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xen-devel
[XenPPC] Re: [RFC PATCH 28/33] Add Xen grant table support
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To: |
Hollis Blanchard <hollisb@xxxxxxxxxx> |
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Subject: |
[XenPPC] Re: [RFC PATCH 28/33] Add Xen grant table support |
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From: |
Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx> |
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Date: |
Tue, 25 Jul 2006 21:06:51 +0200 |
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Cc: |
Andrew Morton <akpm@xxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Ian Pratt <ian.pratt@xxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxx, xen-ppc-devel <xen-ppc-devel@xxxxxxxxxxxxxxxxxxx> |
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Tue, 25 Jul 2006 12:07:11 -0700 |
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I object to these uses of (synch_)cmpxchg on a uint16_t in common
code.
Many architectures, including PowerPC, do not support 2-byte atomic
operations, but this code is common to all Xen architectures.
RMW operations you mean, I suppose. On PowerPC, all (naturally
aligned) halfword operations are atomic; there do not exist any
RMW operations; but word and doubleword atomic RMW operations
can be emulated.
Boils down to the same thing of course, but it isn't the same ;-)
Segher
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