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    • Luis R. Rodriguez's avatar
      kprobes: move kprobe declarations to asm-generic/kprobes.h · 7d134b2c
      Luis R. Rodriguez authored
      Often all is needed is these small helpers, instead of compiler.h or a
      full kprobes.h.  This is important for asm helpers, in fact even some
      asm/kprobes.h make use of these helpers...  instead just keep a generic
      asm file with helpers useful for asm code with the least amount of
      clutter as possible.
      
      Likewise we need now to also address what to do about this file for both
      when architectures have CONFIG_HAVE_KPROBES, and when they do not.  Then
      for when architectures have CONFIG_HAVE_KPROBES but have disabled
      CONFIG_KPROBES.
      
      Right now most asm/kprobes.h do not have guards against CONFIG_KPROBES,
      this means most architecture code cannot include asm/kprobes.h safely.
      Correct this and add guards for architectures missing them.
      Additionally provide architectures that not have kprobes support with
      the default asm-generic solution.  This lets us force asm/kprobes.h on
      the header include/linux/kprobes.h always, but most importantly we can
      now safely include just asm/kprobes.h on architecture code without
      bringing the full kitchen sink of header files.
      
      Two architectures already provided a guard against CONFIG_KPROBES on its
      kprobes.h: sh, arch.  The rest of the architectures needed gaurds added.
      We avoid including any not-needed headers on asm/kprobes.h unless
      kprobes have been enabled.
      
      In a subsequent atomic change we can try now to remove compiler.h from
      include/linux/kprobes.h.
      
      During this sweep I've also identified a few architectures defining a
      common macro needed for both kprobes and ftrace, that of the definition
      of the breakput instruction up.  Some refer to this as
      BREAKPOINT_INSTRUCTION.  This must be kept outside of the #ifdef
      CONFIG_KPROBES guard.
      
      [mcgrof@kernel.org: fix arm64 build]
        Link: http://lkml.kernel.org/r/CAB=NE6X1WMByuARS4mZ1g9+W=LuVBnMDnh_5zyN0CLADaVh=Jw@mail.gmail.com
      [sfr@canb.auug.org.au: fixup for kprobes declarations moving]
        Link: http://lkml.kernel.org/r/20170214165933.13ebd4f4@canb.auug.org.au
      Link: http://lkml.kernel.org/r/20170203233139.32682-1-mcgrof@kernel.orgSigned-off-by: default avatarLuis R. Rodriguez <mcgrof@kernel.org>
      Signed-off-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
      Acked-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Masami Hiramatsu <mhiramat@kernel.org>
      Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
      Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
      Cc: David S. Miller <davem@davemloft.net>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7d134b2c
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