linux-kernel - [PATCH 5.18 817/879] um: Use asm-generic/dma-mapping.h

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Message-Id: <20220607165026.568459082@linuxfoundation.org>
Date:   Tue,  7 Jun 2022 19:05:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
        Johannes Berg <johannes.berg@...el.com>,
        Richard Weinberger <richard@....at>
Subject: [PATCH 5.18 817/879] um: Use asm-generic/dma-mapping.h

From: Johannes Berg <johannes.berg@...el.com>

commit 365719035526e8eda214a1cedb2e1c96e969a0d7 upstream.

If DMA (PCI over virtio) is enabled, then some drivers may
enable CONFIG_DMA_OPS as well, and then we pull in the x86
definition of get_arch_dma_ops(), which uses the dma_ops
symbol, which isn't defined.

Since we don't have real DMA ops nor any kind of IOMMU fix
this in the simplest possible way: pull in the asm-generic
file instead of inheriting the x86 one. It's not clear why
those drivers that do (e.g. VDPA) "select DMA_OPS", and if
they'd even work with this, but chances are nobody will be
wanting to do that anyway, so fixing the build failure is
good enough.

Reported-by: Randy Dunlap <rdunlap@...radead.org>
Fixes: 68f5d3f3b654 ("um: add PCI over virtio emulation driver")
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Tested-by: Randy Dunlap <rdunlap@...radead.org>
Acked-by: Randy Dunlap <rdunlap@...radead.org>
Cc: stable@...r.kernel.org
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/um/include/asm/Kbuild |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/um/include/asm/Kbuild
+++ b/arch/um/include/asm/Kbuild
@@ -4,6 +4,7 @@ generic-y += bug.h
 generic-y += compat.h
 generic-y += current.h
 generic-y += device.h
+generic-y += dma-mapping.h
 generic-y += emergency-restart.h
 generic-y += exec.h
 generic-y += extable.h