[xen staging] xen/arm: Skip loops in init_pdx() when no PDX compression is used

[patchbot@xxxxxxx]

commit b9c42be42e7426168cfcd13b1dfaece799af9fb0
Author:     Michal Orzel <michal.orzel@xxxxxxx>
AuthorDate: Fri Jul 4 09:54:28 2025 +0200
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxx>
CommitDate: Mon Jul 7 15:09:01 2025 -0700

    xen/arm: Skip loops in init_pdx() when no PDX compression is used
    
    When CONFIG_PDX_COMPRESSION=n, pdx_init_mask(), pdx_region_mask() and
    pfn_pdx_hole_setup() are just stubs doing nothing. It does not make
    sense to keep the two loops iterating over all the memory banks.
    
    Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
    Reviewed-by: Hari Limaye <hari.limaye@xxxxxxx>
    Tested-by: Hari Limaye <hari.limaye@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/setup.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 93b730ffb5..12b76a0a98 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -255,7 +255,9 @@ void __init init_pdx(void)
 {
     const struct membanks *mem = bootinfo_get_mem();
     paddr_t bank_start, bank_size, bank_end, ram_end = 0;
+    int bank;
 
+#ifdef CONFIG_PDX_COMPRESSION
     /*
      * Arm does not have any restrictions on the bits to compress. Pass 0 to
      * let the common code further restrict the mask.
@@ -264,7 +266,6 @@ void __init init_pdx(void)
      * update this function too.
      */
     uint64_t mask = pdx_init_mask(0x0);
-    int bank;
 
     for ( bank = 0 ; bank < mem->nr_banks; bank++ )
     {
@@ -284,6 +285,7 @@ void __init init_pdx(void)
     }
 
     pfn_pdx_hole_setup(mask >> PAGE_SHIFT);
+#endif
 
     for ( bank = 0 ; bank < mem->nr_banks; bank++ )
     {
--
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