[PATCH 20/23] tracehook: CONFIG_HAVE_ARCH_TRACEHOOK

[Roland McGrath]

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@xxxxxxxxxx>
---
 arch/Kconfig |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index ad89a33..4641edf 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -37,6 +37,24 @@ 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
 
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