write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/include/linux/percpu.h
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@@ -19,35 +19,6 @@
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 #define PERCPU_MODULE_RESERVE		0
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 #endif
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-#ifdef CONFIG_PREEMPT_RT_FULL
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-
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-#define get_local_var(var) (*({	\
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-	migrate_disable();	\
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-	this_cpu_ptr(&var);	}))
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-
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-#define put_local_var(var) do {	\
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-	(void)&(var);		\
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-	migrate_enable();	\
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-} while (0)
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-
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-# define get_local_ptr(var) ({	\
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-	migrate_disable();	\
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-	this_cpu_ptr(var);	})
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-
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-# define put_local_ptr(var) do {	\
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-	(void)(var);			\
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-	migrate_enable();		\
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-} while (0)
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-
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-#else
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-
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-#define get_local_var(var)	get_cpu_var(var)
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-#define put_local_var(var)	put_cpu_var(var)
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-#define get_local_ptr(var)	get_cpu_ptr(var)
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-#define put_local_ptr(var)	put_cpu_ptr(var)
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-
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-#endif
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-
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 /* minimum unit size, also is the maximum supported allocation size */
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 #define PCPU_MIN_UNIT_SIZE		PFN_ALIGN(32 << 10)
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@@ -55,16 +26,10 @@
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 #define PCPU_MIN_ALLOC_SHIFT		2
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 #define PCPU_MIN_ALLOC_SIZE		(1 << PCPU_MIN_ALLOC_SHIFT)
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-/* number of bits per page, used to trigger a scan if blocks are > PAGE_SIZE */
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-#define PCPU_BITS_PER_PAGE		(PAGE_SIZE >> PCPU_MIN_ALLOC_SHIFT)
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-
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 /*
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- * This determines the size of each metadata block.  There are several subtle
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- * constraints around this constant.  The reserved region must be a multiple of
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- * PCPU_BITMAP_BLOCK_SIZE.  Additionally, PCPU_BITMAP_BLOCK_SIZE must be a
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- * multiple of PAGE_SIZE or PAGE_SIZE must be a multiple of
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- * PCPU_BITMAP_BLOCK_SIZE to align with the populated page map. The unit_size
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- * also has to be a multiple of PCPU_BITMAP_BLOCK_SIZE to ensure full blocks.
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+ * The PCPU_BITMAP_BLOCK_SIZE must be the same size as PAGE_SIZE as the
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+ * updating of hints is used to manage the nr_empty_pop_pages in both
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+ * the chunk and globally.
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  */
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 #define PCPU_BITMAP_BLOCK_SIZE		PAGE_SIZE
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 #define PCPU_BITMAP_BLOCK_BITS		(PCPU_BITMAP_BLOCK_SIZE >>	\
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@@ -140,7 +105,7 @@
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 							     int nr_units);
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 extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai);
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-extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
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+extern void __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
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 					 void *base_addr);
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 #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK