From: Yury Norov <ynorov@nvidia.com>
To: linux-kernel@vger.kernel.org,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Jakub Kicinski <kuba@kernel.org>
Cc: Yury Norov <ynorov@nvidia.com>, Al Viro <viro@zeniv.linux.org.uk>,
David Laight <david.laight.linux@gmail.com>,
Ben Horgan <ben.horgan@arm.com>,
Johannes Berg <johannes@sipsolutions.net>,
Nicolas Frattaroli <nicolas.frattaroli@collabora.com>,
Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>,
Fuad Tabba <fuad.tabba@linux.dev>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Yury Norov <yury.norov@gmail.com>
Subject: [PATCH] bitfield: get rid of __MAKE_OP machinery
Date: Mon, 14 Sep 2026 16:49:29 -0400 [thread overview]
Message-ID: <20260914204929.240310-1-ynorov@nvidia.com> (raw)
The __MAKE_OP machinery hides the fixed-width bitfield helper definitions
from source searches and makes the end result highly obscured and largely
uncontrolled.
This follows earlier discussions about making these helpers easier to
find: [1], [2].
Move the explicit helpers and their shared checks into
linux/bitfield-fix-width.h in both the kernel and tools headers, and
include it from bitfield.h to preserve existing users.
The repeated overflow check is factored into __assert_field(), preserving
the original condition and compile-time diagnostics.
With GCC 15.2.0 and x86-64 defconfig plus the bitfield KUnit tests, the
before/after kernel builds are binary identical.
The __MAKE_OP generates the following 40 functions (including the direct
____MAKE_OP(u8,u8,,) invocation):
u8_encode_bits()
u8_replace_bits()
u8p_replace_bits()
u8_get_bits()
le16_encode_bits()
le16_replace_bits() [dead code]
le16p_replace_bits()
le16_get_bits()
be16_encode_bits()
be16_replace_bits() [dead code]
be16p_replace_bits() [dead code]
be16_get_bits()
u16_encode_bits()
u16_replace_bits()
u16p_replace_bits()
u16_get_bits()
le32_encode_bits()
le32_replace_bits() [dead code]
le32p_replace_bits()
le32_get_bits()
be32_encode_bits()
be32_replace_bits() [dead code]
be32p_replace_bits()
be32_get_bits()
u32_encode_bits()
u32_replace_bits()
u32p_replace_bits()
u32_get_bits()
le64_encode_bits()
le64_replace_bits() [dead code]
le64p_replace_bits() [dead code]
le64_get_bits()
be64_encode_bits()
be64_replace_bits() [dead code]
be64p_replace_bits() [dead code]
be64_get_bits()
u64_encode_bits()
u64_replace_bits()
u64p_replace_bits()
u64_get_bits()
Functions marked with [dead code] have no in-tree callers and are
removed by this change.
Link: https://lore.kernel.org/all/20250214073402.0129e259@kernel.org/ [1]
Link: https://lore.kernel.org/all/aeub59FBHbCy-KKP@yury/ [2]
Assisted-by: OpenAI Codex
Signed-off-by: Yury Norov <ynorov@nvidia.com>
---
MAINTAINERS | 2 +
include/linux/bitfield-fix-width.h | 235 ++++++++++++++++++++++++++++++
include/linux/bitfield.h | 49 +------
tools/include/linux/bitfield-fix-width.h | 236 +++++++++++++++++++++++++++++++
tools/include/linux/bitfield.h | 49 +------
5 files changed, 475 insertions(+), 96 deletions(-)
create mode 100644 include/linux/bitfield-fix-width.h
create mode 100644 tools/include/linux/bitfield-fix-width.h
diff --git a/MAINTAINERS b/MAINTAINERS
index be05b0c3684757fa2da3aa1f02265f6e9bfebcb2..03973f947121491a44a5dfd946b3c0649e7a77e2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4638,6 +4638,7 @@ BITMAP API
M: Yury Norov <yury.norov@gmail.com>
R: Rasmus Villemoes <linux@rasmusvillemoes.dk>
S: Maintained
+F: include/linux/bitfield-fix-width.h
F: include/linux/bitfield.h
F: include/linux/bitmap-str.h
F: include/linux/bitmap.h
@@ -4658,6 +4659,7 @@ F: lib/find_bit_benchmark.c
F: lib/region_alloc_benchmark.c
F: lib/test_bitmap.c
F: lib/tests/cpumask_kunit.c
+F: tools/include/linux/bitfield-fix-width.h
F: tools/include/linux/bitfield.h
F: tools/include/linux/bitmap.h
F: tools/include/linux/bits.h
diff --git a/include/linux/bitfield-fix-width.h b/include/linux/bitfield-fix-width.h
new file mode 100644
index 0000000000000000000000000000000000000000..fba86bb76999f1d9a96045dbdddb72f4806a305e
--- /dev/null
+++ b/include/linux/bitfield-fix-width.h
@@ -0,0 +1,235 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _LINUX_BITFIELD_FIX_WIDTH_H
+#define _LINUX_BITFIELD_FIX_WIDTH_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <asm/byteorder.h>
+
+extern void __compiletime_error("value doesn't fit into mask")
+__field_overflow(void);
+
+extern void __compiletime_error("bad bitfield mask")
+__bad_mask(void);
+
+static __always_inline
+u64 field_multiplier(u64 field)
+{
+ if ((field | (field - 1)) & ((field | (field - 1)) + 1))
+ __bad_mask();
+ return field & -field;
+}
+
+static __always_inline
+u64 field_mask(u64 field)
+{
+ return field / field_multiplier(field);
+}
+
+#define field_max(field) ((typeof(field))field_mask(field))
+
+#define __assert_field(v, field) \
+ do { \
+ if (__builtin_constant_p(v) && \
+ ((v) & ~field_mask(field))) \
+ __field_overflow(); \
+ } while (0)
+
+static __always_inline __must_check
+__u8 u8_encode_bits(u8 v, u8 field)
+{
+ __assert_field(v, field);
+ return (v & field_mask(field)) * field_multiplier(field);
+}
+
+static __always_inline __must_check
+__u8 u8_replace_bits(__u8 old, u8 val, u8 field)
+{
+ return (old & ~field) | u8_encode_bits(val, field);
+}
+
+static __always_inline
+void u8p_replace_bits(__u8 *p, u8 val, u8 field)
+{
+ *p = (*p & ~field) | u8_encode_bits(val, field);
+}
+
+static __always_inline __must_check
+u8 u8_get_bits(__u8 v, u8 field)
+{
+ return (v & field) / field_multiplier(field);
+}
+
+static __always_inline __must_check
+__le16 le16_encode_bits(u16 v, u16 field)
+{
+ __assert_field(v, field);
+ return cpu_to_le16((v & field_mask(field)) * field_multiplier(field));
+}
+
+static __always_inline
+void le16p_replace_bits(__le16 *p, u16 val, u16 field)
+{
+ *p = (*p & ~cpu_to_le16(field)) | le16_encode_bits(val, field);
+}
+
+static __always_inline __must_check
+u16 le16_get_bits(__le16 v, u16 field)
+{
+ return (le16_to_cpu(v) & field) / field_multiplier(field);
+}
+
+static __always_inline __must_check
+__be16 be16_encode_bits(u16 v, u16 field)
+{
+ __assert_field(v, field);
+ return cpu_to_be16((v & field_mask(field)) * field_multiplier(field));
+}
+
+static __always_inline __must_check
+u16 be16_get_bits(__be16 v, u16 field)
+{
+ return (be16_to_cpu(v) & field) / field_multiplier(field);
+}
+
+static __always_inline __must_check
+__u16 u16_encode_bits(u16 v, u16 field)
+{
+ __assert_field(v, field);
+ return (v & field_mask(field)) * field_multiplier(field);
+}
+
+static __always_inline __must_check
+__u16 u16_replace_bits(__u16 old, u16 val, u16 field)
+{
+ return (old & ~field) | u16_encode_bits(val, field);
+}
+
+static __always_inline
+void u16p_replace_bits(__u16 *p, u16 val, u16 field)
+{
+ *p = (*p & ~field) | u16_encode_bits(val, field);
+}
+
+static __always_inline __must_check
+u16 u16_get_bits(__u16 v, u16 field)
+{
+ return (v & field) / field_multiplier(field);
+}
+
+static __always_inline __must_check
+__le32 le32_encode_bits(u32 v, u32 field)
+{
+ __assert_field(v, field);
+ return cpu_to_le32((v & field_mask(field)) * field_multiplier(field));
+}
+
+static __always_inline
+void le32p_replace_bits(__le32 *p, u32 val, u32 field)
+{
+ *p = (*p & ~cpu_to_le32(field)) | le32_encode_bits(val, field);
+}
+
+static __always_inline __must_check
+u32 le32_get_bits(__le32 v, u32 field)
+{
+ return (le32_to_cpu(v) & field) / field_multiplier(field);
+}
+
+static __always_inline __must_check
+__be32 be32_encode_bits(u32 v, u32 field)
+{
+ __assert_field(v, field);
+ return cpu_to_be32((v & field_mask(field)) * field_multiplier(field));
+}
+
+static __always_inline
+void be32p_replace_bits(__be32 *p, u32 val, u32 field)
+{
+ *p = (*p & ~cpu_to_be32(field)) | be32_encode_bits(val, field);
+}
+
+static __always_inline __must_check
+u32 be32_get_bits(__be32 v, u32 field)
+{
+ return (be32_to_cpu(v) & field) / field_multiplier(field);
+}
+
+static __always_inline __must_check
+__u32 u32_encode_bits(u32 v, u32 field)
+{
+ __assert_field(v, field);
+ return (v & field_mask(field)) * field_multiplier(field);
+}
+
+static __always_inline __must_check
+__u32 u32_replace_bits(__u32 old, u32 val, u32 field)
+{
+ return (old & ~field) | u32_encode_bits(val, field);
+}
+
+static __always_inline
+void u32p_replace_bits(__u32 *p, u32 val, u32 field)
+{
+ *p = (*p & ~field) | u32_encode_bits(val, field);
+}
+
+static __always_inline __must_check
+u32 u32_get_bits(__u32 v, u32 field)
+{
+ return (v & field) / field_multiplier(field);
+}
+
+static __always_inline __must_check
+__le64 le64_encode_bits(u64 v, u64 field)
+{
+ __assert_field(v, field);
+ return cpu_to_le64((v & field_mask(field)) * field_multiplier(field));
+}
+
+static __always_inline __must_check
+u64 le64_get_bits(__le64 v, u64 field)
+{
+ return (le64_to_cpu(v) & field) / field_multiplier(field);
+}
+
+static __always_inline __must_check
+__be64 be64_encode_bits(u64 v, u64 field)
+{
+ __assert_field(v, field);
+ return cpu_to_be64((v & field_mask(field)) * field_multiplier(field));
+}
+
+static __always_inline __must_check
+u64 be64_get_bits(__be64 v, u64 field)
+{
+ return (be64_to_cpu(v) & field) / field_multiplier(field);
+}
+
+static __always_inline __must_check
+__u64 u64_encode_bits(u64 v, u64 field)
+{
+ __assert_field(v, field);
+ return (v & field_mask(field)) * field_multiplier(field);
+}
+
+static __always_inline __must_check
+__u64 u64_replace_bits(__u64 old, u64 val, u64 field)
+{
+ return (old & ~field) | u64_encode_bits(val, field);
+}
+
+static __always_inline
+void u64p_replace_bits(__u64 *p, u64 val, u64 field)
+{
+ *p = (*p & ~field) | u64_encode_bits(val, field);
+}
+
+static __always_inline __must_check
+u64 u64_get_bits(__u64 v, u64 field)
+{
+ return (v & field) / field_multiplier(field);
+}
+
+#endif /* _LINUX_BITFIELD_FIX_WIDTH_H */
diff --git a/include/linux/bitfield.h b/include/linux/bitfield.h
index 14f86e455a678b04a4588e80789ab74902324c9c..e3f7315c1d539bff0491f570b607881032ce1ddb 100644
--- a/include/linux/bitfield.h
+++ b/include/linux/bitfield.h
@@ -10,7 +10,7 @@
#include <linux/build_bug.h>
#include <linux/compiler.h>
#include <linux/typecheck.h>
-#include <asm/byteorder.h>
+#include <linux/bitfield-fix-width.h>
/*
* Bitfield access macros
@@ -211,53 +211,6 @@
*(_reg_p) |= (((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask)); \
})
-extern void __compiletime_error("value doesn't fit into mask")
-__field_overflow(void);
-extern void __compiletime_error("bad bitfield mask")
-__bad_mask(void);
-static __always_inline u64 field_multiplier(u64 field)
-{
- if ((field | (field - 1)) & ((field | (field - 1)) + 1))
- __bad_mask();
- return field & -field;
-}
-static __always_inline u64 field_mask(u64 field)
-{
- return field / field_multiplier(field);
-}
-#define field_max(field) ((typeof(field))field_mask(field))
-#define ____MAKE_OP(type,base,to,from) \
-static __always_inline __##type __must_check type##_encode_bits(base v, base field) \
-{ \
- if (__builtin_constant_p(v) && (v & ~field_mask(field))) \
- __field_overflow(); \
- return to((v & field_mask(field)) * field_multiplier(field)); \
-} \
-static __always_inline __##type __must_check type##_replace_bits(__##type old, \
- base val, base field) \
-{ \
- return (old & ~to(field)) | type##_encode_bits(val, field); \
-} \
-static __always_inline void type##p_replace_bits(__##type *p, \
- base val, base field) \
-{ \
- *p = (*p & ~to(field)) | type##_encode_bits(val, field); \
-} \
-static __always_inline base __must_check type##_get_bits(__##type v, base field) \
-{ \
- return (from(v) & field)/field_multiplier(field); \
-}
-#define __MAKE_OP(size) \
- ____MAKE_OP(le##size,u##size,cpu_to_le##size,le##size##_to_cpu) \
- ____MAKE_OP(be##size,u##size,cpu_to_be##size,be##size##_to_cpu) \
- ____MAKE_OP(u##size,u##size,,)
-____MAKE_OP(u8,u8,,)
-__MAKE_OP(16)
-__MAKE_OP(32)
-__MAKE_OP(64)
-#undef __MAKE_OP
-#undef ____MAKE_OP
-
#define __field_prep(mask, val) \
({ \
auto __mask = (mask); \
diff --git a/tools/include/linux/bitfield-fix-width.h b/tools/include/linux/bitfield-fix-width.h
new file mode 100644
index 0000000000000000000000000000000000000000..8c2a0fa224e9976d3587bb76c947b7cf8df4b8bb
--- /dev/null
+++ b/tools/include/linux/bitfield-fix-width.h
@@ -0,0 +1,236 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _LINUX_BITFIELD_FIX_WIDTH_H
+#define _LINUX_BITFIELD_FIX_WIDTH_H
+
+#include <linux/compiler.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <asm/byteorder.h>
+
+extern void __compiletime_error("value doesn't fit into mask")
+__field_overflow(void);
+
+extern void __compiletime_error("bad bitfield mask")
+__bad_mask(void);
+
+static __always_inline
+u64 field_multiplier(u64 field)
+{
+ if ((field | (field - 1)) & ((field | (field - 1)) + 1))
+ __bad_mask();
+ return field & -field;
+}
+
+static __always_inline
+u64 field_mask(u64 field)
+{
+ return field / field_multiplier(field);
+}
+
+#define field_max(field) ((typeof(field))field_mask(field))
+
+#define __assert_field(v, field) \
+ do { \
+ if (__builtin_constant_p(v) && \
+ ((v) & ~field_mask(field))) \
+ __field_overflow(); \
+ } while (0)
+
+static __always_inline
+__u8 u8_encode_bits(u8 v, u8 field)
+{
+ __assert_field(v, field);
+ return (v & field_mask(field)) * field_multiplier(field);
+}
+
+static __always_inline
+__u8 u8_replace_bits(__u8 old, u8 val, u8 field)
+{
+ return (old & ~field) | u8_encode_bits(val, field);
+}
+
+static __always_inline
+void u8p_replace_bits(__u8 *p, u8 val, u8 field)
+{
+ *p = (*p & ~field) | u8_encode_bits(val, field);
+}
+
+static __always_inline
+u8 u8_get_bits(__u8 v, u8 field)
+{
+ return (v & field) / field_multiplier(field);
+}
+
+static __always_inline
+__le16 le16_encode_bits(u16 v, u16 field)
+{
+ __assert_field(v, field);
+ return cpu_to_le16((v & field_mask(field)) * field_multiplier(field));
+}
+
+static __always_inline
+void le16p_replace_bits(__le16 *p, u16 val, u16 field)
+{
+ *p = (*p & ~cpu_to_le16(field)) | le16_encode_bits(val, field);
+}
+
+static __always_inline
+u16 le16_get_bits(__le16 v, u16 field)
+{
+ return (le16_to_cpu(v) & field) / field_multiplier(field);
+}
+
+static __always_inline
+__be16 be16_encode_bits(u16 v, u16 field)
+{
+ __assert_field(v, field);
+ return cpu_to_be16((v & field_mask(field)) * field_multiplier(field));
+}
+
+static __always_inline
+u16 be16_get_bits(__be16 v, u16 field)
+{
+ return (be16_to_cpu(v) & field) / field_multiplier(field);
+}
+
+static __always_inline
+__u16 u16_encode_bits(u16 v, u16 field)
+{
+ __assert_field(v, field);
+ return (v & field_mask(field)) * field_multiplier(field);
+}
+
+static __always_inline
+__u16 u16_replace_bits(__u16 old, u16 val, u16 field)
+{
+ return (old & ~field) | u16_encode_bits(val, field);
+}
+
+static __always_inline
+void u16p_replace_bits(__u16 *p, u16 val, u16 field)
+{
+ *p = (*p & ~field) | u16_encode_bits(val, field);
+}
+
+static __always_inline
+u16 u16_get_bits(__u16 v, u16 field)
+{
+ return (v & field) / field_multiplier(field);
+}
+
+static __always_inline
+__le32 le32_encode_bits(u32 v, u32 field)
+{
+ __assert_field(v, field);
+ return cpu_to_le32((v & field_mask(field)) * field_multiplier(field));
+}
+
+static __always_inline
+void le32p_replace_bits(__le32 *p, u32 val, u32 field)
+{
+ *p = (*p & ~cpu_to_le32(field)) | le32_encode_bits(val, field);
+}
+
+static __always_inline
+u32 le32_get_bits(__le32 v, u32 field)
+{
+ return (le32_to_cpu(v) & field) / field_multiplier(field);
+}
+
+static __always_inline
+__be32 be32_encode_bits(u32 v, u32 field)
+{
+ __assert_field(v, field);
+ return cpu_to_be32((v & field_mask(field)) * field_multiplier(field));
+}
+
+static __always_inline
+void be32p_replace_bits(__be32 *p, u32 val, u32 field)
+{
+ *p = (*p & ~cpu_to_be32(field)) | be32_encode_bits(val, field);
+}
+
+static __always_inline
+u32 be32_get_bits(__be32 v, u32 field)
+{
+ return (be32_to_cpu(v) & field) / field_multiplier(field);
+}
+
+static __always_inline
+__u32 u32_encode_bits(u32 v, u32 field)
+{
+ __assert_field(v, field);
+ return (v & field_mask(field)) * field_multiplier(field);
+}
+
+static __always_inline
+__u32 u32_replace_bits(__u32 old, u32 val, u32 field)
+{
+ return (old & ~field) | u32_encode_bits(val, field);
+}
+
+static __always_inline
+void u32p_replace_bits(__u32 *p, u32 val, u32 field)
+{
+ *p = (*p & ~field) | u32_encode_bits(val, field);
+}
+
+static __always_inline
+u32 u32_get_bits(__u32 v, u32 field)
+{
+ return (v & field) / field_multiplier(field);
+}
+
+static __always_inline
+__le64 le64_encode_bits(u64 v, u64 field)
+{
+ __assert_field(v, field);
+ return cpu_to_le64((v & field_mask(field)) * field_multiplier(field));
+}
+
+static __always_inline
+u64 le64_get_bits(__le64 v, u64 field)
+{
+ return (le64_to_cpu(v) & field) / field_multiplier(field);
+}
+
+static __always_inline
+__be64 be64_encode_bits(u64 v, u64 field)
+{
+ __assert_field(v, field);
+ return cpu_to_be64((v & field_mask(field)) * field_multiplier(field));
+}
+
+static __always_inline
+u64 be64_get_bits(__be64 v, u64 field)
+{
+ return (be64_to_cpu(v) & field) / field_multiplier(field);
+}
+
+static __always_inline
+__u64 u64_encode_bits(u64 v, u64 field)
+{
+ __assert_field(v, field);
+ return (v & field_mask(field)) * field_multiplier(field);
+}
+
+static __always_inline
+__u64 u64_replace_bits(__u64 old, u64 val, u64 field)
+{
+ return (old & ~field) | u64_encode_bits(val, field);
+}
+
+static __always_inline
+void u64p_replace_bits(__u64 *p, u64 val, u64 field)
+{
+ *p = (*p & ~field) | u64_encode_bits(val, field);
+}
+
+static __always_inline
+u64 u64_get_bits(__u64 v, u64 field)
+{
+ return (v & field) / field_multiplier(field);
+}
+
+#endif /* _LINUX_BITFIELD_FIX_WIDTH_H */
diff --git a/tools/include/linux/bitfield.h b/tools/include/linux/bitfield.h
index ddf81f24956ba069b2c1a7b096a6c9bf92fc9182..4508cefabec92d4e05a09ecf93b98bf4e304d305 100644
--- a/tools/include/linux/bitfield.h
+++ b/tools/include/linux/bitfield.h
@@ -9,7 +9,7 @@
#include <linux/build_bug.h>
#include <linux/kernel.h>
-#include <asm/byteorder.h>
+#include <linux/bitfield-fix-width.h>
/*
* Bitfield access macros
@@ -127,51 +127,4 @@
(typeof(_mask))(((_reg) & (_mask)) >> __bf_shf(_mask)); \
})
-extern void __compiletime_error("value doesn't fit into mask")
-__field_overflow(void);
-extern void __compiletime_error("bad bitfield mask")
-__bad_mask(void);
-static __always_inline u64 field_multiplier(u64 field)
-{
- if ((field | (field - 1)) & ((field | (field - 1)) + 1))
- __bad_mask();
- return field & -field;
-}
-static __always_inline u64 field_mask(u64 field)
-{
- return field / field_multiplier(field);
-}
-#define field_max(field) ((typeof(field))field_mask(field))
-#define ____MAKE_OP(type,base,to,from) \
-static __always_inline __##type type##_encode_bits(base v, base field) \
-{ \
- if (__builtin_constant_p(v) && (v & ~field_mask(field))) \
- __field_overflow(); \
- return to((v & field_mask(field)) * field_multiplier(field)); \
-} \
-static __always_inline __##type type##_replace_bits(__##type old, \
- base val, base field) \
-{ \
- return (old & ~to(field)) | type##_encode_bits(val, field); \
-} \
-static __always_inline void type##p_replace_bits(__##type *p, \
- base val, base field) \
-{ \
- *p = (*p & ~to(field)) | type##_encode_bits(val, field); \
-} \
-static __always_inline base type##_get_bits(__##type v, base field) \
-{ \
- return (from(v) & field)/field_multiplier(field); \
-}
-#define __MAKE_OP(size) \
- ____MAKE_OP(le##size,u##size,cpu_to_le##size,le##size##_to_cpu) \
- ____MAKE_OP(be##size,u##size,cpu_to_be##size,be##size##_to_cpu) \
- ____MAKE_OP(u##size,u##size,,)
-____MAKE_OP(u8,u8,,)
-__MAKE_OP(16)
-__MAKE_OP(32)
-__MAKE_OP(64)
-#undef __MAKE_OP
-#undef ____MAKE_OP
-
#endif
--
2.53.0
next reply other threads:[~2026-09-14 20:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-14 20:49 Yury Norov [this message]
2026-09-14 22:57 ` Jakub Kicinski
2026-09-15 4:55 ` Akihiko Odaki
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