From 4538cee5bf12dfa71d837d45c68783af4de07537 Mon Sep 17 00:00:00 2001
From: Mark Johnston <markj@FreeBSD.org>
Date: Sun, 2 Oct 2016 00:35:00 +0000
Subject: [PATCH] Allow tracing of functions prefixed by "__".

This restriction was inherited from upstream but is not relevant on FreeBSD.
Furthermore, it hindered the tracing of locking primitive subroutines.

MFC after:	1 week
---
 sys/cddl/dev/fbt/arm/fbt_isa.c     | 3 ---
 sys/cddl/dev/fbt/fbt.c             | 4 ----
 sys/cddl/dev/fbt/powerpc/fbt_isa.c | 3 ---
 sys/cddl/dev/fbt/x86/fbt_isa.c     | 3 ---
 4 files changed, 13 deletions(-)

diff --git a/sys/cddl/dev/fbt/arm/fbt_isa.c b/sys/cddl/dev/fbt/arm/fbt_isa.c
index 592e59802bb..068610acf83 100644
--- a/sys/cddl/dev/fbt/arm/fbt_isa.c
+++ b/sys/cddl/dev/fbt/arm/fbt_isa.c
@@ -106,9 +106,6 @@ fbt_provide_module_function(linker_file_t lf, int symindx,
 		return (0);
 	}
 
-	if (name[0] == '_' && name[1] == '_')
-		return (0);
-
 	instr = (uint32_t *)symval->value;
 	limit = (uint32_t *)(symval->value + symval->size);
 
diff --git a/sys/cddl/dev/fbt/fbt.c b/sys/cddl/dev/fbt/fbt.c
index 19018f98705..41de3794f95 100644
--- a/sys/cddl/dev/fbt/fbt.c
+++ b/sys/cddl/dev/fbt/fbt.c
@@ -126,10 +126,6 @@ fbt_excluded(const char *name)
 		return (1);
 	}
 
-	/* Exclude some internal functions */
-	if (name[0] == '_' && name[1] == '_')
-		return (1);
-
 	/*
 	 * When DTrace is built into the kernel we need to exclude
 	 * the FBT functions from instrumentation.
diff --git a/sys/cddl/dev/fbt/powerpc/fbt_isa.c b/sys/cddl/dev/fbt/powerpc/fbt_isa.c
index 0568e55046d..e67e837742a 100644
--- a/sys/cddl/dev/fbt/powerpc/fbt_isa.c
+++ b/sys/cddl/dev/fbt/powerpc/fbt_isa.c
@@ -138,9 +138,6 @@ fbt_provide_module_function(linker_file_t lf, int symindx,
 		return (0);
 	}
 
-	if (name[0] == '_' && name[1] == '_')
-		return (0);
-
 	instr = (uint32_t *) symval->value;
 	limit = (uint32_t *) (symval->value + symval->size);
 
diff --git a/sys/cddl/dev/fbt/x86/fbt_isa.c b/sys/cddl/dev/fbt/x86/fbt_isa.c
index 6639806d11a..51cfc64c112 100644
--- a/sys/cddl/dev/fbt/x86/fbt_isa.c
+++ b/sys/cddl/dev/fbt/x86/fbt_isa.c
@@ -174,9 +174,6 @@ fbt_provide_module_function(linker_file_t lf, int symindx,
 		return (0);
 	}
 
-	if (name[0] == '_' && name[1] == '_')
-		return (0);
-
 	size = symval->size;
 
 	instr = (uint8_t *) symval->value;