* [RFC PATCH] tools/sched_ext: Use u64 for kind field to fix ARM64 atomic ops
@ 2026-02-09 8:55 Xuewen Yan
2026-02-09 19:11 ` Tejun Heo
0 siblings, 1 reply; 3+ messages in thread
From: Xuewen Yan @ 2026-02-09 8:55 UTC (permalink / raw)
To: tj, void, arighi, changwoo, guohua.yan
Cc: ke.wang, di.shen, sched-ext, linux-kernel, bpf, xuewen.yan94
From: Guohua Yan <guohua.yan@unisoc.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@unisoc.com>
Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.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
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [RFC PATCH] tools/sched_ext: Use u64 for kind field to fix ARM64 atomic ops
2026-02-09 8:55 [RFC PATCH] tools/sched_ext: Use u64 for kind field to fix ARM64 atomic ops Xuewen Yan
@ 2026-02-09 19:11 ` Tejun Heo
2026-02-10 1:48 ` Xuewen Yan
0 siblings, 1 reply; 3+ messages in thread
From: Tejun Heo @ 2026-02-09 19:11 UTC (permalink / raw)
To: Xuewen Yan
Cc: void, arighi, changwoo, guohua.yan, ke.wang, di.shen, sched-ext,
linux-kernel, bpf, xuewen.yan94
On Mon, Feb 09, 2026 at 04:55:36PM +0800, Xuewen Yan wrote:
> From: Guohua Yan <guohua.yan@unisoc.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.
Alexei says this is llvm bpf backend error and the answer is to upgrade to a
modern llvm that defaults to -mcpu=v3.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [RFC PATCH] tools/sched_ext: Use u64 for kind field to fix ARM64 atomic ops
2026-02-09 19:11 ` Tejun Heo
@ 2026-02-10 1:48 ` Xuewen Yan
0 siblings, 0 replies; 3+ messages in thread
From: Xuewen Yan @ 2026-02-10 1:48 UTC (permalink / raw)
To: Tejun Heo
Cc: Xuewen Yan, void, arighi, changwoo, guohua.yan, ke.wang, di.shen,
sched-ext, linux-kernel, bpf
On Tue, Feb 10, 2026 at 3:11 AM Tejun Heo <tj@kernel.org> wrote:
>
> On Mon, Feb 09, 2026 at 04:55:36PM +0800, Xuewen Yan wrote:
> > From: Guohua Yan <guohua.yan@unisoc.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.
>
> Alexei says this is llvm bpf backend error and the answer is to upgrade to a
> modern llvm that defaults to -mcpu=v3.
Thank you for the insight. We'll upgrade our LLVM toolchain and test
with -mcpu=v3.
Appreciate your guidance on this backend issue.
Thanks！
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2026-02-10 1:48 UTC | newest]
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2026-02-09 8:55 [RFC PATCH] tools/sched_ext: Use u64 for kind field to fix ARM64 atomic ops Xuewen Yan
2026-02-09 19:11 ` Tejun Heo
2026-02-10 1:48 ` Xuewen Yan
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