Date: Wed, 4 Aug 2004 20:31:19 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/i386/i386 pmap.c src/sys/kern subr_witness.c Message-ID: <200408042031.i74KVKUf039025@repoman.freebsd.org>
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jhb 2004-08-04 20:31:19 UTC
FreeBSD src repository
Modified files:
sys/i386/i386 pmap.c
sys/kern subr_witness.c
Log:
Remove a potential deadlock on i386 SMP by changing the lazypmap ipi and
spin-wait code to use the same spin mutex (smp_tlb_mtx) as the TLB ipi
and spin-wait code snippets so that you can't get into the situation of
one CPU doing a TLB shootdown to another CPU that is doing a lazy pmap
shootdown each of which are waiting on each other. With this change, only
one of the CPUs would do an IPI and spin-wait at a time.
Revision Changes Path
1.493 +2 -8 src/sys/i386/i386/pmap.c
1.178 +0 -1 src/sys/kern/subr_witness.c
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