disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/include/linux/cache.h
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@@ -15,8 +15,14 @@
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 /*
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  * __read_mostly is used to keep rarely changing variables out of frequently
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- * updated cachelines. If an architecture doesn't support it, ignore the
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- * hint.
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+ * updated cachelines. Its use should be reserved for data that is used
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+ * frequently in hot paths. Performance traces can help decide when to use
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+ * this. You want __read_mostly data to be tightly packed, so that in the
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+ * best case multiple frequently read variables for a hot path will be next
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+ * to each other in order to reduce the number of cachelines needed to
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+ * execute a critical path. We should be mindful and selective of its use.
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+ * ie: if you're going to use it please supply a *good* justification in your
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+ * commit log
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  */
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 #ifndef __read_mostly
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 #define __read_mostly
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@@ -28,7 +34,7 @@
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  * but may get written to during init, so can't live in .rodata (via "const").
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  */
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 #ifndef __ro_after_init
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-#define __ro_after_init __attribute__((__section__(".data..ro_after_init")))
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+#define __ro_after_init __section(".data..ro_after_init")
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 #endif
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 #ifndef ____cacheline_aligned