1. 26 Apr, 2016 2 commits
  2. 25 Apr, 2016 9 commits
  3. 22 Apr, 2016 3 commits
  4. 21 Apr, 2016 2 commits
  5. 20 Apr, 2016 8 commits
  6. 19 Apr, 2016 5 commits
  7. 15 Apr, 2016 9 commits
  8. 14 Apr, 2016 2 commits
    • James Morse's avatar
      arm64: mm: Add trace_irqflags annotations to do_debug_exception() · 6afedcd2
      James Morse authored
      With CONFIG_PROVE_LOCKING, CONFIG_DEBUG_LOCKDEP and CONFIG_TRACE_IRQFLAGS
      enabled, lockdep will compare current->hardirqs_enabled with the flags from
      local_irq_save().
      
      When a debug exception occurs, interrupts are disabled in entry.S, but
      lockdep isn't told, resulting in:
      DEBUG_LOCKS_WARN_ON(current->hardirqs_enabled)
      ------------[ cut here ]------------
      WARNING: at ../kernel/locking/lockdep.c:3523
      Modules linked in:
      CPU: 3 PID: 1752 Comm: perf Not tainted 4.5.0-rc4+ #2204
      Hardware name: ARM Juno development board (r1) (DT)
      task: ffffffc974868000 ti: ffffffc975f40000 task.ti: ffffffc975f40000
      PC is at check_flags.part.35+0x17c/0x184
      LR is at check_flags.part.35+0x17c/0x184
      pc : [<ffffff80080fc93c>] lr : [<ffffff80080fc93c>] pstate: 600003c5
      [...]
      ---[ end trace 74631f9305ef5020 ]---
      Call trace:
      [<ffffff80080fc93c>] check_flags.part.35+0x17c/0x184
      [<ffffff80080ffe30>] lock_acquire+0xa8/0xc4
      [<ffffff8008093038>] breakpoint_handler+0x118/0x288
      [<ffffff8008082434>] do_debug_exception+0x3c/0xa8
      [<ffffff80080854b4>] el1_dbg+0x18/0x6c
      [<ffffff80081e82f4>] do_filp_open+0x64/0xdc
      [<ffffff80081d6e60>] do_sys_open+0x140/0x204
      [<ffffff80081d6f58>] SyS_openat+0x10/0x18
      [<ffffff8008085d30>] el0_svc_naked+0x24/0x28
      possible reason: unannotated irqs-off.
      irq event stamp: 65857
      hardirqs last  enabled at (65857): [<ffffff80081fb1c0>] lookup_mnt+0xf4/0x1b4
      hardirqs last disabled at (65856): [<ffffff80081fb188>] lookup_mnt+0xbc/0x1b4
      softirqs last  enabled at (65790): [<ffffff80080bdca4>] __do_softirq+0x1f8/0x290
      softirqs last disabled at (65757): [<ffffff80080be038>] irq_exit+0x9c/0xd0
      
      This patch adds the annotations to do_debug_exception(), while trying not
      to call trace_hardirqs_off() if el1_dbg() interrupted a task that already
      had irqs disabled.
      Signed-off-by: default avatarJames Morse <james.morse@arm.com>
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      6afedcd2
    • Anna-Maria Gleixner's avatar
      arm64: hw-breakpoint: Remove superfluous SMP function call · 4bc49274
      Anna-Maria Gleixner authored
      Since commit 1cf4f629 ("cpu/hotplug: Move online calls to
      hotplugged cpu") it is ensured that callbacks of CPU_ONLINE and
      CPU_DOWN_PREPARE are processed on the hotplugged CPU. Due to this SMP
      function calls are no longer required.
      
      Replace smp_call_function_single() with a direct call of
      hw_breakpoint_reset(). To keep the calling convention, interrupts are
      explicitly disabled around the call.
      
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: linux-arm-kernel@lists.infradead.org
      Signed-off-by: default avatarAnna-Maria Gleixner <anna-maria@linutronix.de>
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      4bc49274