Alan Cox wrote:
On Mer, 2005-11-23 at 12:17 -0700, Andi Kleen wrote:That would be totally obsolete 386 era paranoia. If anything then use a CLFLUSH (but not available on all x86s)+ /* Paranoia */ + asm volatile ("jmp 1f\n1:"); + mb();If you are patching code another x86 CPU is running you must halt the other processors and ensure it executes a serialzing instruction beforeit enters any patched code.
Patching in/out SMP-locking with more than one active CPU would be a pretty silly idea in the first place ;)
How many kilobytes of tables do you add to the kernel to do this pointless stunt btw ?
16 .smp_altinstructions 0000ae0b c03b4000 003b4000 002b4000 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
17 .smp_altinstr_replacement 00000f6e c03bee0b 003bee0b 002bee0b 2**0
CONTENTS, ALLOC, LOAD, CODE
cheers,
Gerd
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