Re: queue/5.15 kernel build failure

[Sasha Levin <sashal@kernel.org>]

On Sun, Aug 17, 2025 at 01:11:14PM -0400, Chuck Lever wrote:
>Hi-
>
>Building on RHEL 9.6, I encountered this build failure:
>
>arch/x86/kernel/smp.o: warning: objtool: fred_sysvec_reboot()+0x52:
>unreachable instruction
>drivers/gpu/drm/vmwgfx/vmwgfx_msg.o: warning: objtool:
>vmw_port_hb_out()+0xbf: stack state mismatch: cfa1=5+16 cfa2=4+8
>drivers/gpu/drm/vmwgfx/vmwgfx_msg.o: warning: objtool:
>vmw_port_hb_in()+0xb4: stack state mismatch: cfa1=5+16 cfa2=4+8
>drivers/vfio/vfio_iommu_type1.c: In function ‘vfio_pin_pages_remote’:
>drivers/vfio/vfio_iommu_type1.c:707:25: error: ISO C90 forbids mixed
>declarations and code [-Werror=declaration-after-statement]
>  707 |                         long req_pages = min_t(long, npage,
>batch->capacity);
>      |                         ^~~~
>cc1: all warnings being treated as errors
>gmake[2]: *** [scripts/Makefile.build:289:
>drivers/vfio/vfio_iommu_type1.o] Error 1
>gmake[1]: *** [scripts/Makefile.build:552: drivers/vfio] Error 2
>gmake[1]: *** Waiting for unfinished jobs....
>gmake: *** [Makefile:1926: drivers] Error 2
>
>Appears to be due to:
>
>commit 5c87f3aff907e72fa6759c9dc66eb609dec1815c

I've dropped this, thanks for the report.

It's a bit funny - my version of gcc treats it as a warning, and it actually
gives me quite a few mote "mixed decrlataions" warnings in the 5.15
allmodconfig build.

Compilers are hard :)

-- 
Thanks,
Sasha