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[bpf-next,v3,1/3] selftests/bpf: Introduce cond_break_label

Message ID 20250305011849.1168917-2-memxor@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
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netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
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netdev/build_tools success Errors and warnings before: 26 (+0) this patch: 26 (+0)
netdev/cc_maintainers warning 11 maintainers not CCed: jolsa@kernel.org kpsingh@kernel.org linux-kselftest@vger.kernel.org sdf@fomichev.me john.fastabend@gmail.com haoluo@google.com mykolal@fb.com martin.lau@linux.dev shuah@kernel.org song@kernel.org yonghong.song@linux.dev
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Commit Message

Kumar Kartikeya Dwivedi March 5, 2025, 1:18 a.m. UTC 
Add a new cond_break_label macro that jumps to the specified label when
the cond_break termination check fires, and allows us to better handle
the uncontrolled termination of the loop.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 tools/testing/selftests/bpf/bpf_experimental.h | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h
index cd8ecd39c3f3..6535c8ae3c46 100644
--- a/tools/testing/selftests/bpf/bpf_experimental.h
+++ b/tools/testing/selftests/bpf/bpf_experimental.h
@@ -368,12 +368,12 @@  l_true:												\
 	ret;						\
 	})
 
-#define cond_break					\
+#define __cond_break(expr)				\
 	({ __label__ l_break, l_continue;		\
 	asm volatile goto("may_goto %l[l_break]"	\
 		      :::: l_break);			\
 	goto l_continue;				\
-	l_break: break;					\
+	l_break: expr;					\
 	l_continue:;					\
 	})
 #else
@@ -392,7 +392,7 @@  l_true:												\
 	ret;						\
 	})
 
-#define cond_break					\
+#define __cond_break(expr)				\
 	({ __label__ l_break, l_continue;		\
 	asm volatile goto("1:.byte 0xe5;		\
 		      .byte 0;				\
@@ -400,7 +400,7 @@  l_true:												\
 		      .short 0"				\
 		      :::: l_break);			\
 	goto l_continue;				\
-	l_break: break;					\
+	l_break: expr;					\
 	l_continue:;					\
 	})
 #else
@@ -418,7 +418,7 @@  l_true:												\
 	ret;						\
 	})
 
-#define cond_break					\
+#define __cond_break(expr)				\
 	({ __label__ l_break, l_continue;		\
 	asm volatile goto("1:.byte 0xe5;		\
 		      .byte 0;				\
@@ -426,12 +426,15 @@  l_true:												\
 		      .short 0"				\
 		      :::: l_break);			\
 	goto l_continue;				\
-	l_break: break;					\
+	l_break: expr;					\
 	l_continue:;					\
 	})
 #endif
 #endif
 
+#define cond_break __cond_break(break)
+#define cond_break_label(label) __cond_break(goto label)
+
 #ifndef bpf_nop_mov
 #define bpf_nop_mov(var) \
 	asm volatile("%[reg]=%[reg]"::[reg]"r"((short)var))