s390/setup: don't reserve memory that occupied decompressor's head

There is no useful information within [STARTUP_NORMAL_OFFSET, HEAD_END] now.

But the memory region [0, STARTUP_NORMAL_OFFSET] is used by:
* lowcore
* kdump for swapping memory
* stand-alone zipl dumpers for code, data, stack and heap

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 32d1324723f2f6dd176d9b9d75b967109f3fd65b..c5bbf968669e08ffd9e65ee77e3bc798a69844cb 100644 (file)
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -797,7 +797,7 @@ static void __init reserve_kernel(void)
 {
        unsigned long start_pfn = PFN_UP(__pa(_end));
 
-       memblock_reserve(0, HEAD_END);
+       memblock_reserve(0, STARTUP_NORMAL_OFFSET);
        memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
                         - (unsigned long)_stext);
 }