From: Johannes Berg <johannes.berg@intel.com>
Date: Sun, 12 Feb 2023 19:32:04 +0000 (+0100)
Subject: um: add __weak for exported functions
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ce1831fe2febf7a3a03fda43b41d7589caa022cd;p=linux.git

um: add __weak for exported functions

If the exported glibc functions don't exist, we get link
failures. Avoid that by adding __weak so they're allowed
to not exist.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Richard Weinberger <richard@nod.at>
---

diff --git a/arch/um/os-Linux/user_syms.c b/arch/um/os-Linux/user_syms.c
index fd575ecbcaece..54722c7f884f6 100644
--- a/arch/um/os-Linux/user_syms.c
+++ b/arch/um/os-Linux/user_syms.c
@@ -39,7 +39,7 @@ EXPORT_SYMBOL(printf);
  * good; so the versions of these symbols will always match
  */
 #define EXPORT_SYMBOL_PROTO(sym)       \
-	int sym(void);                  \
+	int sym(void) __weak; \
 	EXPORT_SYMBOL(sym);
 
 extern void readdir64(void) __attribute__((weak));