On Fri, Mar 9, 2018 at 3:02 PM, Andrey Konovalov [off-list ref] wrote:

To allow arm64 syscalls accept tagged pointers from userspace, we must
untag them when they are passed to the kernel. Since untagging is done in
generic parts of the kernel (like the mm subsystem), the untagged_addr
macro should be defined for all architectures.

Define it as a noop for all other architectures besides arm64.

Signed-off-by: Andrey Konovalov <redacted>
---
 arch/alpha/include/asm/uaccess.h      | 2 ++
 arch/arc/include/asm/uaccess.h        | 1 +
 arch/arm/include/asm/uaccess.h        | 2 ++
 arch/blackfin/include/asm/uaccess.h   | 2 ++
 arch/c6x/include/asm/uaccess.h        | 2 ++
 arch/cris/include/asm/uaccess.h       | 2 ++
 arch/frv/include/asm/uaccess.h        | 2 ++
 arch/ia64/include/asm/uaccess.h       | 2 ++
 arch/m32r/include/asm/uaccess.h       | 2 ++
 arch/m68k/include/asm/uaccess.h       | 2 ++
 arch/metag/include/asm/uaccess.h      | 2 ++
 arch/microblaze/include/asm/uaccess.h | 2 ++
 arch/mips/include/asm/uaccess.h       | 2 ++
 arch/mn10300/include/asm/uaccess.h    | 2 ++
 arch/nios2/include/asm/uaccess.h      | 2 ++
 arch/openrisc/include/asm/uaccess.h   | 2 ++
 arch/parisc/include/asm/uaccess.h     | 2 ++
 arch/powerpc/include/asm/uaccess.h    | 2 ++
 arch/riscv/include/asm/uaccess.h      | 2 ++
 arch/score/include/asm/uaccess.h      | 2 ++
 arch/sh/include/asm/uaccess.h         | 2 ++
 arch/sparc/include/asm/uaccess.h      | 2 ++
 arch/tile/include/asm/uaccess.h       | 2 ++
 arch/x86/include/asm/uaccess.h        | 2 ++
 arch/xtensa/include/asm/uaccess.h     | 2 ++
 include/asm-generic/uaccess.h         | 2 ++
 26 files changed, 51 insertions(+)

I have patches to remove the blackfin, cris, frv, m32r, metag, mn10300,
score, tile and unicore32 architectures from the kernel, these should be
part of linux-next in the next few days. It's not a big issue, but if you keep
patching them, this will cause a merge conflict.

It might be easier to drop them from your patch as well.

    Arnd