cvs commit: src/sys/i386/i386 vm_machdep.c
ups at FreeBSD.org
Tue Oct 11 18:41:48 PDT 2005
ups 2005-10-12 01:41:48 UTC
FreeBSD src repository
Ensure that a thread stays on same CPU when calculating per CPU
TLB shootdown requirements. Otherwise a CPU may not get the needed
The PTE valid and access flags can not be used here to avoid TLB
shootdowns unless sf->cpumask == all_cpus.
( Otherwise some CPUs may still hold an even older entry in the TLB)
Since sf_buf_alloc mappings are normally always used this is
also not really useful and presetting accessed and modified
allows the CPU to speculatively load the entry into the TLB.
Both bugs can cause random data corruption.
MFC after: 3 days
Revision Changes Path
1.261 +15 -15 src/sys/i386/i386/vm_machdep.c
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