linux-kernel - [PATCH 2/3] percpu: fix percpu accessors to potentially !cpu

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Message-Id: <200811212110.25549.rusty@rustcorp.com.au>
Date:	Fri, 21 Nov 2008 21:10:25 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Adam Belay <ambx1@....rr.com>
Cc:	Adam Belay <ambx1@....rr.com>
Subject: [PATCH 2/3] 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@...tcorp.com.au>
Signed-off-by: Mike Travis <travis@....com>
Acked-by: Ingo Molnar <mingo@...e.hu>
Cc: Adam Belay <ambx1@....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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