
          * steps (first step was init_bootmem()) because this catches
          * the (very unlikely) case of us accidentally initializing the