git: kernel - (mainly x86_64) - Fix a number of rare races

[Matthew Dillon]

commit 2883d2d843e07344552e83fb1e8e60cfdf565f3e
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Thu Oct 21 16:07:05 2010 -0700

    kernel - (mainly x86_64) - Fix a number of rare races
    
    * Move the MP lock from outside to inside exit1(), also fixing an issue
      where sigexit() was calling exit1() without it.
    
    * Move calls to dsched_exit_thread() and biosched_done() out of the
      platform code and into the mainline code.  This also fixes an
      issue where the code was improperly blocking way too late in the
      thread termination code, after the point where it had been descheduled
      permanently and tsleep decomissioned for the thread.
    
    * Cleanup and document related code areas.
    
    * Fix a missing proc_token release in the SIGKILL exit path.
    
    * Fix FAKE_MCOUNT()s in the x86-64 code.  These are NOPs anyway
      (since kernel profiling doesn't work), but fix them anyway.
    
    * Use APIC_PUSH_FRAME() in the Xcpustop assembly code for x86-64
      in order to properly acquire a working %gs.  This may improve the
      handling of panic()s on x86_64.
    
    * Also fix some cases if #if JG'd (ifdef'd out) code in case the
      code is ever used later on.
    
    * Protect set_user_TLS() with a critical section to be safe.
    
    * Add debug code to help track down further x86-64 seg-fault issues,
      and provide better kprintf()s for the debug path in question.

Summary of changes:
 sys/emulation/linux/i386/linux_machdep.c   |    8 +---
 sys/kern/kern_exit.c                       |   17 ++++++--
 sys/kern/kern_sig.c                        |   12 ++++--
 sys/kern/lwkt_thread.c                     |   15 ++++++-
 sys/platform/pc32/i386/trap.c              |    2 +
 sys/platform/pc32/i386/vm_machdep.c        |    2 -
 sys/platform/pc64/apic/apic_vector.s       |   56 ++++-----------------------
 sys/platform/pc64/icu/icu_vector.s         |    2 +-
 sys/platform/pc64/x86_64/exception.S       |   32 ++++++++++------
 sys/platform/pc64/x86_64/ipl.s             |   12 +++---
 sys/platform/pc64/x86_64/machdep.c         |    6 +-
 sys/platform/pc64/x86_64/swtch.s           |    4 +-
 sys/platform/pc64/x86_64/tls.c             |   11 +++++-
 sys/platform/pc64/x86_64/trap.c            |   29 ++++++++++++--
 sys/platform/pc64/x86_64/vm_machdep.c      |   14 ++++---
 sys/platform/vkernel/i386/trap.c           |    2 +
 sys/platform/vkernel/i386/vm_machdep.c     |    2 -
 sys/platform/vkernel64/x86_64/trap.c       |    2 +
 sys/platform/vkernel64/x86_64/vm_machdep.c |   13 +++---
 19 files changed, 131 insertions(+), 110 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/2883d2d843e07344552e83fb1e8e60cfdf565f3e


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