Re: linux-next: build failure after merge of the tip tree

[Ricardo Neri]

On Tue, Dec 13, 2022 at 12:40:23PM +1100, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the tip tree, today's linux-next build (x86_64 allmodconfig)
> failed like this:
> 
> In file included from include/linux/uaccess.h:11,
>                  from include/linux/sched/task.h:11,
>                  from include/linux/sched/signal.h:9,
>                  from include/linux/rcuwait.h:6,
>                  from include/linux/percpu-rwsem.h:7,
>                  from include/linux/fs.h:33,
>                  from include/linux/highmem.h:5,
>                  from include/linux/bvec.h:10,
>                  from include/linux/blk_types.h:10,
>                  from include/linux/blkdev.h:9,
>                  from drivers/scsi/scsi_ioctl.c:9:
> drivers/scsi/scsi_ioctl.c: In function 'sg_scsi_ioctl':
> arch/x86/include/asm/uaccess.h:46:9: error: cast specifies array type
>    46 |         (__force __typeof__(ptr))__ptrval;                              \
>       |         ^
> arch/x86/include/asm/uaccess.h:107:38: note: in definition of macro '__typefits'
>   107 |         __builtin_choose_expr(sizeof(x)<=sizeof(type),(unsigned type)0,not)
>       |                                      ^
> arch/x86/include/asm/uaccess.h:130:18: note: in expansion of macro '__inttype'
>   130 |         register __inttype(*(ptr)) __val_gu asm("%"_ASM_DX);            \
>       |                  ^~~~~~~~~
> arch/x86/include/asm/uaccess.h:162:9: note: in expansion of macro 'do_get_user_call'
>   162 |         do_get_user_call(get_user,x,untagged_ptr(current->mm, ptr));    \
>       |         ^~~~~~~~~~~~~~~~
> arch/x86/include/asm/uaccess.h:162:37: note: in expansion of macro 'untagged_ptr'
>   162 |         do_get_user_call(get_user,x,untagged_ptr(current->mm, ptr));    \
>       |                                     ^~~~~~~~~~~~
> drivers/scsi/scsi_ioctl.c:522:13: note: in expansion of macro 'get_user'
>   522 |         if (get_user(opcode, sic->data))
>       |             ^~~~~~~~
> 
> Caused by commit
> 
>   ce66a02538f3 ("x86/mm: Fix sparse warnings in untagged_ptr()")
> 
> (the scsi code above has not changed since at least February ...)
> 
> I have reverted that commit for today.

There is a patch from Kirill that fixes this issue. It seems that its on
it's way to be merged [1].

Thanks and BR,
Ricardo

[1]. https://lore.kernel.org/lkml/166986602299.2101055.4152803267481265665.b4-ty@xxxxxxxxxx/