[PATCH 6.6 008/322] powerpc/64s: Fix CONFIG_NUMA=n build due to create_section_mapping()

Greg Kroah-Hartman
2024-02-03T04:11:30Z

From: Michael Ellerman <mpe@ellerman.id.au>

[ Upstream commit ede66cd22441820cbd399936bf84fdc4294bc7fa ]

With CONFIG_NUMA=n the build fails with:

arch/powerpc/mm/book3s64/pgtable.c:275:15: error: no previous prototype for ‘create_section_mapping’ [-Werror=missing-prototypes]
275 | int __meminit create_section_mapping(unsigned long start, unsigned long end,
| ^~~~~~~~~~~~~~~~~~~~~~

That happens because the prototype for create_section_mapping() is in
asm/mmzone.h, but asm/mmzone.h is only included by linux/mmzone.h
when CONFIG_NUMA=y.

In fact the prototype is only needed by arch/powerpc/mm code, so move
the prototype into arch/powerpc/mm/mmu_decl.h, which also fixes the
build error.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231129131919.2528517-5-mpe@ellerman.id.au
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/powerpc/include/asm/mmzone.h | 5 -----
arch/powerpc/mm/mmu_decl.h | 5 +++++
2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/include/asm/mmzone.h b/arch/powerpc/include/asm/mmzone.h
index 3764d3585d30..da827d2d0866 100644
--- a/arch/powerpc/include/asm/mmzone.h
+++ b/arch/powerpc/include/asm/mmzone.h
@@ -43,10 +43,5 @@ u64 memory_hotplug_max(void);
#define memory_hotplug_max() memblock_end_of_DRAM()
#endif /* CONFIG_NUMA */

-#ifdef CONFIG_MEMORY_HOTPLUG
-extern int create_section_mapping(unsigned long start, unsigned long end,
- int nid, pgprot_t prot);
-#endif
-
#endif /* __KERNEL__ */
#endif /* _ASM_MMZONE_H_ */
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index 7f9ff0640124..72341b9fb552 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -181,3 +181,8 @@ static inline bool debug_pagealloc_enabled_or_kfence(void)
{
return IS_ENABLED(CONFIG_KFENCE) || debug_pagealloc_enabled();
}
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+int create_section_mapping(unsigned long start, unsigned long end,
+ int nid, pgprot_t prot);
+#endif
--
2.43.0