s390/mem_detect: remove artificial kdump memory types

Simplify the memory detection code a bit by removing the CHUNK_OLDMEM
and CHUNK_CRASHK memory types.
They are not needed. Everything that is needed is a mechanism to
insert holes into the detected memory.

Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 7 insertions, 21 deletions

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index cdd9ec0a6fc0..0a49095104c9 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -463,14 +463,10 @@ static void __init setup_resources(void)
         for (i = 0; i < MEMORY_CHUNKS; i++) {
                 if (!memory_chunk[i].size)
                         continue;
-                if (memory_chunk[i].type == CHUNK_OLDMEM ||
-                    memory_chunk[i].type == CHUNK_CRASHK)
-                        continue;
                 res = alloc_bootmem_low(sizeof(*res));
                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
                 switch (memory_chunk[i].type) {
                 case CHUNK_READ_WRITE:
-                case CHUNK_CRASHK:
                         res->name = "System RAM";
                         break;
                 case CHUNK_READ_ONLY:
@@ -527,7 +523,7 @@ static void __init setup_memory_end(void)
                 unsigned long align;
 
                 chunk = &memory_chunk[i];
-                if (chunk->type == CHUNK_OLDMEM)
+                if (!chunk->size)
                         continue;
                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
                 start = (chunk->addr + align - 1) & ~(align - 1);
@@ -579,7 +575,7 @@ static void __init setup_memory_end(void)
         for (i = 0; i < MEMORY_CHUNKS; i++) {
                 struct mem_chunk *chunk = &memory_chunk[i];
 
-                if (chunk->type == CHUNK_OLDMEM)
+                if (!chunk->size)
                         continue;
                 if (chunk->addr >= memory_end) {
                         memset(chunk, 0, sizeof(*chunk));
@@ -681,15 +677,6 @@ static int __init verify_crash_base(unsigned long crash_base,
 }
 
 /*
- * Reserve kdump memory by creating a memory hole in the mem_chunk array
- */
-static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size,
-                                         int type)
-{
-        create_mem_hole(memory_chunk, addr, size, type);
-}
-
-/*
  * When kdump is enabled, we have to ensure that no memory from
  * the area [0 - crashkernel memory size] and
  * [crashk_res.start - crashk_res.end] is set offline.
@@ -730,8 +717,8 @@ static void reserve_oldmem(void)
 
                 real_size = max(real_size, chunk->addr + chunk->size);
         }
-        reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM);
-        reserve_kdump_bootmem(OLDMEM_SIZE, real_size - OLDMEM_SIZE, CHUNK_OLDMEM);
+        create_mem_hole(memory_chunk, OLDMEM_BASE, OLDMEM_SIZE);
+        create_mem_hole(memory_chunk, OLDMEM_SIZE, real_size - OLDMEM_SIZE);
         if (OLDMEM_BASE + OLDMEM_SIZE == real_size)
                 saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1;
         else
@@ -774,7 +761,7 @@ static void __init reserve_crashkernel(void)
         crashk_res.start = crash_base;
         crashk_res.end = crash_base + crash_size - 1;
         insert_resource(&iomem_resource, &crashk_res);
-        reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK);
+        create_mem_hole(memory_chunk, crash_base, crash_size);
         pr_info("Reserving %lluMB of memory at %lluMB "
                 "for crashkernel (System RAM: %luMB)\n",
                 crash_size >> 20, crash_base >> 20, memory_end >> 20);
@@ -846,11 +833,10 @@ static void __init setup_memory(void)
          * Register RAM areas with the bootmem allocator.
          */
 
-        for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
+        for (i = 0; i < MEMORY_CHUNKS; i++) {
                 unsigned long start_chunk, end_chunk, pfn;
 
-                if (memory_chunk[i].type != CHUNK_READ_WRITE &&
-                    memory_chunk[i].type != CHUNK_CRASHK)
+                if (!memory_chunk[i].size)
                         continue;
                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);