linux-kernel - [tip:perf/urgent] kprobes: Simplify register

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Date:   Sat, 8 Jul 2017 04:10:30 -0700
From:   "tip-bot for Naveen N. Rao" <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, ananth@...ux.vnet.ibm.com, peterz@...radead.org,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        mhiramat@...nel.org, naveen.n.rao@...ux.vnet.ibm.com,
        tglx@...utronix.de, hpa@...or.com
Subject: [tip:perf/urgent] kprobes: Simplify register_jprobes()

Commit-ID:  0f73ff80b751b39ff539a550e65c5bd131ff0316
Gitweb:     http://git.kernel.org/tip/0f73ff80b751b39ff539a550e65c5bd131ff0316
Author:     Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
AuthorDate: Fri, 7 Jul 2017 22:37:25 +0530
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sat, 8 Jul 2017 11:05:34 +0200

kprobes: Simplify register_jprobes()

Re-factor jprobe registration functions as the current version is
getting too unwieldy. Move the actual jprobe registration to
register_jprobe() and re-organize code accordingly.

Suggested-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/089cae4bfe73767f765291ee0e6fb0c3d240e5f1.1499443367.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/kprobes.c | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index a519219..db3cd3e 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1771,24 +1771,13 @@ unsigned long __weak arch_deref_entry_point(void *entry)
 
 int register_jprobes(struct jprobe **jps, int num)
 {
-	struct jprobe *jp;
 	int ret = 0, i;
 
 	if (num <= 0)
 		return -EINVAL;
+
 	for (i = 0; i < num; i++) {
-		unsigned long addr, offset;
-		jp = jps[i];
-		addr = arch_deref_entry_point(jp->entry);
-
-		/* Verify probepoint is a function entry point */
-		if (kallsyms_lookup_size_offset(addr, NULL, &offset) &&
-		    offset == 0) {
-			jp->kp.pre_handler = setjmp_pre_handler;
-			jp->kp.break_handler = longjmp_break_handler;
-			ret = register_kprobe(&jp->kp);
-		} else
-			ret = -EINVAL;
+		ret = register_jprobe(jps[i]);
 
 		if (ret < 0) {
 			if (i > 0)
@@ -1796,13 +1785,26 @@ int register_jprobes(struct jprobe **jps, int num)
 			break;
 		}
 	}
+
 	return ret;
 }
 EXPORT_SYMBOL_GPL(register_jprobes);
 
 int register_jprobe(struct jprobe *jp)
 {
-	return register_jprobes(&jp, 1);
+	unsigned long addr, offset;
+	struct kprobe *kp = &jp->kp;
+
+	/* Verify probepoint is a function entry point */
+	addr = arch_deref_entry_point(jp->entry);
+
+	if (kallsyms_lookup_size_offset(addr, NULL, &offset) && offset == 0) {
+		kp->pre_handler = setjmp_pre_handler;
+		kp->break_handler = longjmp_break_handler;
+		return register_kprobe(kp);
+	}
+
+	return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(register_jprobe);