[xen master] mm/pdx: Mark pdx hole description globals readonly after boot

[patchbot@xxxxxxx]

commit 408a191b749b3d1620ad7ec9c614bab5924530c2
Author:     Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>
AuthorDate: Tue Jul 18 12:40:53 2023 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jul 18 12:40:53 2023 +0200

    mm/pdx: Mark pdx hole description globals readonly after boot
    
    They define where the compressible area of valid mfns is, and all of them
    are populated on boot (with the exception of max_pdx, that's updated on
    memory hotplug).
    
    No functional change.
    
    Signed-off-by: Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/common/pdx.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/xen/common/pdx.c b/xen/common/pdx.c
index ec64d3d2ef..99d4a90a50 100644
--- a/xen/common/pdx.c
+++ b/xen/common/pdx.c
@@ -47,30 +47,33 @@
  * ones.
  */
 
-/** Maximum (non-inclusive) usable pdx */
+/**
+ * Maximum (non-inclusive) usable pdx. Must be
+ * modifiable after init due to memory hotplug
+ */
 unsigned long __read_mostly max_pdx;
 
 /** Mask for the lower non-compressible bits of an mfn */
-unsigned long __read_mostly pfn_pdx_bottom_mask = ~0UL;
+unsigned long __ro_after_init pfn_pdx_bottom_mask = ~0UL;
 
 /** Mask for the lower non-compressible bits of an maddr or vaddr */
-unsigned long __read_mostly ma_va_bottom_mask = ~0UL;
+unsigned long __ro_after_init ma_va_bottom_mask = ~0UL;
 
 /** Mask for the higher non-compressible bits of an mfn */
-unsigned long __read_mostly pfn_top_mask = 0;
+unsigned long __ro_after_init pfn_top_mask = 0;
 
 /** Mask for the higher non-compressible bits of an maddr or vaddr */
-unsigned long __read_mostly ma_top_mask = 0;
+unsigned long __ro_after_init ma_top_mask = 0;
 
 /**
  * Mask for a pdx compression bit slice.
  *
  *  Invariant: valid(mfn) implies (mfn & pfn_hole_mask) == 0
  */
-unsigned long __read_mostly pfn_hole_mask = 0;
+unsigned long __ro_after_init pfn_hole_mask = 0;
 
 /** Number of bits of the "compressible" bit slice of an mfn */
-unsigned int __read_mostly pfn_pdx_hole_shift = 0;
+unsigned int __ro_after_init pfn_pdx_hole_shift = 0;
 
 unsigned long __read_mostly pdx_group_valid[BITS_TO_LONGS(
     (FRAMETABLE_NR + PDX_GROUP_COUNT - 1) / PDX_GROUP_COUNT)] = { [0] = 1 };
--
generated by git-patchbot for /home/xen/git/xen.git#master