diff options
| author | Tony Breeds | 2008-09-02 16:50:38 +1000 |
|---|---|---|
| committer | Paul Mackerras | 2008-09-03 20:53:34 +1000 |
| commit | 7563dc64585324f443f5ac107eb6d89ee813a2d2 (patch) | |
| tree | ad97560d4280d844ff5a2c0c574962ef4fefa671 /arch/powerpc/kernel | |
| parent | 303996dace16894710a5291327eeb79afdb8ed12 (diff) | |
powerpc: Work around gcc's -fno-omit-frame-pointer bug
This bug is causing random crashes
(http://bugzilla.kernel.org/show_bug.cgi?id=11414).
-fno-omit-frame-pointer is only needed on powerpc when -pg is also
supplied, and there is a gcc bug that causes incorrect code generation
on 32-bit powerpc when -fno-omit-frame-pointer is used---it uses stack
locations below the stack pointer, which is not allowed by the ABI
because those locations can and sometimes do get corrupted by an
interrupt.
This ensures that CONFIG_FRAME_POINTER is only selected by ftrace.
When CONFIG_FTRACE is enabled we also pass -mno-sched-epilog to work
around the gcc codegen bug.
Patch based on work by:
Andreas Schwab <schwab@suse.de>
Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/Makefile | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index 64f5948ebc9d..946daea780f1 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -14,12 +14,13 @@ endif ifdef CONFIG_FTRACE # Do not trace early boot code -CFLAGS_REMOVE_cputable.o = -pg -CFLAGS_REMOVE_prom_init.o = -pg +CFLAGS_REMOVE_cputable.o = -pg -mno-sched-epilog +CFLAGS_REMOVE_prom_init.o = -pg -mno-sched-epilog +CFLAGS_REMOVE_btext.o = -pg -mno-sched-epilog ifdef CONFIG_DYNAMIC_FTRACE # dynamic ftrace setup. -CFLAGS_REMOVE_ftrace.o = -pg +CFLAGS_REMOVE_ftrace.o = -pg -mno-sched-epilog endif endif |