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authorTejun Heo <tj@kernel.org>2009-08-14 15:00:50 +0900
committerTejun Heo <tj@kernel.org>2009-08-14 15:00:50 +0900
commitf58dc01ba2ca9fe3ab2ba4ca43d9c8a735cf62d8 (patch)
tree9eb76a0d6aa34e56f8650fe98a5ce26891a522ab /mm/percpu.c
parent08fc45806103e59a37418e84719b878f9bb32540 (diff)
downloadvexpress-lsk-f58dc01ba2ca9fe3ab2ba4ca43d9c8a735cf62d8.tar.gz
percpu: generalize first chunk allocator selection
Now that all first chunk allocators are in mm/percpu.c, it makes sense to make generalize percpu_alloc kernel parameter. Define PCPU_FC_* and set pcpu_chosen_fc using early_param() in mm/percpu.c. Arch code can use the set value to determine which first chunk allocator to use. Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'mm/percpu.c')
-rw-r--r--mm/percpu.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/mm/percpu.c b/mm/percpu.c
index 7971997de31..7fb40bb1555 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1414,6 +1414,38 @@ size_t __init pcpu_setup_first_chunk(size_t static_size, size_t reserved_size,
return pcpu_unit_size;
}
+const char *pcpu_fc_names[PCPU_FC_NR] __initdata = {
+ [PCPU_FC_AUTO] = "auto",
+ [PCPU_FC_EMBED] = "embed",
+ [PCPU_FC_PAGE] = "page",
+ [PCPU_FC_LPAGE] = "lpage",
+};
+
+enum pcpu_fc pcpu_chosen_fc __initdata = PCPU_FC_AUTO;
+
+static int __init percpu_alloc_setup(char *str)
+{
+ if (0)
+ /* nada */;
+#ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK
+ else if (!strcmp(str, "embed"))
+ pcpu_chosen_fc = PCPU_FC_EMBED;
+#endif
+#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
+ else if (!strcmp(str, "page"))
+ pcpu_chosen_fc = PCPU_FC_PAGE;
+#endif
+#ifdef CONFIG_NEED_PER_CPU_LPAGE_FIRST_CHUNK
+ else if (!strcmp(str, "lpage"))
+ pcpu_chosen_fc = PCPU_FC_LPAGE;
+#endif
+ else
+ pr_warning("PERCPU: unknown allocator %s specified\n", str);
+
+ return 0;
+}
+early_param("percpu_alloc", percpu_alloc_setup);
+
static inline size_t pcpu_calc_fc_sizes(size_t static_size,
size_t reserved_size,
ssize_t *dyn_sizep)