linux-kernel - [PATCH] sysfs: remove signedness from sysfs_get

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Message-Id: <20170521085807.29276-1-nick.desaulniers@gmail.com>
Date:   Sun, 21 May 2017 01:58:07 -0700
From:   Nick Desaulniers <nick.desaulniers@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <nick.desaulniers@...il.com>
Subject: [PATCH] sysfs: remove signedness from sysfs_get_dirent

sysfs_get_dirent is usually invoked with a string literal, which
have the type char[].  While the toplevel Makefile
disables -Wpointer-sign, other Makefiles like

arch/x86/boot/compressed/Makefile

redefine KBUILD_CFLAGS. Fixes the warning:

In file included from arch/x86/boot/compressed/kaslr.c:17:
In file included from ./include/linux/module.h:17:
In file included from ./include/linux/kobject.h:21:
./include/linux/sysfs.h:517:37: warning: passing 'const unsigned char *'
to parameter of
      type 'const char *' converts between pointers to integer types
with different sign
      [-Wpointer-sign]
        return kernfs_find_and_get(parent, name);
                                           ^~~~
./include/linux/kernfs.h:462:57: note: passing argument to parameter
'name' here
kernfs_find_and_get(struct kernfs_node *kn, const char *name)
                                                        ^

Signed-off-by: Nick Desaulniers <nick.desaulniers@...il.com>
---
Alternatively, maybe
KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
should be added elsewhere like

arch/x86/boot/compressed/Makefile

 include/linux/sysfs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index c6f0f0d0e17e..7481fb72d927 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -512,7 +512,7 @@ static inline void sysfs_notify_dirent(struct kernfs_node *kn)
 }
 
 static inline struct kernfs_node *sysfs_get_dirent(struct kernfs_node *parent,
-						   const unsigned char *name)
+	const char *name)
 {
 	return kernfs_find_and_get(parent, name);
 }
-- 
2.11.0