Messages in this thread Patch in this message | | | From | Rusty Russell <> | Date | Fri, 21 Nov 2008 21:10:25 +1030 | Subject | [PATCH 2/3] percpu: fix percpu accessors to potentially !cpu_possible() cpus: pnpbios |
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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> --- drivers/pnp/pnpbios/bioscalls.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff -r --- test-compile.orig/drivers/pnp/pnpbios/bioscalls.c +++ test-compile/drivers/pnp/pnpbios/bioscalls.c @@ -481,7 +481,7 @@ void pnpbios_calls_init(union pnp_bios_i 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;
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