queue/5.15 kernel build failure

[Chuck Lever <chuck.lever@oracle.com>]

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
Author:     Keith Busch <kbusch@kernel.org>
AuthorDate: Tue Jul 15 11:46:22 2025 -0700
Commit:     Sasha Levin <sashal@kernel.org>
CommitDate: Sun Aug 17 09:30:59 2025 -0400

    vfio/type1: conditional rescheduling while pinning

    [ Upstream commit b1779e4f209c7ff7e32f3c79d69bca4e3a3a68b6 ]

    A large DMA mapping request can loop through dma address pinning for
    many pages. In cases where THP can not be used, the repeated
vmf_insert_pfn can
    be costly, so let the task reschedule as need to prevent CPU stalls.
Failure to

  ...

-- 
Chuck Lever