Re: stable-rc: 4.14 and 4.19: arch/x86/kernel/head_32.S:126: Error: invalid character '(' in mnemonic

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Fri, Nov 03, 2023 at 09:07:32PM +0530, Naresh Kamboju wrote:
> Following warnings and errors have been noticed while building i386 build
> on stable-rc linux.4.19.y and linux.4.14.y.
> 
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> 
> Build log:
> ==========
> kernel/profile.c: In function 'profile_dead_cpu':
> kernel/profile.c:346:27: warning: the comparison will always evaluate
> as 'true' for the address of 'prof_cpu_mask' will never be NULL
> [-Waddress]
>   346 |         if (prof_cpu_mask != NULL)
>       |                           ^~
> kernel/profile.c:49:22: note: 'prof_cpu_mask' declared here
>    49 | static cpumask_var_t prof_cpu_mask;
>       |                      ^~~~~~~~~~~~~
> kernel/profile.c: In function 'profile_online_cpu':
> kernel/profile.c:383:27: warning: the comparison will always evaluate
> as 'true' for the address of 'prof_cpu_mask' will never be NULL
> [-Waddress]
>   383 |         if (prof_cpu_mask != NULL)
>       |                           ^~
> kernel/profile.c:49:22: note: 'prof_cpu_mask' declared here
>    49 | static cpumask_var_t prof_cpu_mask;
>       |                      ^~~~~~~~~~~~~
> kernel/profile.c: In function 'profile_tick':
> kernel/profile.c:413:47: warning: the comparison will always evaluate
> as 'true' for the address of 'prof_cpu_mask' will never be NULL
> [-Waddress]
>   413 |         if (!user_mode(regs) && prof_cpu_mask != NULL &&
>       |                                               ^~
> kernel/profile.c:49:22: note: 'prof_cpu_mask' declared here
>    49 | static cpumask_var_t prof_cpu_mask;
>       |                      ^~~~~~~~~~~~~

Those are not due to this set of patches, right?

> arch/x86/kernel/head_32.S: Assembler messages:
> arch/x86/kernel/head_32.S:126: Error: invalid character '(' in mnemonic
> arch/x86/kernel/head_32.S:57:  Info: macro invoked from here
> arch/x86/kernel/head_32.S:128: Error: invalid character '(' in mnemonic
> arch/x86/kernel/head_32.S:57:  Info: macro invoked from here

This is odd, nothing touches this file either.

7e09ac27f43b ("x86: Fix .brk attribute in linker script") is backported
here, perhaps that is the issue?  If you revert that, does the error go
away?

Let me see if I can build a 32 bit kernel anymore...

thanks,

greg k-h