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Subject[PATCH 04/20] percpu: build first chunk allocators selectively
Date
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: Tejun Heo <tj@kernel.org>
---
arch/x86/Kconfig | 10 ++++++++++
include/linux/percpu.h | 27 +++++----------------------
mm/percpu.c | 19 +++++++++++--------
3 files changed, 26 insertions(+), 30 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 001ad1d..5c0a3b4 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -149,6 +149,16 @@ 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

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 7989f61..e26788e 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -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;
diff --git a/mm/percpu.c b/mm/percpu.c
index 27a3033..4d926d3 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1414,8 +1414,9 @@ 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,
- ssize_t *dyn_sizep)
+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.
--
1.6.0.2


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