[xen staging] symbols: also special-case symbols aliasing _sinittext

[patchbot@xxxxxxx]

commit 8b383ed0a340d0152715701284323abad70ea2fb
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Sep 23 09:01:25 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Sep 23 10:01:14 2026 +0200

    symbols: also special-case symbols aliasing _sinittext
    
    A recent 4.22 randconfig build job hit a situation where (LIVEPATCH=n,
    i.e. --all-symbols not specified) both __note_gnu_build_id_end and
    _erodata aliased _sinittext on the 1st linking pass, but they didn't on
    the 2nd one. As a result two fewer symbols were emitted on the 2nd pass,
    causing $(call compare-symbol-tables, ...) to fail.
    
    Extend the existing "corner case" by also considering aliases with
    _sinittext (_stext really shouldn't have anything ahead of it), but
    discard only non-text symbols.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Roger Pau Monné <roger@xxxxxxxxxxxxxx>
---
 xen/tools/symbols.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/xen/tools/symbols.c b/xen/tools/symbols.c
index 3f2fb15836..9db1c0a20c 100644
--- a/xen/tools/symbols.c
+++ b/xen/tools/symbols.c
@@ -217,6 +217,11 @@ static int symbol_valid(struct sym_entry *s)
                if ((s->addr == _etext && strcmp((char*)s->sym + offset, 
"_etext")) ||
                    (s->addr == _einittext && strcmp((char*)s->sym + offset, 
"_einittext")))
                        return 0;
+               /* Same for non-text aliases of _sinittext. */
+               if (toupper(*s->sym) != 'T'
+                   && s->addr == _sinittext
+                   && strcmp((const char *)s->sym + offset, "_sinittext"))
+                       return 0;
        }
 
        /* Exclude symbols which vary between passes. */
--
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