linux-kernel - [tip:perf/core] hw_breakpoint: Factor out __modify_user_hw

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Message-ID: <tip-18ff57b220610a699947f20b156a8245ca7eee98@git.kernel.org>
Date:   Mon, 12 Mar 2018 23:20:19 -0700
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, yao.jin@...ux.intel.com, sukadev@...ux.vnet.ibm.com,
        mingo@...nel.org, tglx@...utronix.de, chabbi.milind@...il.com,
        mpe@...erman.id.au, dsahern@...il.com, kan.liang@...el.com,
        fweisbec@...il.com, jolsa@...hat.com, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, jolsa@...nel.org,
        onestero@...hat.com, acme@...hat.com, hbathini@...ux.vnet.ibm.com,
        peterz@...radead.org, will.deacon@....com,
        alexander.shishkin@...ux.intel.com, namhyung@...nel.org
Subject: [tip:perf/core] hw_breakpoint: Factor out
 __modify_user_hw_breakpoint() function

Commit-ID:  18ff57b220610a699947f20b156a8245ca7eee98
Gitweb:     https://git.kernel.org/tip/18ff57b220610a699947f20b156a8245ca7eee98
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Mon, 12 Mar 2018 14:45:44 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 13 Mar 2018 06:56:08 +0100

hw_breakpoint: Factor out __modify_user_hw_breakpoint() function

Moving out all the functionality without the events
disabling/enabling calls, because we want to call another
disabling/enabling functions in following change.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Hari Bathini <hbathini@...ux.vnet.ibm.com>
Cc: Jin Yao <yao.jin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Milind Chabbi <chabbi.milind@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Oleg Nesterov <onestero@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Deacon <will.deacon@....com>
Link: http://lkml.kernel.org/r/20180312134548.31532-5-jolsa@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/events/hw_breakpoint.c | 46 +++++++++++++++++++++++++++----------------
 1 file changed, 29 insertions(+), 17 deletions(-)

diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
index 776948beb4ac..a556aba223da 100644
--- a/kernel/events/hw_breakpoint.c
+++ b/kernel/events/hw_breakpoint.c
@@ -456,6 +456,33 @@ register_user_hw_breakpoint(struct perf_event_attr *attr,
 }
 EXPORT_SYMBOL_GPL(register_user_hw_breakpoint);
 
+static int __modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr)
+{
+	u64 old_addr = bp->attr.bp_addr;
+	u64 old_len  = bp->attr.bp_len;
+	int old_type = bp->attr.bp_type;
+	bool modify  = attr->bp_type != old_type;
+	int err = 0;
+
+	bp->attr.bp_addr = attr->bp_addr;
+	bp->attr.bp_type = attr->bp_type;
+	bp->attr.bp_len  = attr->bp_len;
+
+	err = validate_hw_breakpoint(bp);
+	if (!err && modify)
+		err = modify_bp_slot(bp, old_type);
+
+	if (err) {
+		bp->attr.bp_addr = old_addr;
+		bp->attr.bp_type = old_type;
+		bp->attr.bp_len  = old_len;
+		return err;
+	}
+
+	bp->attr.disabled = attr->disabled;
+	return 0;
+}
+
 /**
  * modify_user_hw_breakpoint - modify a user-space hardware breakpoint
  * @bp: the breakpoint structure to modify
@@ -465,11 +492,7 @@ EXPORT_SYMBOL_GPL(register_user_hw_breakpoint);
  */
 int modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr)
 {
-	u64 old_addr = bp->attr.bp_addr;
-	u64 old_len = bp->attr.bp_len;
-	int old_type = bp->attr.bp_type;
-	bool modify = attr->bp_type != old_type;
-	int err = 0;
+	int err;
 
 	/*
 	 * modify_user_hw_breakpoint can be invoked with IRQs disabled and hence it
@@ -482,18 +505,9 @@ int modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *att
 	else
 		perf_event_disable(bp);
 
-	bp->attr.bp_addr = attr->bp_addr;
-	bp->attr.bp_type = attr->bp_type;
-	bp->attr.bp_len = attr->bp_len;
-
-	err = validate_hw_breakpoint(bp);
-	if (!err && modify)
-		err = modify_bp_slot(bp, old_type);
+	err = __modify_user_hw_breakpoint(bp, attr);
 
 	if (err) {
-		bp->attr.bp_addr = old_addr;
-		bp->attr.bp_type = old_type;
-		bp->attr.bp_len = old_len;
 		if (!bp->attr.disabled)
 			perf_event_enable(bp);
 
@@ -502,8 +516,6 @@ int modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *att
 
 	if (!attr->disabled)
 		perf_event_enable(bp);
-
-	bp->attr.disabled = attr->disabled;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(modify_user_hw_breakpoint);