linux-kernel - [PATCH] Tracepoints use TABLE

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Date:	Thu, 24 Jul 2008 16:37:23 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Hideo AOKI <haoki@...hat.com>,
	Takashi Nishiie <t-nishiie@...css.fujitsu.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Subject: [PATCH] Tracepoints use TABLE_SIZE macro

Steven Rostedt <rostedt@...dmis.org> :

Wouldn't it look nicer to have: (TRACEPOINT_TABLE_SIZE - 1) ?

me :

Sure,

It applies on top of the "Tracepoints" patch, currently in the ftrace
tree.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC: Steven Rostedt <rostedt@...dmis.org>
CC: akpm@...ux-foundation.org
CC: Ingo Molnar <mingo@...e.hu>
CC: Peter Zijlstra <peterz@...radead.org>
CC: Masami Hiramatsu <mhiramat@...hat.com>
CC: "Frank Ch. Eigler" <fche@...hat.com>
CC: Hideo AOKI <haoki@...hat.com>
CC: Takashi Nishiie <t-nishiie@...css.fujitsu.com>
CC: Alexander Viro <viro@...iv.linux.org.uk>
CC: Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
---
 kernel/tracepoint.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: linux-2.6-lttng/kernel/tracepoint.c
===================================================================
--- linux-2.6-lttng.orig/kernel/tracepoint.c	2008-07-24 16:33:52.000000000 -0400
+++ linux-2.6-lttng/kernel/tracepoint.c	2008-07-24 16:34:57.000000000 -0400
@@ -177,7 +177,7 @@ static struct tracepoint_entry *get_trac
 	struct tracepoint_entry *e;
 	u32 hash = jhash(name, strlen(name), 0);
 
-	head = &tracepoint_table[hash & ((1 << TRACEPOINT_HASH_BITS)-1)];
+	head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)];
 	hlist_for_each_entry(e, node, head, hlist) {
 		if (!strcmp(name, e->name))
 			return e;
@@ -197,7 +197,7 @@ static struct tracepoint_entry *add_trac
 	size_t name_len = strlen(name) + 1;
 	u32 hash = jhash(name, name_len-1, 0);
 
-	head = &tracepoint_table[hash & ((1 << TRACEPOINT_HASH_BITS)-1)];
+	head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)];
 	hlist_for_each_entry(e, node, head, hlist) {
 		if (!strcmp(name, e->name)) {
 			printk(KERN_NOTICE
@@ -233,7 +233,7 @@ static int remove_tracepoint(const char 
 	size_t len = strlen(name) + 1;
 	u32 hash = jhash(name, len-1, 0);
 
-	head = &tracepoint_table[hash & ((1 << TRACEPOINT_HASH_BITS)-1)];
+	head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)];
 	hlist_for_each_entry(e, node, head, hlist) {
 		if (!strcmp(name, e->name)) {
 			found = 1;
-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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