[xen staging] virtual_region: address Misra C:2012 rule 18.3

[patchbot@xxxxxxx]

commit 581445c19b593bfe5ff52533dac411be8118559d
Author:     Dmytro Prokopchuk <dmytro_prokopchuk1@xxxxxxxx>
AuthorDate: Mon Oct 12 09:42:16 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Oct 12 09:42:16 2026 +0200

    virtual_region: address Misra C:2012 rule 18.3
    
    find_text_region() tests whether an arbitrary address lies inside
    [text_start, text_end). The address and those bounds are not known to
    point into one object, so relational operators on the pointers are
    undefined behaviour and violate Misra C:2012 rule 18.3.
    
    The bounds are cast to unsigned long because addr already has that
    type. The type is wide enough to hold a pointer, so the comparison
    result stays the same.
    
    No functional changes.
    
    Signed-off-by: Dmytro Prokopchuk <dmytro_prokopchuk1@xxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/common/virtual_region.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/common/virtual_region.c b/xen/common/virtual_region.c
index 1dc2e9f592..515751b6c3 100644
--- a/xen/common/virtual_region.c
+++ b/xen/common/virtual_region.c
@@ -83,8 +83,8 @@ const struct virtual_region *find_text_region(unsigned long 
addr)
     rcu_read_lock(&rcu_virtual_region_lock);
     list_for_each_entry_rcu ( iter, &virtual_region_list, list )
     {
-        if ( (void *)addr >= iter->text_start &&
-             (void *)addr <  iter->text_end )
+        if ( addr >= (unsigned long)iter->text_start &&
+             addr <  (unsigned long)iter->text_end )
         {
             region = iter;
             break;
--
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