[Bug 219192] drivers/iio/imu/adis16400.o: warning: objtool: adis16400_write_raw() falls through to next function adis16400_show_flash_count()

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219192

--- Comment #8 from Andy Shevchenko (andy.shevchenko@gmail.com) ---
(In reply to Tudor Gheorghiu from comment #6)
> I saw this bugreport and I must say I encountered a somewhat similar but
> not quite the same warning message from objtool when compiling with
> clang.
> 
> This is my environment:
> Linux version 6.12.0-rc1+ (Ubuntu clang version 18.1.3 (1ubuntu1), Ubuntu
> LLD 18.1.3)
> 
> This is the objtool warning:
> > drivers/iio/imu/adis16400.o: warning: objtool: adis16400_write_raw+0x89:
> > can't find jump dest instruction at .text+0x8be
> 
> I dissasembled the binary and this is what I found at that offset:
> >    0x0000000000000781 <+113>: jmp    0x8a4 <adis16400_write_raw+404>
> >    0x0000000000000786 <+118>: mov    %rdi,%r12
> >    0x0000000000000789 <+121>: lea    0x30(%r14),%rdi
> >    0x000000000000078d <+125>: call   0x792 <adis16400_write_raw+130>
> >    0x0000000000000792 <+130>: mov    %r14,%rbx
> >    0x0000000000000795 <+133>: add    $0x30,%rbx
> >    0x0000000000000799 <+137>: je     0x8be
> 
> Looking at .text+0x8be:
> > (gdb) x/4i 0x00000000000008be+0x8be
> >    0x117c <adis16300_channels+1180>:  add    %al,(%rax)

How did you get 0x117c? It can't be correct offset AFAIU all this.

> >    0x117e <adis16300_channels+1182>:  add    %al,(%rax)
> >    0x1180 <adis16300_channels+1184>:  add    $0x0,%al
> >    0x1182 <adis16300_channels+1186>:  add    %al,(%rax)

The above looks to me like a data or so. But I don't remember by heart the
actual binary codes for these assembly to be sure.

> I cannot tell if this is an actual issue, or just a false positive,
> but I decided to post my findings here nevertheless.

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