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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-27 19:03:04 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-27 19:03:04 -0700 |
commit | 124a3d88fa20e1869fc229d7d8c740cc81944264 (patch) | |
tree | 50f90c10a4d2626f371e7dab332d3dcc7bb32b34 /Makefile | |
parent | 8448cefe499a45222430ebbcabcd9e26369895c3 (diff) | |
download | lwn-124a3d88fa20e1869fc229d7d8c740cc81944264.tar.gz lwn-124a3d88fa20e1869fc229d7d8c740cc81944264.zip |
Disable "frame-address" warning
Newer versions of gcc warn about the use of __builtin_return_address()
with a non-zero argument when "-Wall" is specified:
kernel/trace/trace_irqsoff.c: In function ‘stop_critical_timings’:
kernel/trace/trace_irqsoff.c:433:86: warning: calling ‘__builtin_return_address’ with a nonzero argument is unsafe [-Wframe-address]
stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
[ .. repeats a few times for other similar cases .. ]
It is true that a non-zero argument is somewhat dangerous, and we do not
actually have very many uses of that in the kernel - but the ftrace code
does use it, and as Stephen Rostedt says:
"We are well aware of the danger of using __builtin_return_address() of
> 0. In fact that's part of the reason for having the "thunk" code in
x86 (See arch/x86/entry/thunk_{64,32}.S). [..] it adds extra frames
when tracking irqs off sections, to prevent __builtin_return_address()
from accessing bad areas. In fact the thunk_32.S states: 'Trampoline to
trace irqs off. (otherwise CALLER_ADDR1 might crash)'."
For now, __builtin_return_address() with a non-zero argument is the best
we can do, and the warning is not helpful and can end up making people
miss other warnings for real problems.
So disable the frame-address warning on compilers that need it.
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Makefile')
-rw-r--r-- | Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
@@ -620,6 +620,7 @@ include arch/$(SRCARCH)/Makefile KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) +KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE KBUILD_CFLAGS += -Os |