linux-kernel - [PATCH 1/8] register bootmem pages for powerpc when sparse vmemmap is not defined

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Date:	Wed, 24 Jul 2013 13:35:11 -0500
From:	Nathan Fontenot <nfont@...ux.vnet.ibm.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	linuxppc-dev@...ts.ozlabs.org
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	isimatu.yasuaki@...fujitsu.com
Subject: [PATCH 1/8] register bootmem pages for powerpc when sparse vmemmap
 is not defined

Previous commit 46723bfa540... introduced a new config option
HAVE_BOOTMEM_INFO_NODE that ended up breaking memory hot-remove for powerpc
when sparse vmemmap is not defined.

This patch defines HAVE_BOOTMEM_INFO_NODE for powerpc and adds the call to
register_page_bootmem_info_node. Without this patch we get a BUG_ON for memory
hot remove in put_page_bootmem().

This also adds a stub for register_page_bootmem_memmap to allow powerpc to
build with sparse vmemmap defined.

Signed-off-by: Nathan Fontenot <nfont@...ux.vnet.ibm.com>
---

---
 arch/powerpc/mm/init_64.c |    6 ++++++
 arch/powerpc/mm/mem.c     |    9 +++++++++
 mm/Kconfig                |    2 +-
 3 files changed, 16 insertions(+), 1 deletion(-)

Index: linux/arch/powerpc/mm/init_64.c
===================================================================
--- linux.orig/arch/powerpc/mm/init_64.c
+++ linux/arch/powerpc/mm/init_64.c
@@ -300,5 +300,11 @@ void vmemmap_free(unsigned long start, u
 {
 }
 
+void register_page_bootmem_memmap(unsigned long section_nr,
+				  struct page *start_page, unsigned long size)
+{
+	WARN_ONCE(1, KERN_INFO
+		  "Sparse Vmemmap not fully supported for bootmem info nodes\n");
+}
 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
 
Index: linux/arch/powerpc/mm/mem.c
===================================================================
--- linux.orig/arch/powerpc/mm/mem.c
+++ linux/arch/powerpc/mm/mem.c
@@ -297,12 +297,21 @@ void __init paging_init(void)
 }
 #endif /* ! CONFIG_NEED_MULTIPLE_NODES */
 
+static void __init register_page_bootmem_info(void)
+{
+	int i;
+
+	for_each_online_node(i)
+		register_page_bootmem_info_node(NODE_DATA(i));
+}
+
 void __init mem_init(void)
 {
 #ifdef CONFIG_SWIOTLB
 	swiotlb_init(0);
 #endif
 
+	register_page_bootmem_info();
 	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
 	set_max_mapnr(max_pfn);
 	free_all_bootmem();
Index: linux/mm/Kconfig
===================================================================
--- linux.orig/mm/Kconfig
+++ linux/mm/Kconfig
@@ -183,7 +183,7 @@ config MEMORY_HOTPLUG_SPARSE
 config MEMORY_HOTREMOVE
 	bool "Allow for memory hot remove"
 	select MEMORY_ISOLATION
-	select HAVE_BOOTMEM_INFO_NODE if X86_64
+	select HAVE_BOOTMEM_INFO_NODE if (X86_64 || PPC64)
 	depends on MEMORY_HOTPLUG && ARCH_ENABLE_MEMORY_HOTREMOVE
 	depends on MIGRATION
 


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