[xen staging] arm/mpu: Implement stubs for ioremap_attr on MPU

[patchbot@xxxxxxx]

commit 2cd02c27d3277b0fe664040e10445818a48b6492
Author:     Luca Fancellu <luca.fancellu@xxxxxxx>
AuthorDate: Tue Apr 1 09:58:56 2025 +0100
Commit:     Michal Orzel <michal.orzel@xxxxxxx>
CommitDate: Wed Apr 2 11:15:10 2025 +0200

    arm/mpu: Implement stubs for ioremap_attr on MPU
    
    Implement ioremap_attr() stub for MPU system; the
    implementation of ioremap() is the same between MMU
    and MPU system, and it relies on ioremap_attr(), so
    move the definition from mmu/pt.c to arm/mm.c.
    
    Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
    Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
---
 xen/arch/arm/mm.c     | 5 +++++
 xen/arch/arm/mmu/pt.c | 5 -----
 xen/arch/arm/mpu/mm.c | 6 ++++++
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index a56e20ba2b..5a52f0c623 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -395,6 +395,11 @@ unsigned long get_upper_mfn_bound(void)
     return max_page - 1;
 }
 
+void *ioremap(paddr_t pa, size_t len)
+{
+    return ioremap_attr(pa, len, PAGE_HYPERVISOR_NOCACHE);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/arm/mmu/pt.c b/xen/arch/arm/mmu/pt.c
index da28d669e7..11cb1c66da 100644
--- a/xen/arch/arm/mmu/pt.c
+++ b/xen/arch/arm/mmu/pt.c
@@ -223,11 +223,6 @@ void *ioremap_attr(paddr_t start, size_t len, unsigned int 
attributes)
     return ptr + offs;
 }
 
-void *ioremap(paddr_t pa, size_t len)
-{
-    return ioremap_attr(pa, len, PAGE_HYPERVISOR_NOCACHE);
-}
-
 static int create_xen_table(lpae_t *entry)
 {
     mfn_t mfn;
diff --git a/xen/arch/arm/mpu/mm.c b/xen/arch/arm/mpu/mm.c
index 3632011c10..4e9a2405d8 100644
--- a/xen/arch/arm/mpu/mm.c
+++ b/xen/arch/arm/mpu/mm.c
@@ -17,6 +17,12 @@ static void __init __maybe_unused build_assertions(void)
     BUILD_BUG_ON(PAGE_SIZE != SZ_4K);
 }
 
+void __iomem *ioremap_attr(paddr_t start, size_t len, unsigned int flags)
+{
+    BUG_ON("unimplemented");
+    return NULL;
+}
+
 /*
  * Local variables:
  * mode: C
--
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