* [PATCH 09/17] tools/sched_ext: Add struct_size() helpers to common.bpf.h
@ 2026-04-24 1:32 Tejun Heo
0 siblings, 0 replies; 4+ messages in thread
From: Tejun Heo @ 2026-04-24 1:32 UTC (permalink / raw)
To: David Vernet, Andrea Righi, Changwoo Min
Cc: sched-ext, emil, linux-kernel, Cheng-Yang Chou, Zhao Mengmeng,
Tejun Heo
Add flex_array_size(), struct_size() and struct_size_t() to
scx/common.bpf.h so BPF schedulers can size flex-array-containing
structs the same way kernel code does. These are abbreviated forms of
the <linux/overflow.h> macros.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Cheng-Yang Chou <yphbchou0911@gmail.com>
---
tools/sched_ext/include/scx/common.bpf.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/tools/sched_ext/include/scx/common.bpf.h b/tools/sched_ext/include/scx/common.bpf.h
index 18f823d424cc..4bf959a8cd08 100644
--- a/tools/sched_ext/include/scx/common.bpf.h
+++ b/tools/sched_ext/include/scx/common.bpf.h
@@ -1043,6 +1043,16 @@ static inline u64 scx_clock_irq(u32 cpu)
return irqt ? BPF_CORE_READ(irqt, total) : 0;
}
+/* Abbreviated forms of <linux/overflow.h>'s struct_size() family. */
+#define flex_array_size(p, member, count) \
+ ((count) * sizeof(*(p)->member))
+
+#define struct_size(p, member, count) \
+ (sizeof(*(p)) + flex_array_size(p, member, count))
+
+#define struct_size_t(type, member, count) \
+ struct_size((type *)NULL, member, count)
+
#include "compat.bpf.h"
#include "enums.bpf.h"
--
2.53.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 09/17] tools/sched_ext: Add struct_size() helpers to common.bpf.h
2026-04-24 17:27 [PATCHSET v2 REPOST sched_ext/for-7.2] sched_ext: Topological CPU IDs and cid-form struct_ops Tejun Heo
@ 2026-04-24 17:27 ` Tejun Heo
0 siblings, 0 replies; 4+ messages in thread
From: Tejun Heo @ 2026-04-24 17:27 UTC (permalink / raw)
To: David Vernet, Andrea Righi, Changwoo Min
Cc: sched-ext, emil, linux-kernel, Cheng-Yang Chou, Zhao Mengmeng,
Tejun Heo
Add flex_array_size(), struct_size() and struct_size_t() to
scx/common.bpf.h so BPF schedulers can size flex-array-containing
structs the same way kernel code does. These are abbreviated forms of
the <linux/overflow.h> macros.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Cheng-Yang Chou <yphbchou0911@gmail.com>
---
tools/sched_ext/include/scx/common.bpf.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/tools/sched_ext/include/scx/common.bpf.h b/tools/sched_ext/include/scx/common.bpf.h
index 18f823d424cc..4bf959a8cd08 100644
--- a/tools/sched_ext/include/scx/common.bpf.h
+++ b/tools/sched_ext/include/scx/common.bpf.h
@@ -1043,6 +1043,16 @@ static inline u64 scx_clock_irq(u32 cpu)
return irqt ? BPF_CORE_READ(irqt, total) : 0;
}
+/* Abbreviated forms of <linux/overflow.h>'s struct_size() family. */
+#define flex_array_size(p, member, count) \
+ ((count) * sizeof(*(p)->member))
+
+#define struct_size(p, member, count) \
+ (sizeof(*(p)) + flex_array_size(p, member, count))
+
+#define struct_size_t(type, member, count) \
+ struct_size((type *)NULL, member, count)
+
#include "compat.bpf.h"
#include "enums.bpf.h"
--
2.53.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 09/17] tools/sched_ext: Add struct_size() helpers to common.bpf.h
2026-04-28 20:35 [PATCHSET v3 sched_ext/for-7.2] sched_ext: Topological CPU IDs and cid-form struct_ops Tejun Heo
@ 2026-04-28 20:35 ` Tejun Heo
0 siblings, 0 replies; 4+ messages in thread
From: Tejun Heo @ 2026-04-28 20:35 UTC (permalink / raw)
To: David Vernet, Andrea Righi, Changwoo Min
Cc: sched-ext, Emil Tsalapatis, linux-kernel, Tejun Heo,
Cheng-Yang Chou
Add flex_array_size(), struct_size() and struct_size_t() to
scx/common.bpf.h so BPF schedulers can size flex-array-containing
structs the same way kernel code does. These are abbreviated forms of
the <linux/overflow.h> macros.
v3: Use offsetof() instead of sizeof() in struct_size() to match kernel
semantics (no inflation from trailing struct padding). (Sashiko)
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Cheng-Yang Chou <yphbchou0911@gmail.com>
---
tools/sched_ext/include/scx/common.bpf.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/tools/sched_ext/include/scx/common.bpf.h b/tools/sched_ext/include/scx/common.bpf.h
index 18f823d424cc..087ae4f79c60 100644
--- a/tools/sched_ext/include/scx/common.bpf.h
+++ b/tools/sched_ext/include/scx/common.bpf.h
@@ -1043,6 +1043,16 @@ static inline u64 scx_clock_irq(u32 cpu)
return irqt ? BPF_CORE_READ(irqt, total) : 0;
}
+/* Abbreviated forms of <linux/overflow.h>'s struct_size() family. */
+#define flex_array_size(p, member, count) \
+ ((count) * sizeof(*(p)->member))
+
+#define struct_size(p, member, count) \
+ (offsetof(typeof(*(p)), member) + flex_array_size(p, member, count))
+
+#define struct_size_t(type, member, count) \
+ struct_size((type *)NULL, member, count)
+
#include "compat.bpf.h"
#include "enums.bpf.h"
--
2.54.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 09/17] tools/sched_ext: Add struct_size() helpers to common.bpf.h
2026-04-29 18:21 [PATCHSET v4 sched_ext/for-7.2] sched_ext: Topological CPU IDs and cid-form struct_ops Tejun Heo
@ 2026-04-29 18:21 ` Tejun Heo
0 siblings, 0 replies; 4+ messages in thread
From: Tejun Heo @ 2026-04-29 18:21 UTC (permalink / raw)
To: David Vernet, Andrea Righi, Changwoo Min
Cc: Emil Tsalapatis, sched-ext, linux-kernel, Tejun Heo,
Cheng-Yang Chou
Add flex_array_size(), struct_size() and struct_size_t() to
scx/common.bpf.h so BPF schedulers can size flex-array-containing
structs the same way kernel code does. These are abbreviated forms of
the <linux/overflow.h> macros.
v3: Use offsetof() instead of sizeof() in struct_size() to match kernel
semantics (no inflation from trailing struct padding). (Sashiko)
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Cheng-Yang Chou <yphbchou0911@gmail.com>
Reviewed-by: Changwoo Min <changwoo@igalia.com>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
---
tools/sched_ext/include/scx/common.bpf.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/tools/sched_ext/include/scx/common.bpf.h b/tools/sched_ext/include/scx/common.bpf.h
index 18f823d424cc..087ae4f79c60 100644
--- a/tools/sched_ext/include/scx/common.bpf.h
+++ b/tools/sched_ext/include/scx/common.bpf.h
@@ -1043,6 +1043,16 @@ static inline u64 scx_clock_irq(u32 cpu)
return irqt ? BPF_CORE_READ(irqt, total) : 0;
}
+/* Abbreviated forms of <linux/overflow.h>'s struct_size() family. */
+#define flex_array_size(p, member, count) \
+ ((count) * sizeof(*(p)->member))
+
+#define struct_size(p, member, count) \
+ (offsetof(typeof(*(p)), member) + flex_array_size(p, member, count))
+
+#define struct_size_t(type, member, count) \
+ struct_size((type *)NULL, member, count)
+
#include "compat.bpf.h"
#include "enums.bpf.h"
--
2.54.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
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2026-04-24 17:27 ` [PATCH 09/17] tools/sched_ext: Add struct_size() helpers to common.bpf.h Tejun Heo
2026-04-28 20:35 [PATCHSET v3 sched_ext/for-7.2] sched_ext: Topological CPU IDs and cid-form struct_ops Tejun Heo
2026-04-28 20:35 ` [PATCH 09/17] tools/sched_ext: Add struct_size() helpers to common.bpf.h Tejun Heo
2026-04-29 18:21 [PATCHSET v4 sched_ext/for-7.2] sched_ext: Topological CPU IDs and cid-form struct_ops Tejun Heo
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