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percpu: generalize first chunk allocator selection

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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>
This commit is contained in:
Tejun Heo
2009-08-14 15:00:50 +09:00
parent 08fc458061
commit f58dc01ba2
4 changed files with 56 additions and 23 deletions
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24
arch/x86/kernel/setup_percpu.c
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@ -267,16 +267,6 @@ static ssize_t __init setup_pcpu_page(size_t static_size)
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 @@ void __init setup_per_cpu_areas(void)
* 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);