linux-kernel - Re: [PATCH 8/8] Convert PDA into the percpu section

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Message-ID: <45F6DC27.8000200@goop.org>
Date:	Tue, 13 Mar 2007 10:15:19 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Zachary Amsden <zach@...are.com>,
	Jeremy Fitzhardinge <jeremy@...source.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>
Subject: Re: [PATCH 8/8] Convert PDA into the percpu section

Rusty Russell wrote:
> +	pack_descriptor((u32 *)&gdt[GDT_ENTRY_PERCPU].a,
> +			(u32 *)&gdt[GDT_ENTRY_PERCPU].b,
> +			__per_cpu_offset[cpu], 0xFFFFF,
>  			0x80 | DESCTYPE_S | 0x2, 0); /* present read-write data segment */
>   

Why testing with qemu is not enough.

diff -r 8dcd1dc9b298 arch/i386/kernel/cpu/common.c
--- a/arch/i386/kernel/cpu/common.c	Tue Mar 13 00:33:37 2007 -0700
+++ b/arch/i386/kernel/cpu/common.c	Tue Mar 13 08:33:42 2007 -0700
@@ -627,7 +627,7 @@ __cpuinit void init_gdt(int cpu, struct 
 	pack_descriptor((u32 *)&gdt[GDT_ENTRY_PERCPU].a,
 			(u32 *)&gdt[GDT_ENTRY_PERCPU].b,
 			__per_cpu_offset[cpu], 0xFFFFF,
-			0x80 | DESCTYPE_S | 0x2, 0); /* present read-write data segment */
+			0x80 | DESCTYPE_S | 0x2, 0x8); /* present read-write data segment, G */
 	per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu];
 	per_cpu(cpu_number, cpu) = cpu;
 #endif /* SMP*/

    J
-
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