On Wed, 02 Oct 2024 21:24:56 +0000 bugzilla-daemon@xxxxxxxxxx wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=219192 > > --- Comment #6 from Tudor Gheorghiu (tudor.reda@xxxxxxxxx) --- > 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. > So far no one has been able to identify an actual problem, so I'm treating this a false positive that will eventually get fixed from the compiler side. Or someone will explain what the issue in the code is. Jonathan
