[RFC PATCH 04/30] scripts/kallysms: Always include __start and __stop symbols

[Suren Baghdasaryan <surenb@xxxxxxxxxx>]

From: Kent Overstreet <kent.overstreet@xxxxxxxxx>

These symbols are used to denote section boundaries: by always including
them we can unify loading sections from modules with loading built-in
sections, which leads to some significant cleanup.

Signed-off-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>
---
 scripts/kallsyms.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index f18e6dfc68c5..3d51639a595d 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -263,6 +263,11 @@ static int symbol_in_range(const struct sym_entry *s,
        return 0;
 }
 
+static bool string_starts_with(const char *s, const char *prefix)
+{
+       return strncmp(s, prefix, strlen(prefix)) == 0;
+}
+
 static int symbol_valid(const struct sym_entry *s)
 {
        const char *name = sym_name(s);
@@ -270,6 +275,14 @@ static int symbol_valid(const struct sym_entry *s)
        /* if --all-symbols is not specified, then symbols outside the text
         * and inittext sections are discarded */
        if (!all_symbols) {
+               /*
+                * Symbols starting with __start and __stop are used to denote
+                * section boundaries, and should always be included:
+                */
+               if (string_starts_with(name, "__start_") ||
+                   string_starts_with(name, "__stop_"))
+                       return 1;
+
                if (symbol_in_range(s, text_ranges,
                                    ARRAY_SIZE(text_ranges)) == 0)
                        return 0;
-- 
2.37.2.672.g94769d06f0-goog