Merge branch 'next' (accumulated 3.16 merge window patches) into master

Now that 3.15 is released, this merges the 'next' branch into 'master',
bringing us to the normal situation where my 'master' branch is the
merge window.

* accumulated work in next: (6809 commits)
  ufs: sb mutex merge + mutex_destroy
  powerpc: update comments for generic idle conversion
  cris: update comments for generic idle conversion
  idle: remove cpu_idle() forward declarations
  nbd: zero from and len fields in NBD_CMD_DISCONNECT.
  mm: convert some level-less printks to pr_*
  MAINTAINERS: adi-buildroot-devel is moderated
  MAINTAINERS: add linux-api for review of API/ABI changes
  mm/kmemleak-test.c: use pr_fmt for logging
  fs/dlm/debug_fs.c: replace seq_printf by seq_puts
  fs/dlm/lockspace.c: convert simple_str to kstr
  fs/dlm/config.c: convert simple_str to kstr
  mm: mark remap_file_pages() syscall as deprecated
  mm: memcontrol: remove unnecessary memcg argument from soft limit functions
  mm: memcontrol: clean up memcg zoneinfo lookup
  mm/memblock.c: call kmemleak directly from memblock_(alloc|free)
  mm/mempool.c: update the kmemleak stack trace for mempool allocations
  lib/radix-tree.c: update the kmemleak stack trace for radix tree allocations
  mm: introduce kmemleak_update_trace()
  mm/kmemleak.c: use %u to print ->checksum
  ...

1 files changed, 30 insertions, 100 deletions

diff --git a/arch/s390/mm/mem_detect.c b/arch/s390/mm/mem_detect.c
index cca388253a3..5535cfe0ee1 100644
--- a/arch/s390/mm/mem_detect.c
+++ b/arch/s390/mm/mem_detect.c
@@ -6,130 +6,60 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/memblock.h>
+#include <linux/init.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
 #include <asm/ipl.h>
 #include <asm/sclp.h>
 #include <asm/setup.h>
 
 #define ADDR2G (1ULL << 31)
 
-static void find_memory_chunks(struct mem_chunk chunk[], unsigned long maxsize)
+#define CHUNK_READ_WRITE 0
+#define CHUNK_READ_ONLY  1
+
+static inline void memblock_physmem_add(phys_addr_t start, phys_addr_t size)
+{
+	memblock_add_range(&memblock.memory, start, size, 0, 0);
+	memblock_add_range(&memblock.physmem, start, size, 0, 0);
+}
+
+void __init detect_memory_memblock(void)
 {
 	unsigned long long memsize, rnmax, rzm;
-	unsigned long addr = 0, size;
-	int i = 0, type;
+	unsigned long addr, size;
+	int type;
 
 	rzm = sclp_get_rzm();
 	rnmax = sclp_get_rnmax();
 	memsize = rzm * rnmax;
 	if (!rzm)
 		rzm = 1ULL << 17;
-	if (sizeof(long) == 4) {
+	if (IS_ENABLED(CONFIG_32BIT)) {
 		rzm = min(ADDR2G, rzm);
-		memsize = memsize ? min(ADDR2G, memsize) : ADDR2G;
+		memsize = min(ADDR2G, memsize);
 	}
-	if (maxsize)
-		memsize = memsize ? min((unsigned long)memsize, maxsize) : maxsize;
+	max_physmem_end = memsize;
+	addr = 0;
+	/* keep memblock lists close to the kernel */
+	memblock_set_bottom_up(true);
 	do {
 		size = 0;
 		type = tprot(addr);
 		do {
 			size += rzm;
-			if (memsize && addr + size >= memsize)
+			if (max_physmem_end && addr + size >= max_physmem_end)
 				break;
 		} while (type == tprot(addr + size));
 		if (type == CHUNK_READ_WRITE || type == CHUNK_READ_ONLY) {
-			if (memsize && (addr + size > memsize))
-				size = memsize - addr;
-			chunk[i].addr = addr;
-			chunk[i].size = size;
-			chunk[i].type = type;
-			i++;
+			if (max_physmem_end && (addr + size > max_physmem_end))
+				size = max_physmem_end - addr;
+			memblock_physmem_add(addr, size);
 		}
 		addr += size;
-	} while (addr < memsize && i < MEMORY_CHUNKS);
-}
-
-/**
- * detect_memory_layout - fill mem_chunk array with memory layout data
- * @chunk: mem_chunk array to be filled
- * @maxsize: maximum address where memory detection should stop
- *
- * Fills the passed in memory chunk array with the memory layout of the
- * machine. The array must have a size of at least MEMORY_CHUNKS and will
- * be fully initialized afterwards.
- * If the maxsize paramater has a value > 0 memory detection will stop at
- * that address. It is guaranteed that all chunks have an ending address
- * that is smaller than maxsize.
- * If maxsize is 0 all memory will be detected.
- */
-void detect_memory_layout(struct mem_chunk chunk[], unsigned long maxsize)
-{
-	unsigned long flags, flags_dat, cr0;
-
-	memset(chunk, 0, MEMORY_CHUNKS * sizeof(struct mem_chunk));
-	/*
-	 * Disable IRQs, DAT and low address protection so tprot does the
-	 * right thing and we don't get scheduled away with low address
-	 * protection disabled.
-	 */
-	local_irq_save(flags);
-	flags_dat = __arch_local_irq_stnsm(0xfb);
-	/*
-	 * In case DAT was enabled, make sure chunk doesn't reside in vmalloc
-	 * space. We have disabled DAT and any access to vmalloc area will
-	 * cause an exception.
-	 * If DAT was disabled we are called from early ipl code.
-	 */
-	if (test_bit(5, &flags_dat)) {
-		if (WARN_ON_ONCE(is_vmalloc_or_module_addr(chunk)))
-			goto out;
-	}
-	__ctl_store(cr0, 0, 0);
-	__ctl_clear_bit(0, 28);
-	find_memory_chunks(chunk, maxsize);
-	__ctl_load(cr0, 0, 0);
-out:
-	__arch_local_irq_ssm(flags_dat);
-	local_irq_restore(flags);
-}
-EXPORT_SYMBOL(detect_memory_layout);
-
-/*
- * Create memory hole with given address and size.
- */
-void create_mem_hole(struct mem_chunk mem_chunk[], unsigned long addr,
-		     unsigned long size)
-{
-	int i;
-
-	for (i = 0; i < MEMORY_CHUNKS; i++) {
-		struct mem_chunk *chunk = &mem_chunk[i];
-
-		if (chunk->size == 0)
-			continue;
-		if (addr > chunk->addr + chunk->size)
-			continue;
-		if (addr + size <= chunk->addr)
-			continue;
-		/* Split */
-		if ((addr > chunk->addr) &&
-		    (addr + size < chunk->addr + chunk->size)) {
-			struct mem_chunk *new = chunk + 1;
-
-			memmove(new, chunk, (MEMORY_CHUNKS-i-1) * sizeof(*new));
-			new->addr = addr + size;
-			new->size = chunk->addr + chunk->size - new->addr;
-			chunk->size = addr - chunk->addr;
-			continue;
-		} else if ((addr <= chunk->addr) &&
-			   (addr + size >= chunk->addr + chunk->size)) {
-			memmove(chunk, chunk + 1, (MEMORY_CHUNKS-i-1) * sizeof(*chunk));
-			memset(&mem_chunk[MEMORY_CHUNKS-1], 0, sizeof(*chunk));
-		} else if (addr + size < chunk->addr + chunk->size) {
-			chunk->size =  chunk->addr + chunk->size - addr - size;
-			chunk->addr = addr + size;
-		} else if (addr > chunk->addr) {
-			chunk->size = addr - chunk->addr;
-		}
-	}
+	} while (addr < max_physmem_end);
+	memblock_set_bottom_up(false);
+	if (!max_physmem_end)
+		max_physmem_end = memblock_end_of_DRAM();
 }