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From: Blue Swirl <blauwirbel@gmail.com>
To: malc <av1474@comtv.ru>
Cc: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] Re: [PATCH 09/11] i386: avoid a write only variable
Date: Thu, 7 Oct 2010 17:36:36 +0000	[thread overview]
Message-ID: <AANLkTikTXnq7N+--tmgZwnimmw31Nv2g97T5KqVWMOQ8@mail.gmail.com> (raw)
In-Reply-To: <alpine.LNX.2.00.1010071225170.1817@linmac>

On Thu, Oct 7, 2010 at 8:27 AM, malc <av1474@comtv.ru> wrote:
> On Thu, 7 Oct 2010, Paolo Bonzini wrote:
>
>> On 10/06/2010 11:34 PM, Blue Swirl wrote:
>> > Compiling with GCC 4.6.0 20100925 produced warnings:
>> > /src/qemu/target-i386/op_helper.c: In function 'switch_tss':
>> > /src/qemu/target-i386/op_helper.c:283:53: error: variable 'new_trap'
>> > set but not used [-Werror=unused-but-set-variable]
>> >
>> > Fix by deleting the variable.
>>
>> Again, this warning tells us the emulation is incorrect, so it's wrong to
>> remove it.
>>
>
> http://support.amd.com/us/Processor_TechDocs/24593.pdf
>
> 12.2.5
> T (Trap) Bit--■Bit 0 of byte 64h, static field. This bit, when set to1,
> causes a debug exception (#DB) to occur on a task switch. See "Beakpoint
> Instruction (INT3)" page 340 for additional information.

Yes, I read that before making the patch. But page 340 didn't seem to
give any relevant information.

  reply	other threads:[~2010-10-07 17:37 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-06 21:34 [Qemu-devel] [PATCH 09/11] i386: avoid a write only variable Blue Swirl
2010-10-07  7:27 ` [Qemu-devel] " Paolo Bonzini
2010-10-07  8:27   ` malc
2010-10-07 17:36     ` Blue Swirl [this message]
2010-10-07 17:44       ` malc
2010-10-07 17:32   ` Blue Swirl

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