1. 25 12月, 2008 1 次提交
    • F
      tracing/ftrace: don't trace on early stage of a secondary cpu boot, v3 · 0ca59dd9
      Frederic Weisbecker 提交于
      Impact: fix a crash/hard-reboot on certain configs while enabling cpu runtime
      
      On some archs, the boot of a secondary cpu can have an early fragile state.
      On x86-64, the pda is not initialized on the first stage of a cpu boot but
      it is needed to get the cpu number and the current task pointer. This data
      is needed during tracing. As they were dereferenced at this stage, we got a
      crash while tracing a cpu being enabled at runtime.
      
      Some other archs like ia64 can have such kind of issue too.
      
      Changes on v2:
      
      We dropped the previous solution of a per-arch called function to guess the
      current state of a cpu. That could slow down the tracing.
      
      This patch removes the -pg flag on arch/x86/kernel/cpu/common.c where
      the low level cpu boot functions exist, on start_secondary() and a helper
      function used at this stage.
      Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
      Acked-by: NSteven Rostedt <srostedt@redhat.com>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      0ca59dd9
  2. 21 12月, 2008 1 次提交
  3. 19 12月, 2008 4 次提交
  4. 18 12月, 2008 32 次提交
  5. 17 12月, 2008 2 次提交
新手
引导
客服 返回
顶部