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From: Mauro Rossi <issor.oruam@gmail.com>
Date: Sun, 1 May 2022 20:40:42 +0200
Message-ID: <CAEQFVGZfq17gj9z7Z_MDVUAsx-e16cJ3h1KVzcZ1-eimBcGoag@mail.gmail.com>
Subject: Re: Android 11 clang toochain: kernel 5.18 build error with 32 bit target
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>, Chih-Wei Huang <cwhuang@android-x86.org>, 
	clang-built-linux <llvm@lists.linux.dev>
Content-Type: text/plain; charset="UTF-8"

> As promised I have rechecked the kernel build with Android 11 prebuilt
> toolchain (clang 11.0.2)
>
>   CC      mm/maccess.o
> /home/utente/r-x86_kernel/kernel/mm/maccess.c:37:3: error: invalid
> output size for constraint '=a'
>                 copy_from_kernel_nofault_loop(dst, src, size, u64, Efault);
>                 ^
> /home/utente/r-x86_kernel/kernel/mm/maccess.c:19:3: note: expanded
> from macro 'copy_from_kernel_nofault_loop'
>                 __get_kernel_nofault(dst, src, type, err_label);
>          \
>                 ^
> /home/utente/r-x86_kernel/kernel/arch/x86/include/asm/uaccess.h:538:18:
> note: expanded from macro '__get_kernel_nofault'
>         __get_user_size(*((type *)(dst)), (__force type __user *)(src), \
>                         ^
> /home/utente/r-x86_kernel/kernel/mm/maccess.c:37:3: error: invalid
> output size for constraint '=a'
> /home/utente/r-x86_kernel/kernel/mm/maccess.c:19:3: note: expanded
> from macro 'copy_from_kernel_nofault_loop'
>                 __get_kernel_nofault(dst, src, type, err_label);
>          \
>                 ^
> /home/utente/r-x86_kernel/kernel/arch/x86/include/asm/uaccess.h:538:18:
> note: expanded from macro '__get_kernel_nofault'
>         __get_user_size(*((type *)(dst)), (__force type __user *)(src), \
>                         ^
> 2 errors generated.
>
> At this point I will proceed in testing the build with Nick proposed
> changes in __get_user_size()
> and report back
>
> Thank you
> M.

Hello,

Nick proposed patch works for 32bit build and shows no regression in 64bit build
For Nick, in case you are not submitting for kernel-5.18 could you
please provide me with
commit title and message and allow me to use the fix in our future
android-x86 LTS kernel builds?

Thank you

Mauro