Messages in this thread | | | Subject | Re: [PATCH] Linux Kernel Markers | From | Alan Cox <> | Date | Wed, 20 Sep 2006 11:30:26 +0100 |
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Ar Mer, 2006-09-20 am 11:39 +0200, ysgrifennodd Helge Hafting: > Yes, 5 bytes is not an atomic write except on 64-bit. So a race is possible.
Untrue as well. Pentium and later have CMPXCHG8.
> How about this workaround: > 1. Overwrite the start of the function with a hlt, which is atomic. > 2. Write that 5-byte jump after the hlt. > 3. Overwrite the hlt with nop so things will work > 4. interrupt any cpus that got stuck on the hlt - or just wait for the > timer.
CPU errata time again. You have to synchronize.
Alan
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