[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 #6 from Tudor Gheorghiu (tudor.reda@gmail.com) ---
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)
>    0x117e <adis16300_channels+1182>:  add    %al,(%rax)
>    0x1180 <adis16300_channels+1184>:  add    $0x0,%al
>    0x1182 <adis16300_channels+1186>:  add    %al,(%rax)

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

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.