[tip:tracing/core] tracing/kprobes: Add short documentation for HAVE_REGS_AND_STACK_ACCESS_API

[tip-bot for Heiko Carstens]

Commit-ID:  e01292b1fd68ff2abe234d584b06e64344d2c1de
Gitweb:     http://git.kernel.org/tip/e01292b1fd68ff2abe234d584b06e64344d2c1de
Author:     Heiko Carstens <heiko.carstens@xxxxxxxxxx>
AuthorDate: Thu, 18 Feb 2010 14:25:21 +0100
Committer:  Frederic Weisbecker <fweisbec@xxxxxxxxx>
CommitDate: Mon, 22 Feb 2010 17:05:51 +0100

tracing/kprobes: Add short documentation for HAVE_REGS_AND_STACK_ACCESS_API

So that arch developers know how to implement it without the
need to dig into changelogs.

Reported-by: Mike Frysinger <vapier.adi@xxxxxxxxx>
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: "David S . Miller" <davem@xxxxxxxxxxxxx>
Cc: Paul Mundt <lethal@xxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
LKML-Reference: <20100218132521.GB2406@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
[added reference to ptrace.h in the config help]
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
 arch/Kconfig |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 04e3aa7..50877ef 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -123,6 +123,11 @@ config USE_GENERIC_SMP_HELPERS
 
 config HAVE_REGS_AND_STACK_ACCESS_API
 	bool
+	help
+	  This symbol should be selected by an architecure if it supports
+	  the API needed to access registers and stack entries from pt_regs,
+	  declared in asm/ptrace.h
+	  For example the kprobes-based event tracer needs this API.
 
 config HAVE_CLK
 	bool
--
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