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>
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 1e17711..b961d99 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -267,16 +267,6 @@
pcpup_populate_pte);
}
-/* for explicit first chunk allocator selection */
-static char pcpu_chosen_alloc[16] __initdata;
-
-static int __init percpu_alloc_setup(char *str)
-{
- strncpy(pcpu_chosen_alloc, str, sizeof(pcpu_chosen_alloc) - 1);
- return 0;
-}
-early_param("percpu_alloc", percpu_alloc_setup);
-
static inline void setup_percpu_segment(int cpu)
{
#ifdef CONFIG_X86_32
@@ -307,19 +297,17 @@
* each allocator for details.
*/
ret = -EINVAL;
- if (strlen(pcpu_chosen_alloc)) {
- if (strcmp(pcpu_chosen_alloc, "page")) {
- if (!strcmp(pcpu_chosen_alloc, "lpage"))
+ if (pcpu_chosen_fc != PCPU_FC_AUTO) {
+ if (pcpu_chosen_fc != PCPU_FC_PAGE) {
+ if (pcpu_chosen_fc == PCPU_FC_LPAGE)
ret = setup_pcpu_lpage(static_size, true);
- else if (!strcmp(pcpu_chosen_alloc, "embed"))
- ret = setup_pcpu_embed(static_size, true);
else
- pr_warning("PERCPU: unknown allocator %s "
- "specified\n", pcpu_chosen_alloc);
+ ret = setup_pcpu_embed(static_size, true);
+
if (ret < 0)
pr_warning("PERCPU: %s allocator failed (%zd), "
"falling back to page size\n",
- pcpu_chosen_alloc, ret);
+ pcpu_fc_names[pcpu_chosen_fc], ret);
}
} else {
ret = setup_pcpu_lpage(static_size, false);