From e5d709bb5fb758281b5a5dbda50823bb68b3a066 Mon Sep 17 00:00:00 2001
From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Thu, 2 May 2013 09:15:58 +0200
Subject: [PATCH] s390/memory hotplug: provide memory_block_size_bytes()
function
Commit 0c2c99b1b "memory hotplug: Allow memory blocks to span
multiple memory sections" introduced a weak memory_block_size_bytes()
function which can be used to set the size of a memory block as
seen in sysfs.
Provide an s390 specific override which makes sure that each
memory block has at least a size of 256MB or the increment size of
of a memory increment, whatever is larger.
This way we can make sure that the number of memory sysfs objects
doesn't explode for very large memory configurations.
Reported-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
arch/s390/mm/init.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 0b09b2342302d..89ebae4008f2f 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -21,6 +21,7 @@
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
+#include <linux/memory.h>
#include <linux/pfn.h>
#include <linux/poison.h>
#include <linux/initrd.h>
@@ -36,6 +37,7 @@
#include <asm/tlbflush.h>
#include <asm/sections.h>
#include <asm/ctl_reg.h>
+#include <asm/sclp.h>
pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
@@ -214,6 +216,15 @@ int arch_add_memory(int nid, u64 start, u64 size)
return rc;
}
+unsigned long memory_block_size_bytes(void)
+{
+ /*
+ * Make sure the memory block size is always greater
+ * or equal than the memory increment size.
+ */
+ return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp_get_rzm());
+}
+
#ifdef CONFIG_MEMORY_HOTREMOVE
int arch_remove_memory(u64 start, u64 size)
{
--
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