[S390] Get rid of HOLES_IN_ZONE requirement.

Align everything to MAX_ORDER so we can get rid of the extra checks.

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

3 files changed, 25 insertions, 5 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 1330061020ab..6ef54d27fc00 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -276,9 +276,6 @@ source "kernel/Kconfig.preempt"
 
 source "mm/Kconfig"
 
-config HOLES_IN_ZONE
-        def_bool y
-
 comment "I/O subsystem configuration"
 
 config MACHCHK_WARNING
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index d071a81b62da..3a61bfc2c4fb 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -559,7 +559,9 @@ setup_resources(void)
         data_resource.start = (unsigned long) &_etext;
         data_resource.end = (unsigned long) &_edata - 1;
 
-        for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
+        for (i = 0; i < MEMORY_CHUNKS; i++) {
+                if (!memory_chunk[i].size)
+                        continue;
                 res = alloc_bootmem_low(sizeof(struct resource));
                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
                 switch (memory_chunk[i].type) {
@@ -630,6 +632,27 @@ static void __init setup_memory_end(void)
         max_mem = memory_end ? min(VMALLOC_START, memory_end) : VMALLOC_START;
         memory_end = min(max_mem, memory_end);
 
+        /*
+         * Make sure all chunks are MAX_ORDER aligned so we don't need the
+         * extra checks that HOLES_IN_ZONE would require.
+         */
+        for (i = 0; i < MEMORY_CHUNKS; i++) {
+                unsigned long start, end;
+                struct mem_chunk *chunk;
+                unsigned long align;
+
+                chunk = &memory_chunk[i];
+                align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
+                start = (chunk->addr + align - 1) & ~(align - 1);
+                end = (chunk->addr + chunk->size) & ~(align - 1);
+                if (start >= end)
+                        memset(chunk, 0, sizeof(*chunk));
+                else {
+                        chunk->addr = start;
+                        chunk->size = end - start;
+                }
+        }
+
         for (i = 0; i < MEMORY_CHUNKS; i++) {
                 struct mem_chunk *chunk = &memory_chunk[i];
 
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index ee625c8c3b28..1fc99891c4eb 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -376,7 +376,7 @@ static int __init vmem_convert_memory_chunk(void)
         int i;
 
         mutex_lock(&vmem_mutex);
-        for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
+        for (i = 0; i < MEMORY_CHUNKS; i++) {
                 if (!memory_chunk[i].size)
                         continue;
                 seg = kzalloc(sizeof(*seg), GFP_KERNEL);