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From eb8d1bbdfea80a50ce9fbf3238062a543036f855 Mon Sep 17 00:00:00 2001
From: Gustavo Zacarias <gustavo@zacarias.com.ar>
Date: Tue, 7 Oct 2014 11:03:03 -0300
Subject: [PATCH] btrfs-progs: add option to disable backtrace usage
This commit adds the support for a make variable named
"DISABLE_BACKTRACE" which allows to disable the support for backtrace()
usage on ASSERT(), BUG() and BUG_ON() calls.
This is useful because some alternative C libraries like uClibc have
optional support for backtrace() which is rarely built when debugging
isn't taking place.
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
---
Makefile | 4 ++++
kerncompat.h | 15 +++++++++++++++
2 files changed, 19 insertions(+)
diff --git a/Makefile b/Makefile
index 7cc7783..03a4779 100644
--- a/Makefile
+++ b/Makefile
@@ -63,6 +63,10 @@ BUILDDIRS = $(patsubst %,build-%,$(SUBDIRS))
INSTALLDIRS = $(patsubst %,install-%,$(SUBDIRS))
CLEANDIRS = $(patsubst %,clean-%,$(SUBDIRS))
+ifeq ($(DISABLE_BACKTRACE),1)
+AM_CFLAGS += -DBTRFS_DISABLE_BACKTRACE
+endif
+
ifneq ($(DISABLE_DOCUMENTATION),1)
BUILDDIRS += build-Documentation
INSTALLDIRS += install-Documentation
diff --git a/kerncompat.h b/kerncompat.h
index 19c7fa5..889d94c 100644
--- a/kerncompat.h
+++ b/kerncompat.h
@@ -29,7 +29,9 @@
#include <stddef.h>
#include <linux/types.h>
#include <stdint.h>
+#ifndef BTRFS_DISABLE_BACKTRACE
#include <execinfo.h>
+#endif
#define ptr_to_u64(x) ((u64)(uintptr_t)x)
#define u64_to_ptr(x) ((void *)(uintptr_t)x)
@@ -55,6 +57,7 @@
#define ULONG_MAX (~0UL)
#endif
+#ifndef BTRFS_DISABLE_BACKTRACE
#define MAX_BACKTRACE 16
static inline void print_trace(void)
{
@@ -81,6 +84,9 @@ static inline void assert_trace(const char *assertion, const char *filename,
}
#define BUG() assert_trace(NULL, __FILE__, __func__, __LINE__, 0)
+#else
+#define BUG() assert(0)
+#endif
#ifdef __CHECKER__
#define __force __attribute__((force))
@@ -264,10 +270,19 @@ static inline long IS_ERR(const void *ptr)
#define kstrdup(x, y) strdup(x)
#define kfree(x) free(x)
+#ifndef BTRFS_DISABLE_BACKTRACE
#define BUG_ON(c) assert_trace(#c, __FILE__, __func__, __LINE__, !(c))
+#else
+#define BUG_ON(c) assert(!(c))
+#endif
#define WARN_ON(c) BUG_ON(c)
+
+#ifndef BTRFS_DISABLE_BACKTRACE
#define ASSERT(c) assert_trace(#c, __FILE__, __func__, __LINE__, (c))
+#else
+#define ASSERT(c) assert(c)
+#endif
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
--
2.0.4
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