linux-kernel - [PATCH 1/3] perf/core: Assert PERF_EVENT_FLAG_ARCH does not overlap with generic flags

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Message-Id: <20220829065507.177781-2-anshuman.khandual@arm.com>
Date:   Mon, 29 Aug 2022 12:25:05 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        peterz@...radead.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH 1/3] perf/core: Assert PERF_EVENT_FLAG_ARCH does not overlap with generic flags

This just ensures that PERF_EVENT_FLAG_ARCH does not overlap with generic
hardware event flags.

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: linux-perf-users@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 kernel/events/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 2621fd24ad26..29c58de6c888 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -13429,6 +13429,7 @@ void __init perf_event_init(void)
 	 */
 	BUILD_BUG_ON((offsetof(struct perf_event_mmap_page, data_head))
 		     != 1024);
+	BUILD_BUG_ON(PERF_EVENT_FLAG_USER_READ_CNT & PERF_EVENT_FLAG_ARCH);
 }
 
 ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
-- 
2.25.1