disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/mm/page_pinner.c
..
..
@@ -57,6 +57,7 @@
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 static bool page_pinner_enabled;
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 DEFINE_STATIC_KEY_FALSE(page_pinner_inited);
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+EXPORT_SYMBOL(page_pinner_inited);
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 DEFINE_STATIC_KEY_TRUE(failure_tracking);
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 EXPORT_SYMBOL(failure_tracking);