alnoconfig complains:
arch/x86/kernel/setup.c: In function ‘setup_arch’:
arch/x86/kernel/setup.c:917: error: implicit declaration of function 
‘early_parse_srat’

because early_parse_srat is not declared for !CONFIG_ACPI. Moreover it
is defined only for CONFIG_ACPI_NUMA.

I am not sure what is the correct way to fix this but I guess that
providing an empty definition for !CONFIG_ACPI_NUMA is OK.

Cc: Tang Chen <[email protected]>
Cc: Wen Congyang <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Cc: Jiang Liu <[email protected]>
Cc: Jianguo Wu <[email protected]>
Cc: Kamezawa Hiroyuki <[email protected]>
Cc: Lai Jiangshan <[email protected]>
Cc: Wu Jianguo <[email protected]>
Cc: Yasuaki Ishimatsu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Len Brown <[email protected]>
Cc: "Brown, Len" <[email protected]>
Signed-off-by: Michal Hocko <[email protected]>
---
 include/linux/acpi.h |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index b29e0aa..4c66ac0 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -83,7 +83,6 @@ int acpi_boot_init (void);
 void acpi_boot_table_init (void);
 int acpi_mps_check (void);
 int acpi_numa_init (void);
-void __init early_parse_srat(void);
 
 int acpi_table_init (void);
 int acpi_table_parse (char *id, acpi_table_handler handler);
@@ -421,6 +420,14 @@ static inline int acpi_nvs_for_each_region(int 
(*func)(__u64, __u64, void *),
 
 #endif /* !CONFIG_ACPI */
 
+#ifdef CONFIG_ACPI_NUMA
+void __init early_parse_srat(void);
+#else
+static inline void early_parse_srat(void)
+{
+}
+#endif
+
 #ifdef CONFIG_ACPI
 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
                               u32 pm1a_ctrl,  u32 pm1b_ctrl));
-- 
1.7.10.4

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