Fix mis-uses of 'cc-option' for warning disablement

This was triggered by one of my mis-uses causing odd build warnings on
sparc in linux-next, but while figuring out why the "obviously correct"
use of cc-option caused such odd breakage, I found eight other cases of
the same thing in the tree.

The root cause is that 'cc-option' doesn't work for checking negative
warning options (ie things like '-Wno-stringop-overflow') because gcc
will silently accept options it doesn't recognize, and so 'cc-option'
ends up thinking they are perfectly fine.

And it all works, until you have a situation where _another_ warning is
emitted.  At that point the compiler will go "Hmm, maybe the user
intended to disable this warning but used that wrong option that I
didn't recognize", and generate a warning for the unrecognized negative
option.

Which explains why we have several cases of this in the tree: the
'cc-option' test really doesn't work for this situation, but most of the
time it simply doesn't matter that ity doesn't work.

The reason my recently added case caused problems on sparc was pointed
out by Thomas Weißschuh: the sparc build had a previous explicit warning
that then triggered the new one.

I think the best fix for this would be to make 'cc-option' a bit smarter
about this sitation, possibly by adding an intentional warning to the
test case that then triggers the unrecognized option warning reliably.

But the short-term fix is to replace 'cc-option' with an existing helper
designed for this exact case: 'cc-disable-warning', which picks the
negative warning but uses the positive form for testing the compiler
support.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Link: https://lore.kernel.org/all/20250422204718.0b4e3f81@canb.auug.org.au/
Explained-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Makefile b/Makefile
index e94bbb2..07f8181 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1053,11 +1053,11 @@ NOSTDINC_FLAGS += -nostdinc
 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
 
 #Currently, disable -Wstringop-overflow for GCC 11, globally.
-KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow)
+KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-disable-warning, stringop-overflow)
 KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow)
 
 #Currently, disable -Wunterminated-string-initialization as broken
-KBUILD_CFLAGS += $(call cc-option, -Wno-unterminated-string-initialization)
+KBUILD_CFLAGS += $(call cc-disable-warning, unterminated-string-initialization)
 
 # disable invalid "can't wrap" optimizations for signed / pointers
 KBUILD_CFLAGS  += -fno-strict-overflow

diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile
index 4853e8b..f9dcaa6 100644 (file)
--- a/arch/loongarch/kernel/Makefile
+++ b/arch/loongarch/kernel/Makefile
@@ -21,10 +21,10 @@ obj-$(CONFIG_CPU_HAS_LBT)   += lbt.o
 
 obj-$(CONFIG_ARCH_STRICT_ALIGN)        += unaligned.o
 
-CFLAGS_module.o                += $(call cc-option,-Wno-override-init,)
-CFLAGS_syscall.o       += $(call cc-option,-Wno-override-init,)
-CFLAGS_traps.o         += $(call cc-option,-Wno-override-init,)
-CFLAGS_perf_event.o    += $(call cc-option,-Wno-override-init,)
+CFLAGS_module.o                += $(call cc-disable-warning, override-init)
+CFLAGS_syscall.o       += $(call cc-disable-warning, override-init)
+CFLAGS_traps.o         += $(call cc-disable-warning, override-init)
+CFLAGS_perf_event.o    += $(call cc-disable-warning, override-init)
 
 ifdef CONFIG_FUNCTION_TRACER
   ifndef CONFIG_DYNAMIC_FTRACE

diff --git a/arch/loongarch/kvm/Makefile b/arch/loongarch/kvm/Makefile
index f4c8e35..cb41d92 100644 (file)
--- a/arch/loongarch/kvm/Makefile
+++ b/arch/loongarch/kvm/Makefile
@@ -21,4 +21,4 @@ kvm-y += intc/eiointc.o
 kvm-y += intc/pch_pic.o
 kvm-y += irqfd.o
 
-CFLAGS_exit.o  += $(call cc-option,-Wno-override-init,)
+CFLAGS_exit.o  += $(call cc-disable-warning, override-init)

diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
index 8d186bf..f7480c9 100644 (file)
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
@@ -9,8 +9,8 @@ CFLAGS_REMOVE_patch.o   = $(CC_FLAGS_FTRACE)
 CFLAGS_REMOVE_sbi.o    = $(CC_FLAGS_FTRACE)
 CFLAGS_REMOVE_return_address.o = $(CC_FLAGS_FTRACE)
 endif
-CFLAGS_syscall_table.o += $(call cc-option,-Wno-override-init,)
-CFLAGS_compat_syscall_table.o += $(call cc-option,-Wno-override-init,)
+CFLAGS_syscall_table.o += $(call cc-disable-warning, override-init)
+CFLAGS_compat_syscall_table.o += $(call cc-disable-warning, override-init)
 
 ifdef CONFIG_KEXEC_CORE
 AFLAGS_kexec_relocate.o := -mcmodel=medany $(call cc-option,-mno-relax)

diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index d758975..2d6e595 100644 (file)
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -15,7 +15,7 @@ KBUILD_CFLAGS += -Werror=return-type
 KBUILD_CFLAGS += -Werror=strict-prototypes
 KBUILD_CFLAGS += -Wno-format-security
 KBUILD_CFLAGS += -Wno-trigraphs
-KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
+KBUILD_CFLAGS += $(call cc-disable-warning, frame-address)
 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
 KBUILD_CFLAGS += -Wmissing-declarations
 KBUILD_CFLAGS += -Wmissing-prototypes