When compiling the kernel with Clang, this warning appears even though it is disabled for the whole kernel because this folder has its own set of KBUILD_CFLAGS. It was disabled before the beginning of git history.
In file included from arch/x86/boot/compressed/kaslr.c:29: In file included from arch/x86/boot/compressed/misc.h:21: In file included from ./include/linux/elf.h:5: In file included from ./arch/x86/include/asm/elf.h:77: In file included from ./arch/x86/include/asm/vdso.h:11: In file included from ./include/linux/mm_types.h:9: In file included from ./include/linux/spinlock.h:88: In file included from ./arch/x86/include/asm/spinlock.h:43: In file included from ./arch/x86/include/asm/qrwlock.h:6: ./include/asm-generic/qrwlock.h:101:53: warning: passing 'u32 *' (aka 'unsigned int *') to parameter of type 'int *' converts between pointers to integer types with different sign [-Wpointer-sign] if (likely(atomic_try_cmpxchg_acquire(&lock->cnts, &cnts, _QW_LOCKED))) ^~~~~ ./include/linux/compiler.h:76:40: note: expanded from macro 'likely' # define likely(x) __builtin_expect(!!(x), 1) ^ ./include/asm-generic/atomic-instrumented.h:69:66: note: passing argument to parameter 'old' here static __always_inline bool atomic_try_cmpxchg(atomic_t *v, int *old, int new) ^ Signed-off-by: Nathan Chancellor <natechancel...@gmail.com> --- There has been some discussion around whether KBUILD_CFLAGS should be overwritten in the folder (few examples linked below). In the meantime, there is precedent for taking top level disabled warnings and adding them here, thus this patch. * https://lore.kernel.org/lkml/CAKwvOdmXcztP542kADhyJYN2=Fk3qyXif_MCs=kqpge8qtt...@mail.gmail.com/ * https://lore.kernel.org/lkml/56442061-7f55-878d-5b26-7cdd14e90...@zytor.com/ arch/x86/boot/compressed/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile index 28764dacf018..466f66c8a7f8 100644 --- a/arch/x86/boot/compressed/Makefile +++ b/arch/x86/boot/compressed/Makefile @@ -37,6 +37,7 @@ KBUILD_CFLAGS += $(call cc-option,-ffreestanding) KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector) KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) KBUILD_CFLAGS += $(call cc-disable-warning, gnu) +KBUILD_CFLAGS += -Wno-pointer-sign KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ GCOV_PROFILE := n -- 2.19.1