disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/kernel/events/hw_breakpoint.c
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@@ -1,18 +1,5 @@
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+// SPDX-License-Identifier: GPL-2.0+
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 /*
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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- *
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  * Copyright (C) 2007 Alan Stern
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  * Copyright (C) IBM Corporation, 2009
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  * Copyright (C) 2009, Frederic Weisbecker <fweisbec@gmail.com>
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@@ -226,6 +213,15 @@
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 		list_del(&bp->hw.bp_list);
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 }
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+__weak int arch_reserve_bp_slot(struct perf_event *bp)
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+{
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+	return 0;
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+}
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+
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+__weak void arch_release_bp_slot(struct perf_event *bp)
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+{
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+}
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+
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 /*
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  * Function to perform processor-specific cleanup during unregistration
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  */
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@@ -238,7 +234,7 @@
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 }
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 /*
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- * Contraints to check before allowing this new breakpoint counter:
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+ * Constraints to check before allowing this new breakpoint counter:
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  *
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  *  == Non-pinned counter == (Considered as pinned for now)
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  *
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@@ -283,6 +279,7 @@
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 	struct bp_busy_slots slots = {0};
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 	enum bp_type_idx type;
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 	int weight;
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+	int ret;
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 	/* We couldn't initialize breakpoint constraints on boot */
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 	if (!constraints_initialized)
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@@ -307,6 +304,10 @@
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 	if (slots.pinned + (!!slots.flexible) > nr_slots[type])
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 		return -ENOSPC;
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+	ret = arch_reserve_bp_slot(bp);
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+	if (ret)
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+		return ret;
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+
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 	toggle_bp_slot(bp, true, type, weight);
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 	return 0;
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@@ -330,6 +331,8 @@
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 	enum bp_type_idx type;
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 	int weight;
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+	arch_release_bp_slot(bp);
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+
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 	type = find_slot_idx(bp_type);
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 	weight = hw_breakpoint_weight(bp);
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 	toggle_bp_slot(bp, false, type, weight);