linux-kernel - [PATCH v2 2/4] modpost: make updating the symbol namespace explicit

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Message-Id: <20191018093143.15997-3-maennich@google.com>
Date:   Fri, 18 Oct 2019 10:31:41 +0100
From:   Matthias Maennich <maennich@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     kernel-team@...roid.com, maennich@...gle.com,
        Jessica Yu <jeyu@...nel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Martijn Coenen <maco@...roid.com>,
        Lucas De Marchi <lucas.de.marchi@...il.com>,
        Shaun Ruffell <sruffell@...ffell.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Will Deacon <will@...nel.org>, linux-kbuild@...r.kernel.org,
        linux-modules@...r.kernel.org
Subject: [PATCH v2 2/4] modpost: make updating the symbol namespace explicit

Setting the symbol namespace of a symbol within sym_add_exported feels
displaced and lead to issues in the current implementation of symbol
namespaces. This patch makes updating the namespace an explicit call to
decouple it from adding a symbol to the export list.

Acked-by: Will Deacon <will@...nel.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reviewed-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
Signed-off-by: Matthias Maennich <maennich@...gle.com>
---
 scripts/mod/modpost.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index dbfa3997136b..95b1eac656aa 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -385,8 +385,8 @@ static void sym_update_namespace(const char *symname, const char *namespace)
  * Add an exported symbol - it may have already been added without a
  * CRC, in this case just update the CRC
  **/
-static struct symbol *sym_add_exported(const char *name, const char *namespace,
-				       struct module *mod, enum export export)
+static struct symbol *sym_add_exported(const char *name, struct module *mod,
+				       enum export export)
 {
 	struct symbol *s = find_symbol(name);
 
@@ -402,7 +402,6 @@ static struct symbol *sym_add_exported(const char *name, const char *namespace,
 			s->module = mod;
 		}
 	}
-	sym_update_namespace(name, namespace);
 	s->preloaded = 0;
 	s->vmlinux   = is_vmlinux(mod->name);
 	s->kernel    = 0;
@@ -764,7 +763,8 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
 		if (strstarts(symname, "__ksymtab_")) {
 			name = symname + strlen("__ksymtab_");
 			namespace = sym_extract_namespace(&name);
-			sym_add_exported(name, namespace, mod, export);
+			sym_add_exported(name, mod, export);
+			sym_update_namespace(name, namespace);
 			free(namespace);
 		}
 		if (strcmp(symname, "init_module") == 0)
@@ -2472,12 +2472,12 @@ static void read_dump(const char *fname, unsigned int kernel)
 			mod = new_module(modname);
 			mod->skip = 1;
 		}
-		s = sym_add_exported(symname, namespace, mod,
-				     export_no(export));
+		s = sym_add_exported(symname, mod, export_no(export));
 		s->kernel    = kernel;
 		s->preloaded = 1;
 		s->is_static = 0;
 		sym_update_crc(symname, mod, crc, export_no(export));
+		sym_update_namespace(symname, namespace);
 	}
 	release_file(file, size);
 	return;
-- 
2.23.0.866.gb869b98d4c-goog