Commit:     a99824f327c748b2753f4fa570eb1fefcd6a9c4d
Parent:     1482471d19e77d794012dbacaa65c44ceaae37bb
Author:     Badari Pulavarty <[EMAIL PROTECTED]>
AuthorDate: Tue Feb 5 00:10:18 2008 -0800
Committer:  Paul Mackerras <[EMAIL PROTECTED]>
CommitDate: Fri Feb 8 19:52:48 2008 +1100

    [POWERPC] Add arch-specific walk_memory_remove() for 64-bit powerpc
    walk_memory_resource() verifies if there are holes in a given memory
    range, by checking against /proc/iomem.  On x86/ia64 system memory is
    represented in /proc/iomem.  On powerpc, we don't show system memory as
    IO resource in /proc/iomem - instead it's maintained in
    This provides a way for an architecture to provide its own
    walk_memory_resource() function.  On powerpc, the memory region is
    small (16MB), contiguous and non-overlapping.  So extra checking
    against the device-tree is not needed.
    Signed-off-by: Badari Pulavarty <[EMAIL PROTECTED]>
    Acked-by: KAMEZAWA Hiroyuki <[EMAIL PROTECTED]>
    Cc: Dave Hansen <[EMAIL PROTECTED]>
    Cc: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
    Cc: Kumar Gala <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Paul Mackerras <[EMAIL PROTECTED]>
 arch/powerpc/Kconfig  |    3 +++
 arch/powerpc/mm/mem.c |   17 +++++++++++++++++
 kernel/resource.c     |    2 +-
 3 files changed, 21 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index d55063c..26b963c 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -272,6 +272,9 @@ config HOTPLUG_CPU
        def_bool y
+       def_bool y
        def_bool y
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index f0a1fd2..be5c506 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -145,6 +145,23 @@ out:
        return ret;
+ * walk_memory_resource() needs to make sure there is no holes in a given
+ * memory range. On PPC64, since this range comes from /sysfs, the range
+ * is guaranteed to be valid, non-overlapping and can not contain any
+ * holes. By the time we get here (memory add or remove), /proc/device-tree
+ * is updated and correct. Only reason we need to check against device-tree
+ * would be if we allow user-land to specify a memory range through a
+ * system call/ioctl etc. instead of doing offline/online through /sysfs.
+ */
+walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void 
+                       int (*func)(unsigned long, unsigned long, void *))
+       return  (*func)(start_pfn, nr_pages, arg);
 void show_mem(void)
diff --git a/kernel/resource.c b/kernel/resource.c
index 2eb553d..82aea81 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -228,7 +228,7 @@ int release_resource(struct resource *old)
  * Finds the lowest memory reosurce exists within [res->start.res->end)
  * the caller must specify res->start, res->end, res->flags.
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