[xen staging] tools/xenstore: Check the format printf for xprintf() and barf{,_perror}()

[patchbot@xxxxxxx]

commit 1fff444679a1ffa67d0bf55744b80555ab58f9f8
Author:     Julien Grall <jgrall@xxxxxxxxxx>
AuthorDate: Fri Mar 5 12:40:03 2021 +0000
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Thu Mar 11 09:47:02 2021 +0000

    tools/xenstore: Check the format printf for xprintf() and barf{,_perror}()
    
    Allow GCC to analyze the format printf for xprintf() and
    barf{,_perror}().
    
    Take the opportunity to define __noreturn to make the prototype for
    barf{,_perror})() easier to read.
    
    Also document why 'extern' is used for xprintf().
    
    Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
    Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
    Release-Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
---
 tools/xenstore/utils.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/tools/xenstore/utils.h b/tools/xenstore/utils.h
index 3dfb96b556..87713a8e5d 100644
--- a/tools/xenstore/utils.h
+++ b/tools/xenstore/utils.h
@@ -29,10 +29,13 @@ const char *dump_state_align(FILE *fp);
 
 #define PRINTF_ATTRIBUTE(a1, a2) __attribute__((format (printf, a1, a2)))
 
-void barf(const char *fmt, ...) __attribute__((noreturn));
-void barf_perror(const char *fmt, ...) __attribute__((noreturn));
+#define __noreturn __attribute__((noreturn))
 
-extern void (*xprintf)(const char *fmt, ...);
+void barf(const char *fmt, ...) __noreturn PRINTF_ATTRIBUTE(1, 2);
+void barf_perror(const char *fmt, ...) __noreturn PRINTF_ATTRIBUTE(1, 2);
+
+/* Function pointer as xprintf() can be configured at runtime. */
+extern void (*xprintf)(const char *fmt, ...) PRINTF_ATTRIBUTE(1, 2);
 
 #define eprintf(_fmt, _args...) xprintf("[ERR] %s" _fmt, __FUNCTION__, ##_args)
 
--
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