Re: [41/41] powerpc: Fix build with CONFIG_MEMORY_HOTPLUG on some configs

[Michael Ellerman]

On Tue, 2016-05-07 at 05:07:54 UTC, Benjamin Herrenschmidt wrote:
> For memory hotplug to work, the MMU code needs to provide the functions
> create_section_mapping() and remove_section_mapping() to respectively
> map and unmap portions of the linear mapping.
> 
> At the moment only hash64 provides these, so we provide weak stubs that
> just error out. This fixes the build with configurations such as 64-bit
> BookE with CONFIG_MEMORY_HOTPLUG enabled.
> 
> Signed-off-by: Benjamin Herrenschmidt 

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/fecbfabe1dc940525f26eb1683

cheers
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[PATCH 41/41] powerpc: Fix build with CONFIG_MEMORY_HOTPLUG on some configs

[Benjamin Herrenschmidt]

For memory hotplug to work, the MMU code needs to provide the functions
create_section_mapping() and remove_section_mapping() to respectively
map and unmap portions of the linear mapping.

At the moment only hash64 provides these, so we provide weak stubs that
just error out. This fixes the build with configurations such as 64-bit
BookE with CONFIG_MEMORY_HOTPLUG enabled.

Signed-off-by: Benjamin Herrenschmidt 
---
 arch/powerpc/mm/mem.c | 10 ++
 1 file changed, 10 insertions(+)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 2fd57fa..b0b8f25 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -116,6 +116,16 @@ int memory_add_physaddr_to_nid(u64 start)
 }
 #endif
 
+int __weak create_section_mapping(unsigned long start, unsigned long end)
+{
+   return -ENODEV;
+}
+
+int __weak remove_section_mapping(unsigned long start, unsigned long end)
+{
+   return -ENODEV;
+}
+
 int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
 {
struct pglist_data *pgdata;
-- 
2.7.4

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