Messages in this thread | | | Subject | Re: [patch] SMP alternatives | From | Alan Cox <> | Date | Wed, 23 Nov 2005 16:42:13 +0000 |
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On Mer, 2005-11-23 at 12:17 -0700, Andi Kleen wrote: > > + /* Paranoia */ > > + asm volatile ("jmp 1f\n1:"); > > + mb(); > > That would be totally obsolete 386 era paranoia. If anything then use > a CLFLUSH (but not available on all x86s)
If you are patching code another x86 CPU is running you must halt the other processors and ensure it executes a serialzing instruction before it enters any patched code.
How many kilobytes of tables do you add to the kernel to do this pointless stunt btw ?
Alan "CPU errata are fun" Cox
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