As reported by Will Deacon the following compilation warning appears during the compilation of the vdso32:
In file included from ./arch/arm64/include/asm/thread_info.h:17:0, from ./include/linux/thread_info.h:38, from ./arch/arm64/include/asm/preempt.h:5, from ./include/linux/preempt.h:78, from ./include/linux/spinlock.h:51, from ./include/linux/seqlock.h:36, from ./include/linux/time.h:6, from .../work/linux/lib/vdso/gettimeofday.c:7, from <command-line>:0: ./arch/arm64/include/asm/memory.h: In function ‘__tag_set’: ./arch/arm64/include/asm/memory.h:233:15: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] u64 __addr = (u64)addr & ~__tag_shifted(0xff); ^ In file included from ./arch/arm64/include/asm/pgtable-hwdef.h:8:0, from ./arch/arm64/include/asm/processor.h:34, from ./arch/arm64/include/asm/elf.h:118, from ./include/linux/elf.h:5, from ./include/linux/elfnote.h:62, from arch/arm64/kernel/vdso32/note.c:11: ./arch/arm64/include/asm/memory.h: In function ‘__tag_set’: ./arch/arm64/include/asm/memory.h:233:15: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] u64 __addr = (u64)addr & ~__tag_shifted(0xff); ^ This happens because few 64 bit compilation headers are included during the generation of vdso32. Fix the issue redefining the __tag_set function. Note: This fix is meant to be temporary, a more comprehensive solution based on the refactoring of the generic headers will be provided with a future patch set. At that point it will be possible to revert this patch. Cc: Will Deacon <w...@kernel.org> Cc: Catalin Marinas <catalin.mari...@arm.com> Signed-off-by: Vincenzo Frascino <vincenzo.frasc...@arm.com> --- arch/arm64/include/asm/memory.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index b61b50bf68b1..cfa9cd87af14 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -228,11 +228,16 @@ static inline unsigned long kaslr_offset(void) #define __tag_get(addr) 0 #endif /* CONFIG_KASAN_SW_TAGS */ +#ifdef __aarch64__ static inline const void *__tag_set(const void *addr, u8 tag) { u64 __addr = (u64)addr & ~__tag_shifted(0xff); return (const void *)(__addr | __tag_shifted(tag)); } +#else +/* Unused in compat vdso */ +#define __tag_set(addr, tag) 0 +#endif /* * Physical vs virtual RAM address space conversion. These are -- 2.23.0