1. 10 12月, 2006 1 次提交
  2. 15 7月, 2006 1 次提交
    • S
      [PATCH] remove set_wmb - arch removal · 52393ccc
      Steven Rostedt 提交于
      set_wmb should not be used in the kernel because it just confuses the
      code more and has no benefit.  Since it is not currently used in the
      kernel this patch removes it so that new code does not include it.
      
      All archs define set_wmb(var, value) to do { var = value; wmb(); }
      while(0) except ia64 and sparc which use a mb() instead.  But this is
      still moot since it is not used anyway.
      
      Hasn't been tested on any archs but x86 and x86_64 (and only compiled
      tested)
      Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      52393ccc
  3. 26 4月, 2006 1 次提交
  4. 20 3月, 2006 2 次提交
    • D
      [SPARC64]: Kill all %pstate changes in context switch code. · 314981ac
      David S. Miller 提交于
      They are totally unnecessary because:
      
      1) Interrupts are already disabled when switch_to()
         runs.
      
      2) We don't use hard-coded alternate globals any longer.
      
      This found a case in rtrap, which still assumed alternate
      global %g6 was current_thread_info(), and that is fixed
      by this changeset as well.
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      314981ac
    • D
      [SPARC64]: Elminate all usage of hard-coded trap globals. · 56fb4df6
      David S. Miller 提交于
      UltraSPARC has special sets of global registers which are switched to
      for certain trap types.  There is one set for MMU related traps, one
      set of Interrupt Vector processing, and another set (called the
      Alternate globals) for all other trap types.
      
      For what seems like forever we've hard coded the values in some of
      these trap registers.  Some examples include:
      
      1) Interrupt Vector global %g6 holds current processors interrupt
         work struct where received interrupts are managed for IRQ handler
         dispatch.
      
      2) MMU global %g7 holds the base of the page tables of the currently
         active address space.
      
      3) Alternate global %g6 held the current_thread_info() value.
      
      Such hardcoding has resulted in some serious issues in many areas.
      There are some code sequences where having another register available
      would help clean up the implementation.  Taking traps such as
      cross-calls from the OBP firmware requires some trick code sequences
      wherein we have to save away and restore all of the special sets of
      global registers when we enter/exit OBP.
      
      We were also using the IMMU TSB register on SMP to hold the per-cpu
      area base address, which doesn't work any longer now that we actually
      use the TSB facility of the cpu.
      
      The implementation is pretty straight forward.  One tricky bit is
      getting the current processor ID as that is different on different cpu
      variants.  We use a stub with a fancy calling convention which we
      patch at boot time.  The calling convention is that the stub is
      branched to and the (PC - 4) to return to is in register %g1.  The cpu
      number is left in %g6.  This stub can be invoked by using the
      __GET_CPUID macro.
      
      We use an array of per-cpu trap state to store the current thread and
      physical address of the current address space's page tables.  The
      TRAP_LOAD_THREAD_REG loads %g6 with the current thread from this
      table, it uses __GET_CPUID and also clobbers %g1.
      
      TRAP_LOAD_IRQ_WORK is used by the interrupt vector processing to load
      the current processor's IRQ software state into %g6.  It also uses
      __GET_CPUID and clobbers %g1.
      
      Finally, TRAP_LOAD_PGD_PHYS loads the physical address base of the
      current address space's page tables into %g7, it clobbers %g1 and uses
      __GET_CPUID.
      
      Many refinements are possible, as well as some tuning, with this stuff
      in place.
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      56fb4df6
  5. 13 1月, 2006 2 次提交
  6. 09 1月, 2006 1 次提交
  7. 09 9月, 2005 1 次提交
    • D
      [SPARC64]: Inline membar()'s again. · 4d803fcd
      David S. Miller 提交于
      Since GCC has to emit a call and a delay slot to the
      out-of-line "membar" routines in arch/sparc64/lib/mb.S
      it is much better to just do the necessary predicted
      branch inline instead as:
      
      	ba,pt	%xcc, 1f
      	 membar	#whatever
      1:
      
      instead of the current:
      
      	call	membar_foo
      	 dslot
      
      because this way GCC is not required to allocate a stack
      frame if the function can be a leaf function.
      
      This also makes this bug fix easier to backport to 2.4.x
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      4d803fcd
  8. 30 8月, 2005 1 次提交
  9. 25 7月, 2005 1 次提交
  10. 26 6月, 2005 1 次提交
    • N
      [PATCH] sched: cleanup context switch locking · 4866cde0
      Nick Piggin 提交于
      Instead of requiring architecture code to interact with the scheduler's
      locking implementation, provide a couple of defines that can be used by the
      architecture to request runqueue unlocked context switches, and ask for
      interrupts to be enabled over the context switch.
      
      Also replaces the "switch_lock" used by these architectures with an oncpu
      flag (note, not a potentially slow bitflag).  This eliminates one bus
      locked memory operation when context switching, and simplifies the
      task_running function.
      Signed-off-by: NNick Piggin <nickpiggin@yahoo.com.au>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      4866cde0
  11. 17 4月, 2005 1 次提交
    • L
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds 提交于
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4