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xen-devel
[Xen-devel] Re: [PATCH 3 of 7] x86: fix paravirt clobber in entry_64.S
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To: |
Rusty Russell <rusty@xxxxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH 3 of 7] x86: fix paravirt clobber in entry_64.S |
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From: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Thu, 29 Jan 2009 01:28:00 -0800 |
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Cc: |
Zachary Amsden <zach@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Campbell <ian.campbell@xxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Ravikiran Thirumalai <kiran@xxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx> |
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Thu, 29 Jan 2009 01:28:26 -0800 |
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Rusty Russell wrote:
On Thursday 29 January 2009 09:05:03 Jeremy Fitzhardinge wrote:
The clobber is trying to say that anything except RDI is available for
clobbering, but actually clobbers everything. This hasn't mattered
because the clobbers were basically ignored, but subsequent patches
will rely on them.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Acked-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Hmm, did we never have the deliberate-clobbering debug code for 64 bit?
No. I think I killed it off before 64-bit was even started. There was
some confusion about whether the return regs were considered to be
"clobbered" or not, but I don't remember the details.
J
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