linux-kernel - [PATCH 1/6] hw_breakpoint: Pass bp_type directly as find_slot

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Date:   Mon, 27 Nov 2017 17:21:28 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Milind Chabbi <chabbi.milind@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Hari Bathini <hbathini@...ux.vnet.ibm.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...el.com>,
        Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
        Oleg Nesterov <onestero@...hat.com>,
        Will Deacon <will.deacon@....com>
Subject: [PATCH 1/6] hw_breakpoint: Pass bp_type directly as find_slot_idx argument

Passing bp_type directly as find_slot_idx argument,
so we don't need to have whole event to get the
breakpoint slot type. It will be used in following
changes.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 kernel/events/hw_breakpoint.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
index 3f8cb1e14588..395ca07965af 100644
--- a/kernel/events/hw_breakpoint.c
+++ b/kernel/events/hw_breakpoint.c
@@ -85,9 +85,9 @@ __weak int hw_breakpoint_weight(struct perf_event *bp)
 	return 1;
 }
 
-static inline enum bp_type_idx find_slot_idx(struct perf_event *bp)
+static inline enum bp_type_idx find_slot_idx(u64 bp_type)
 {
-	if (bp->attr.bp_type & HW_BREAKPOINT_RW)
+	if (bp_type & HW_BREAKPOINT_RW)
 		return TYPE_DATA;
 
 	return TYPE_INST;
@@ -122,7 +122,7 @@ static int task_bp_pinned(int cpu, struct perf_event *bp, enum bp_type_idx type)
 
 	list_for_each_entry(iter, &bp_task_head, hw.bp_list) {
 		if (iter->hw.target == tsk &&
-		    find_slot_idx(iter) == type &&
+		    find_slot_idx(iter->attr.bp_type) == type &&
 		    (iter->cpu < 0 || cpu == iter->cpu))
 			count += hw_breakpoint_weight(iter);
 	}
@@ -292,7 +292,7 @@ static int __reserve_bp_slot(struct perf_event *bp)
 	    bp->attr.bp_type == HW_BREAKPOINT_INVALID)
 		return -EINVAL;
 
-	type = find_slot_idx(bp);
+	type = find_slot_idx(bp->attr.bp_type);
 	weight = hw_breakpoint_weight(bp);
 
 	fetch_bp_busy_slots(&slots, bp, type);
@@ -329,7 +329,7 @@ static void __release_bp_slot(struct perf_event *bp)
 	enum bp_type_idx type;
 	int weight;
 
-	type = find_slot_idx(bp);
+	type = find_slot_idx(bp->attr.bp_type);
 	weight = hw_breakpoint_weight(bp);
 	toggle_bp_slot(bp, false, type, weight);
 }
-- 
2.13.6