Commit ef6000b4 authored by Linus Torvalds's avatar Linus Torvalds

Disable the __builtin_return_address() warning globally after all

This affectively reverts commit 377ccbb4 ("Makefile: Mute warning
for __builtin_return_address(>0) for tracing only") because it turns out
that it really isn't tracing only - it's all over the tree.

We already also had the warning disabled separately for mm/usercopy.c
(which this commit also removes), and it turns out that we will also
want to disable it for get_lock_parent_ip(), that is used for at least
TRACE_IRQFLAGS.  Which (when enabled) ends up being all over the tree.

Steven Rostedt had a patch that tried to limit it to just the config
options that actually triggered this, but quite frankly, the extra
complexity and abstraction just isn't worth it.  We have never actually
had a case where the warning is actually useful, so let's just disable
it globally and not worry about it.
Acked-by: default avatarSteven Rostedt <>
Cc: Thomas Gleixner <>
Cc: Andrew Morton <>
Cc: Ingo Molnar <>
Cc: Peter Anvin <>
Signed-off-by: default avatarLinus Torvalds <>
parent 1573d2ca
......@@ -621,6 +621,7 @@ 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,)
# We are fully aware of the dangers of __builtin_return_address()
FRAME_CFLAGS := $(call cc-disable-warning,frame-address)
# Do not instrument the tracer itself:
......@@ -21,9 +21,6 @@ KCOV_INSTRUMENT_memcontrol.o := n
KCOV_INSTRUMENT_mmzone.o := n
KCOV_INSTRUMENT_vmstat.o := n
# Since __builtin_frame_address does work as used, disable the warning.
CFLAGS_usercopy.o += $(call cc-disable-warning, frame-address)
mmu-y := nommu.o
mmu-$(CONFIG_MMU) := gup.o highmem.o memory.o mincore.o \
mlock.o mmap.o mprotect.o mremap.o msync.o rmap.o \
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