linux-kernel - [PATCH 2/6] hw_breakpoint: Pass bp_type argument to __reserve_bp_slot|__release_bp

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Date:   Mon, 27 Nov 2017 17:21:29 +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 2/6] hw_breakpoint: Pass bp_type argument to __reserve_bp_slot|__release_bp_slot

Passing bp_type argument to __reserve_bp_slot and __release_bp_slot
functions, so we can pass another bp_type than the one defined in
bp->attr.bp_type. This will be handy in following change that fixes
breakpoint slot counts during its modification.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 kernel/events/hw_breakpoint.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
index 395ca07965af..9b31fbcc3305 100644
--- a/kernel/events/hw_breakpoint.c
+++ b/kernel/events/hw_breakpoint.c
@@ -277,7 +277,7 @@ __weak void arch_unregister_hw_breakpoint(struct perf_event *bp)
  *       ((per_cpu(info->flexible, *) > 1) + max(per_cpu(info->cpu_pinned, *))
  *            + max(per_cpu(info->tsk_pinned, *))) < HBP_NUM
  */
-static int __reserve_bp_slot(struct perf_event *bp)
+static int __reserve_bp_slot(struct perf_event *bp, u64 bp_type)
 {
 	struct bp_busy_slots slots = {0};
 	enum bp_type_idx type;
@@ -288,11 +288,11 @@ static int __reserve_bp_slot(struct perf_event *bp)
 		return -ENOMEM;
 
 	/* Basic checks */
-	if (bp->attr.bp_type == HW_BREAKPOINT_EMPTY ||
-	    bp->attr.bp_type == HW_BREAKPOINT_INVALID)
+	if (bp_type == HW_BREAKPOINT_EMPTY ||
+	    bp_type == HW_BREAKPOINT_INVALID)
 		return -EINVAL;
 
-	type = find_slot_idx(bp->attr.bp_type);
+	type = find_slot_idx(bp_type);
 	weight = hw_breakpoint_weight(bp);
 
 	fetch_bp_busy_slots(&slots, bp, type);
@@ -317,19 +317,19 @@ int reserve_bp_slot(struct perf_event *bp)
 
 	mutex_lock(&nr_bp_mutex);
 
-	ret = __reserve_bp_slot(bp);
+	ret = __reserve_bp_slot(bp, bp->attr.bp_type);
 
 	mutex_unlock(&nr_bp_mutex);
 
 	return ret;
 }
 
-static void __release_bp_slot(struct perf_event *bp)
+static void __release_bp_slot(struct perf_event *bp, u64 bp_type)
 {
 	enum bp_type_idx type;
 	int weight;
 
-	type = find_slot_idx(bp->attr.bp_type);
+	type = find_slot_idx(bp_type);
 	weight = hw_breakpoint_weight(bp);
 	toggle_bp_slot(bp, false, type, weight);
 }
@@ -339,7 +339,7 @@ void release_bp_slot(struct perf_event *bp)
 	mutex_lock(&nr_bp_mutex);
 
 	arch_unregister_hw_breakpoint(bp);
-	__release_bp_slot(bp);
+	__release_bp_slot(bp, bp->attr.bp_type);
 
 	mutex_unlock(&nr_bp_mutex);
 }
@@ -354,7 +354,7 @@ int dbg_reserve_bp_slot(struct perf_event *bp)
 	if (mutex_is_locked(&nr_bp_mutex))
 		return -1;
 
-	return __reserve_bp_slot(bp);
+	return __reserve_bp_slot(bp, bp->attr.bp_type);
 }
 
 int dbg_release_bp_slot(struct perf_event *bp)
@@ -362,7 +362,7 @@ int dbg_release_bp_slot(struct perf_event *bp)
 	if (mutex_is_locked(&nr_bp_mutex))
 		return -1;
 
-	__release_bp_slot(bp);
+	__release_bp_slot(bp, bp->attr.bp_type);
 
 	return 0;
 }
-- 
2.13.6