linux-kernel - [RFC PATCH] tools/sched_ext: Use u64 for kind field to fix ARM64 atomic ops

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Message-ID: <20260209085536.16723-1-xuewen.yan@unisoc.com>
Date: Mon, 9 Feb 2026 16:55:36 +0800
From: Xuewen Yan <xuewen.yan@...soc.com>
To: <tj@...nel.org>, <void@...ifault.com>, <arighi@...dia.com>,
        <changwoo@...lia.com>, <guohua.yan@...soc.com>
CC: <ke.wang@...soc.com>, <di.shen@...soc.com>, <sched-ext@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
        <xuewen.yan94@...il.com>
Subject: [RFC PATCH] tools/sched_ext: Use u64 for kind field to fix ARM64 atomic ops

From: Guohua Yan <guohua.yan@...soc.com>

There are following compile errors in arm64:

bpftools/CORE/scx_simple.bpf.c:144:2: error: unsupported atomic operation, please use 64 bit version
  144 |         UEI_RECORD(uei, ei);
      |         ^

Convert kind from int to u64 to resolve ARM64 atomic operation
limitations. ARM64 primarily supports 64-bit atomic operations.

Signed-off-by: Guohua Yan <guohua.yan@...soc.com>
Signed-off-by: Xuewen Yan <xuewen.yan@...soc.com>
---
 tools/sched_ext/include/scx/user_exit_info_common.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/sched_ext/include/scx/user_exit_info_common.h b/tools/sched_ext/include/scx/user_exit_info_common.h
index 2d0981aedd89..5bad20faade1 100644
--- a/tools/sched_ext/include/scx/user_exit_info_common.h
+++ b/tools/sched_ext/include/scx/user_exit_info_common.h
@@ -21,7 +21,7 @@ enum uei_sizes {
 };
 
 struct user_exit_info {
-	int		kind;
+	u64		kind;
 	s64		exit_code;
 	char		reason[UEI_REASON_LEN];
 	char		msg[UEI_MSG_LEN];
-- 
2.25.1