Re: Build failure in v5.15.133

[Nick Desaulniers <ndesaulniers@google.com>]

On Wed, Sep 27, 2023 at 06:37:10AM -0700, Guenter Roeck wrote:
> Hi,
> 
> I see the following build failure with v5.15.133.
> 
> Build reference: v5.15.133
> Compiler version: aarch64-linux-gcc (GCC) 11.4.0
> Assembler version: GNU assembler (GNU Binutils) 2.40
> 
> Building arm64:allnoconfig ... passed
> Building arm64:tinyconfig ... passed
> Building arm64:defconfig ... failed
> --------------
> Error log:
> drivers/interconnect/core.c: In function 'icc_init':
> drivers/interconnect/core.c:1148:9: error: implicit declaration of function 'fs_reclaim_acquire' [-Werror=implicit-function-declaration]
>  1148 |         fs_reclaim_acquire(GFP_KERNEL);
>       |         ^~~~~~~~~~~~~~~~~~
> drivers/interconnect/core.c:1150:9: error: implicit declaration of function 'fs_reclaim_release' [-Werror=implicit-function-declaration]
>  1150 |         fs_reclaim_release(GFP_KERNEL);
>       |         ^~~~~~~~~~~~~~~~~~
> 
> This also affects alpha:allmodconfig and m68k:allmodconfig. The problem
> was introduced with 'interconnect: Teach lockdep about icc_bw_lock order'.
> 
> #include <linux/sched/mm.h> is missing. Presumably that is included
> indirectly in the upstream kernel, but I wasn't able to determine which
> commit added it.
> 
> Guenter

Thanks for the report, our CI is also pretty red for ARCH=arm64
linux-5.15.y builds. Also one ARCH=arm build we have that's using
Alpine's config is hitting the same issue.  Making note of this with our
ML CC'ed so that other folks don't potentially re-triage. Happy to hear
there's already a fix inbound.