sparc64 /dev/mem locking needed ([ups@xxxxxxxxxxx: cvs commit: src/sys/i386/i386 mem.c])

[Kris Kennaway <kris@xxxxxxxxxxxxxx>]

Someone needs to port this change to sparc64, to fix the following
panic:

panic: vm_fault: fault on nofault entry, addr: e6ea4000
cpuid = 1
KDB: enter: panic
[thread pid 52621 tid 101030 ]
Stopped at      kdb_enter+0x3c: ta              %xcc, 1
db> wh
Tracing pid 52621 tid 101030 td 0xfffff800bb5f70a0
panic() at panic+0x160
vm_fault() at vm_fault+0x1b0
trap_pfault() at trap_pfault+0x1d0
trap() at trap+0x22c
-- fast data access mmu miss tar=0xe6ea4000 %o7=0xc0181088 --
copyout() at copyout+0x8c
memrw() at memrw+0x28c
giant_read() at giant_read+0x54
devfs_read_f() at devfs_read_f+0x64
dofileread() at dofileread+0x7c
kern_readv() at kern_readv+0x38
read() at read+0x4c
syscall() at syscall+0x33c
-- syscall (3, FreeBSD ELF64, read) %o7=0x4033f348 --

I get this relatively frequently when fstat(1) happens to run on two
CPUs at once:

52621 fffff80066738d40    0 52616 52110 0004100 [CPU 1] fstat
52620 fffff800f5c53a80    0 52617 52130 0004100 [CPU 8] fstat

Kris

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Date: Mon, 23 Jan 2006 15:46:10 +0000 (UTC)
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ups         2006-01-23 15:46:10 UTC

  FreeBSD src repository

  Modified files:
    sys/i386/i386        mem.c 
  Log:
  Fix race conditions.
  
  Tested by:      kris@
  MFC after:      3 days
  
  Revision  Changes    Path
  1.117     +57 -33    src/sys/i386/i386/mem.c
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