tracehook: CONFIG_HAVE_ARCH_TRACEHOOK

This adds the generic HAVE_ARCH_TRACEHOOK kconfig item.  Each arch should
add to some Kconfig file:

	select HAVE_ARCH_TRACEHOOK

if the arch code uses all the latest hooks to enable newfangled tracing
and debugging code.  The comment in arch/Kconfig lists all the
prerequisite arch support.  When all these are available, setting
HAVE_ARCH_TRACEHOOK will allow enabling any new features that depend on
the modern arch interfaces.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index b0fabfa864ff..364c6dadde0a 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -59,6 +59,24 @@ config HAVE_KPROBES
 config HAVE_KRETPROBES
         def_bool n
 
+#
+# An arch should select this if it provides all these things:
+#
+#       task_pt_regs()          in asm/processor.h or asm/ptrace.h
+#       arch_has_single_step()  if there is hardware single-step support
+#       arch_has_block_step()   if there is hardware block-step support
+#       arch_ptrace()           and not #define __ARCH_SYS_PTRACE
+#       compat_arch_ptrace()    and #define __ARCH_WANT_COMPAT_SYS_PTRACE
+#       asm/syscall.h           supplying asm-generic/syscall.h interface
+#       linux/regset.h          user_regset interfaces
+#       CORE_DUMP_USE_REGSET    #define'd in linux/elf.h
+#       TIF_SYSCALL_TRACE       calls tracehook_report_syscall_{entry,exit}
+#       TIF_NOTIFY_RESUME       calls tracehook_notify_resume()
+#       signal delivery         calls tracehook_signal_handler()
+#
+config HAVE_ARCH_TRACEHOOK
+        def_bool n
+
 config HAVE_DMA_ATTRS
         def_bool n