percpu: fix percpu accessors to potentially !cpu_possible() cpus: pnpbios

Impact: CPU iterator bugfixes

Percpu areas are only allocated for possible cpus.  In general, you
shouldn't access random cpu's percpu areas.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Adam Belay <ambx1@neo.rr.com>

diff --git a/drivers/pnp/pnpbios/bioscalls.c b/drivers/pnp/pnpbios/bioscalls.c
index 7ff8244..7e6b5a3 100644 (file)
--- a/drivers/pnp/pnpbios/bioscalls.c
+++ b/drivers/pnp/pnpbios/bioscalls.c
@@ -481,7 +481,7 @@ void pnpbios_calls_init(union pnp_bios_install_struct *header)
 
        set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
        _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
-       for (i = 0; i < NR_CPUS; i++) {
+       for_each_possible_cpu(i) {
                struct desc_struct *gdt = get_cpu_gdt_table(i);
                if (!gdt)
                        continue;