linux-kernel - [PATCH v3] sched_ext: fix application of sizeof to pointer

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Message-Id: <20241117025129.159014-1-guanjing@cmss.chinamobile.com>
Date: Sun, 17 Nov 2024 10:51:29 +0800
From: guanjing <guanjing@...s.chinamobile.com>
To: tj@...nel.org,
	void@...ifault.com,
	joshdon@...gle.com,
	haoluo@...gle.com,
	brho@...gle.com
Cc: linux-kernel@...r.kernel.org,
	guanjing <guanjing@...s.chinamobile.com>
Subject: [PATCH v3] sched_ext: fix application of sizeof to pointer

sizeof when applied to a pointer typed expression gives the size of
the pointer.

The proper fix in this particular case is to code sizeof(*cpuset)
instead of sizeof(cpuset).

This issue was detected with the help of Coccinelle.

Fixes: 22a920209ab6 ("sched_ext: Implement tickless support")
Signed-off-by: guanjing <guanjing@...s.chinamobile.com>
---
 tools/sched_ext/scx_central.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/sched_ext/scx_central.c b/tools/sched_ext/scx_central.c
index 21deea320bd7..e938156ed0a0 100644
--- a/tools/sched_ext/scx_central.c
+++ b/tools/sched_ext/scx_central.c
@@ -97,7 +97,7 @@ int main(int argc, char **argv)
 	SCX_BUG_ON(!cpuset, "Failed to allocate cpuset");
 	CPU_ZERO(cpuset);
 	CPU_SET(skel->rodata->central_cpu, cpuset);
-	SCX_BUG_ON(sched_setaffinity(0, sizeof(cpuset), cpuset),
+	SCX_BUG_ON(sched_setaffinity(0, sizeof(*cpuset), cpuset),
 		   "Failed to affinitize to central CPU %d (max %d)",
 		   skel->rodata->central_cpu, skel->rodata->nr_cpu_ids - 1);
 	CPU_FREE(cpuset);
-- 
2.33.0