linux-kernel - [tip:perf/urgent] kprobes: Make hash

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Date:	Mon, 18 Mar 2013 04:10:18 -0700
From:	tip-bot for Masami Hiramatsu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, xemul@...allels.com,
	jkosina@...e.cz, davem@...emloft.net, nyc@...omorphy.com,
	ananth@...ibm.com, masami.hiramatsu.pt@...achi.com,
	tglx@...utronix.de, timo.lindfors@....fi
Subject: [tip:perf/urgent] kprobes: Make hash_64() as always inlined

Commit-ID:  65c10553552b487a71bf5e4676743435046fae6f
Gitweb:     http://git.kernel.org/tip/65c10553552b487a71bf5e4676743435046fae6f
Author:     Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
AuthorDate: Thu, 14 Mar 2013 20:52:30 +0900
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 18 Mar 2013 10:21:23 +0100

kprobes: Make hash_64() as always inlined

Because hash_64() is called from the get_kprobe() inside
int3 handler, kernel causes int3 recursion and crashes if
kprobes user puts a probe on it.

Usually hash_64() is inlined into caller function, but in
some cases, it has instances by gcc's interprocedural
constant propagation.

This patch uses __always_inline instead of inline to
prevent gcc from doing such things.

Reported-by: Timo Juhani Lindfors <timo.lindfors@....fi>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc: Pavel Emelyanov <xemul@...allels.com>
Cc: Jiri Kosina <jkosina@...e.cz>
Cc: Nadia Yvette Chambers <nyc@...omorphy.com>
Cc: yrl.pp-manager.tt@...achi.com
Cc: David S. Miller <davem@...emloft.net>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/20130314115230.19690.39387.stgit@mhiramat-M0-7522
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/hash.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/hash.h b/include/linux/hash.h
index 61c97ae..f09a0ae 100644
--- a/include/linux/hash.h
+++ b/include/linux/hash.h
@@ -15,6 +15,7 @@
  */
 
 #include <asm/types.h>
+#include <linux/compiler.h>
 
 /* 2^31 + 2^29 - 2^25 + 2^22 - 2^19 - 2^16 + 1 */
 #define GOLDEN_RATIO_PRIME_32 0x9e370001UL
@@ -31,7 +32,7 @@
 #error Wordsize not 32 or 64
 #endif
 
-static inline u64 hash_64(u64 val, unsigned int bits)
+static __always_inline u64 hash_64(u64 val, unsigned int bits)
 {
 	u64 hash = val;
 
--
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