linux-kernel - [PATCH 1/2] IB/qib: don't use qib_wc_x86

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Date:   Sat,  1 Jan 2022 23:06:09 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org, Jason Gunthorpe <jgg@...dia.com>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>
Cc:     linux-rdma@...r.kernel.org, linux-um@...ts.infradead.org,
        Randy Dunlap <rdunlap@...radead.org>
Subject: [PATCH 1/2] IB/qib: don't use qib_wc_x86_64 for UML

When building qib_wc_x86_64.c on ARCH=um, references to some cpuinfo
fields cause build errors since cpuinfo does not contain x86-specific
fields.

This source file is x86_64-specific, so don't include it in the
target object file when CONFIG_UML is set/enabled.

Prevents these build errors:

../drivers/infiniband/hw/qib/qib_wc_x86_64.c: In function ‘qib_unordered_wc’:
../drivers/infiniband/hw/qib/qib_wc_x86_64.c:149:22: error: ‘struct cpuinfo_um’ has no member named ‘x86_vendor’
  return boot_cpu_data.x86_vendor != X86_VENDOR_AMD;
                      ^
../drivers/infiniband/hw/qib/qib_wc_x86_64.c:149:37: error: ‘X86_VENDOR_AMD’ undeclared (first use in this function); did you mean ‘X86_VENDOR_ANY’?
  return boot_cpu_data.x86_vendor != X86_VENDOR_AMD;
                                     ^~~~~~~~~~~~~~
../drivers/infiniband/hw/qib/qib_wc_x86_64.c:150:1: error: control reaches end of non-void function [-Werror=return-type]

Fixes: 68f5d3f3b654 ("um: add PCI over virtio emulation driver")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
---
 drivers/infiniband/hw/qib/Makefile |    2 ++
 1 file changed, 2 insertions(+)

--- linux-next-20211224.orig/drivers/infiniband/hw/qib/Makefile
+++ linux-next-20211224/drivers/infiniband/hw/qib/Makefile
@@ -12,6 +12,8 @@ ib_qib-y := qib_diag.o qib_driver.o qib_
 # 6120 has no fallback if no MSI interrupts, others can do INTx
 ib_qib-$(CONFIG_PCI_MSI) += qib_iba6120.o
 
+ifeq ($(CONFIG_UML),)
 ib_qib-$(CONFIG_X86_64) += qib_wc_x86_64.o
+endif
 ib_qib-$(CONFIG_PPC64) += qib_wc_ppc64.o
 ib_qib-$(CONFIG_DEBUG_FS) += qib_debugfs.o