linux-kernel - Re: [PATCH] kprobes: remove sparse warnings from x86

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Message-Id: <1203012094.2748.51.camel@brick>
Date:	Thu, 14 Feb 2008 10:01:34 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [PATCH] kprobes: remove sparse warnings from x86

On Thu, 2008-02-14 at 10:08 -0500, Masami Hiramatsu wrote:
> Harvey Harrison :
> > arch/x86/kernel/kprobes.c:584:16: warning: symbol 'kretprobe_trampoline_holder' was not declared. Should it be static?
> > arch/x86/kernel/kprobes.c:676:6: warning: symbol 'trampoline_handler' was not declared. Should it be static?
> > 
> > Make them static and add the __used attribute, approach taken from the
> > arm kprobes implementation.
> > 
> > kretprobe_trampoline_holder uses inline assemly to define the global
> > symbol kretprobe_trampoline, but nothing ever calls the holder explicitly.
> > 
> > trampoline handler is only called from inline assembly in the same file,
> > mark it used and static.
> > 
> > Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
> 
> It looks good to me.
> 
> Acked-by: Masami Hiramatsu <mhiramat@...hat.com>
> 
> Thank you,
> 

Ingo, could you take this in x86.git?

Harvey


From: Harvey Harrison <harvey.harrison@...il.com>
Subject: [PATCH] kprobes: remove sparse warnings from x86

arch/x86/kernel/kprobes.c:584:16: warning: symbol 'kretprobe_trampoline_holder' was not declared. Should it be static?
arch/x86/kernel/kprobes.c:676:6: warning: symbol 'trampoline_handler' was not declared. Should it be static?

Make them static and add the __used attribute, approach taken from the
arm kprobes implementation.

kretprobe_trampoline_holder uses inline assemly to define the global
symbol kretprobe_trampoline, but nothing ever calls the holder explicitly.

trampoline handler is only called from inline assembly in the same file,
mark it used and static.

Acked-by: Masami Hiramatsu <mhiramat@...hat.com>
Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
 arch/x86/kernel/kprobes.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c
index a99e764..34a5912 100644
--- a/arch/x86/kernel/kprobes.c
+++ b/arch/x86/kernel/kprobes.c
@@ -581,7 +581,7 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
  * When a retprobed function returns, this code saves registers and
  * calls trampoline_handler() runs, which calls the kretprobe's handler.
  */
-void __kprobes kretprobe_trampoline_holder(void)
+static void __used __kprobes kretprobe_trampoline_holder(void)
 {
 	asm volatile (
 			".global kretprobe_trampoline\n"
@@ -673,7 +673,7 @@ void __kprobes kretprobe_trampoline_holder(void)
 /*
  * Called from kretprobe_trampoline
  */
-void * __kprobes trampoline_handler(struct pt_regs *regs)
+static __used __kprobes void *trampoline_handler(struct pt_regs *regs)
 {
 	struct kretprobe_instance *ri = NULL;
 	struct hlist_head *head, empty_rp;
-- 
1.5.4.1.1278.gc75be



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