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-rw-r--r--arch/arc/include/asm/bug.h3
-rw-r--r--arch/cris/include/arch-v10/arch/bug.h11
-rw-r--r--arch/ia64/include/asm/bug.h6
-rw-r--r--arch/m68k/include/asm/bug.h3
-rw-r--r--arch/sparc/include/asm/bug.h6
-rw-r--r--include/asm-generic/bug.h1
-rw-r--r--include/linux/compiler-gcc.h15
-rw-r--r--include/linux/compiler.h5
8 files changed, 44 insertions, 6 deletions
diff --git a/arch/arc/include/asm/bug.h b/arch/arc/include/asm/bug.h
index ea022d47896c..21ec82466d62 100644
--- a/arch/arc/include/asm/bug.h
+++ b/arch/arc/include/asm/bug.h
@@ -23,7 +23,8 @@ void die(const char *str, struct pt_regs *regs, unsigned long address);
#define BUG() do { \
pr_warn("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
- dump_stack(); \
+ barrier_before_unreachable(); \
+ __builtin_trap(); \
} while (0)
#define HAVE_ARCH_BUG
diff --git a/arch/cris/include/arch-v10/arch/bug.h b/arch/cris/include/arch-v10/arch/bug.h
index 905afeacfedf..06da9d49152a 100644
--- a/arch/cris/include/arch-v10/arch/bug.h
+++ b/arch/cris/include/arch-v10/arch/bug.h
@@ -44,18 +44,25 @@ struct bug_frame {
* not be used like this with newer versions of gcc.
*/
#define BUG() \
+do { \
__asm__ __volatile__ ("clear.d [" __stringify(BUG_MAGIC) "]\n\t"\
"movu.w " __stringify(__LINE__) ",$r0\n\t"\
"jump 0f\n\t" \
".section .rodata\n" \
"0:\t.string \"" __FILE__ "\"\n\t" \
- ".previous")
+ ".previous"); \
+ unreachable(); \
+} while (0)
#endif
#else
/* This just causes an oops. */
-#define BUG() (*(int *)0 = 0)
+#define BUG() \
+do { \
+ barrier_before_unreachable(); \
+ __builtin_trap(); \
+} while (0)
#endif
diff --git a/arch/ia64/include/asm/bug.h b/arch/ia64/include/asm/bug.h
index bd3eeb8d1cfa..66b37a532765 100644
--- a/arch/ia64/include/asm/bug.h
+++ b/arch/ia64/include/asm/bug.h
@@ -4,7 +4,11 @@
#ifdef CONFIG_BUG
#define ia64_abort() __builtin_trap()
-#define BUG() do { printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); ia64_abort(); } while (0)
+#define BUG() do { \
+ printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
+ barrier_before_unreachable(); \
+ ia64_abort(); \
+} while (0)
/* should this BUG be made generic? */
#define HAVE_ARCH_BUG
diff --git a/arch/m68k/include/asm/bug.h b/arch/m68k/include/asm/bug.h
index b7e2bf1ba4a6..275dca1435bf 100644
--- a/arch/m68k/include/asm/bug.h
+++ b/arch/m68k/include/asm/bug.h
@@ -8,16 +8,19 @@
#ifndef CONFIG_SUN3
#define BUG() do { \
pr_crit("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
+ barrier_before_unreachable(); \
__builtin_trap(); \
} while (0)
#else
#define BUG() do { \
pr_crit("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
+ barrier_before_unreachable(); \
panic("BUG!"); \
} while (0)
#endif
#else
#define BUG() do { \
+ barrier_before_unreachable(); \
__builtin_trap(); \
} while (0)
#endif
diff --git a/arch/sparc/include/asm/bug.h b/arch/sparc/include/asm/bug.h
index 6f17528356b2..ea53e418f6c0 100644
--- a/arch/sparc/include/asm/bug.h
+++ b/arch/sparc/include/asm/bug.h
@@ -9,10 +9,14 @@
void do_BUG(const char *file, int line);
#define BUG() do { \
do_BUG(__FILE__, __LINE__); \
+ barrier_before_unreachable(); \
__builtin_trap(); \
} while (0)
#else
-#define BUG() __builtin_trap()
+#define BUG() do { \
+ barrier_before_unreachable(); \
+ __builtin_trap(); \
+} while (0)
#endif
#define HAVE_ARCH_BUG
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 963b755d19b0..a7613e1b0c87 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -52,6 +52,7 @@ struct bug_entry {
#ifndef HAVE_ARCH_BUG
#define BUG() do { \
printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
+ barrier_before_unreachable(); \
panic("BUG!"); \
} while (0)
#endif
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 73bc63e0a1c4..901c1ccb3374 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -208,6 +208,15 @@
#endif
/*
+ * calling noreturn functions, __builtin_unreachable() and __builtin_trap()
+ * confuse the stack allocation in gcc, leading to overly large stack
+ * frames, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82365
+ *
+ * Adding an empty inline assembly before it works around the problem
+ */
+#define barrier_before_unreachable() asm volatile("")
+
+/*
* Mark a position in code as unreachable. This can be used to
* suppress control flow warnings after asm blocks that transfer
* control elsewhere.
@@ -217,7 +226,11 @@
* unreleased. Really, we need to have autoconf for the kernel.
*/
#define unreachable() \
- do { annotate_unreachable(); __builtin_unreachable(); } while (0)
+ do { \
+ annotate_unreachable(); \
+ barrier_before_unreachable(); \
+ __builtin_unreachable(); \
+ } while (0)
/* Mark a function definition as prohibited from being cloned. */
#define __noclone __attribute__((__noclone__, __optimize__("no-tracer")))
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index e835fc0423ec..ab4711c63601 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -86,6 +86,11 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
# define barrier_data(ptr) barrier()
#endif
+/* workaround for GCC PR82365 if needed */
+#ifndef barrier_before_unreachable
+# define barrier_before_unreachable() do { } while (0)
+#endif
+
/* Unreachable code */
#ifdef CONFIG_STACK_VALIDATION
/*