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Commit 08fc4580 authored by Tejun Heo's avatar Tejun Heo
Browse files

percpu: build first chunk allocators selectively 



There's no need to build unused first chunk allocators in.  Define
CONFIG_NEED_PER_CPU_*_FIRST_CHUNK and let archs enable them
selectively.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 00ae4064

arch/x86/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -150,6 +150,16 @@ config ARCH_HAS_CACHE_LINE_SIZE 
config HAVE_SETUP_PER_CPU_AREA

	def_bool y



config NEED_PER_CPU_EMBED_FIRST_CHUNK

	def_bool y



config NEED_PER_CPU_PAGE_FIRST_CHUNK

	def_bool y



config NEED_PER_CPU_LPAGE_FIRST_CHUNK

	def_bool y

	depends on NEED_MULTIPLE_NODES



config HAVE_CPUMASK_OF_CPU_MAP

	def_bool X86_64_SMP

include/linux/percpu.h

+5 −22
Original line number Diff line number Diff line
@@ -70,17 +70,21 @@ extern size_t __init pcpu_setup_first_chunk( 
				ssize_t dyn_size, size_t unit_size,

				void *base_addr, const int *unit_map);



#ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK

extern ssize_t __init pcpu_embed_first_chunk(

				size_t static_size, size_t reserved_size,

				ssize_t dyn_size);

#endif



#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK

extern ssize_t __init pcpu_page_first_chunk(

				size_t static_size, size_t reserved_size,

				pcpu_fc_alloc_fn_t alloc_fn,

				pcpu_fc_free_fn_t free_fn,

				pcpu_fc_populate_pte_fn_t populate_pte_fn);

#endif



#ifdef CONFIG_NEED_MULTIPLE_NODES

#ifdef CONFIG_NEED_PER_CPU_LPAGE_FIRST_CHUNK

extern int __init pcpu_lpage_build_unit_map(

				size_t static_size, size_t reserved_size,

				ssize_t *dyn_sizep, size_t *unit_sizep,
@@ -98,27 +102,6 @@ extern ssize_t __init pcpu_lpage_first_chunk( 


extern void *pcpu_lpage_remapped(void *kaddr);

#else

static inline int pcpu_lpage_build_unit_map(

				size_t static_size, size_t reserved_size,

				ssize_t *dyn_sizep, size_t *unit_sizep,

				size_t lpage_size, int *unit_map,

				pcpu_fc_cpu_distance_fn_t cpu_distance_fn)

{

	return -EINVAL;

}



static inline ssize_t __init pcpu_lpage_first_chunk(

				size_t static_size, size_t reserved_size,

				size_t dyn_size, size_t unit_size,

				size_t lpage_size, const int *unit_map,

				int nr_units,

				pcpu_fc_alloc_fn_t alloc_fn,

				pcpu_fc_free_fn_t free_fn,

				pcpu_fc_map_fn_t map_fn)

{

	return -EINVAL;

}



static inline void *pcpu_lpage_remapped(void *kaddr)

{

	return NULL;

mm/percpu.c

+11 −8
Original line number Diff line number Diff line
@@ -1414,7 +1414,8 @@ size_t __init pcpu_setup_first_chunk(size_t static_size, size_t reserved_size, 
	return pcpu_unit_size;

}



static size_t pcpu_calc_fc_sizes(size_t static_size, size_t reserved_size,

static inline size_t pcpu_calc_fc_sizes(size_t static_size,

					size_t reserved_size,

					ssize_t *dyn_sizep)

{

	size_t size_sum;
@@ -1427,6 +1428,8 @@ static size_t pcpu_calc_fc_sizes(size_t static_size, size_t reserved_size, 
	return size_sum;

}



#if defined(CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK) || \

	!defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)

/**

 * pcpu_embed_first_chunk - embed the first percpu chunk into bootmem

 * @static_size: the size of static percpu area in bytes
@@ -1495,7 +1498,10 @@ ssize_t __init pcpu_embed_first_chunk(size_t static_size, size_t reserved_size, 
	return pcpu_setup_first_chunk(static_size, reserved_size, dyn_size,

				      unit_size, base, NULL);

}

#endif /* CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK ||

	  !CONFIG_HAVE_SETUP_PER_CPU_AREA */



#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK

/**

 * pcpu_page_first_chunk - map the first chunk using PAGE_SIZE pages

 * @static_size: the size of static percpu area in bytes
@@ -1598,12 +1604,9 @@ out_free_ar: 
	free_bootmem(__pa(pages), pages_size);

	return ret;

}

#endif /* CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK */



/*

 * Large page remapping first chunk setup helper

 */

#ifdef CONFIG_NEED_MULTIPLE_NODES



#ifdef CONFIG_NEED_PER_CPU_LPAGE_FIRST_CHUNK

/**

 * pcpu_lpage_build_unit_map - build unit_map for large page remapping

 * @static_size: the size of static percpu area in bytes
@@ -1982,7 +1985,7 @@ void *pcpu_lpage_remapped(void *kaddr) 


	return NULL;

}

#endif

#endif /* CONFIG_NEED_PER_CPU_LPAGE_FIRST_CHUNK */



/*

 * Generic percpu area setup.