linux-kernel - [PATCH 4.19 205/205] CONFIG_XEN_PV breaks xen_create_contiguous

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Message-Id: <20181119162642.972489706@linuxfoundation.org>
Date:   Mon, 19 Nov 2018 17:28:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stefano Stabellini <stefanos@...inx.com>,
        Juergen Gross <jgross@...e.com>, Jeff.Kubascik@...nerworks.com,
        Jarvis.Roach@...nerworks.com, Nathan.Studer@...nerworks.com,
        vkuznets@...hat.com, boris.ostrovsky@...cle.com,
        julien.grall@....com
Subject: [PATCH 4.19 205/205] CONFIG_XEN_PV breaks xen_create_contiguous_region on ARM

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefano Stabellini <stefanos@...inx.com>

commit f9005571701920551bcf54a500973fb61f2e1eda upstream.

xen_create_contiguous_region has now only an implementation if
CONFIG_XEN_PV is defined. However, on ARM we never set CONFIG_XEN_PV but
we do have an implementation of xen_create_contiguous_region which is
required for swiotlb-xen to work correctly (although it just sets
*dma_handle).

[backport: remove change to xen_remap_pfn]

Cc: <stable@...r.kernel.org> # 4.12
Fixes: 16624390816c ("xen: create xen_create/destroy_contiguous_region() stubs for PVHVM only builds")
Signed-off-by: Stefano Stabellini <stefanos@...inx.com>
Reviewed-by: Juergen Gross <jgross@...e.com>
CC: Jeff.Kubascik@...nerworks.com
CC: Jarvis.Roach@...nerworks.com
CC: Nathan.Studer@...nerworks.com
CC: vkuznets@...hat.com
CC: boris.ostrovsky@...cle.com
CC: jgross@...e.com
CC: julien.grall@....com
Signed-off-by: Juergen Gross <jgross@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/xen/xen-ops.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -41,7 +41,7 @@ int xen_setup_shutdown_event(void);
 
 extern unsigned long *xen_contiguous_bitmap;
 
-#ifdef CONFIG_XEN_PV
+#if defined(CONFIG_XEN_PV) || defined(CONFIG_ARM) || defined(CONFIG_ARM64)
 int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
 				unsigned int address_bits,
 				dma_addr_t *dma_handle);