[PATCH] x86: constify fsname parameter of find_mnt_by_fsname()

[PATCH] x86: constify fsname parameter of find_mnt_by_fsname()

[Simon Horman]

find_mnt_by_fsname() is called with constant strings as its
fsname parameter and does not modify this parameter, thus
it seems appropriate to make the parameter const.

This problem was brought to my attention by gcc:

$ gcc --version
gcc (Debian 6.3.0-18) 6.3.0 20170516
...

$ make
...
kexec/arch/i386/x86-linux-setup.c: In function ‘get_bootparam’:
kexec/arch/i386/x86-linux-setup.c:447:33: warning: passing argument 1 of ‘find_mnt_by_fsname’ discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
  sysfs_mnt = find_mnt_by_fsname("sysfs");
                                 ^~~~~~~
kexec/arch/i386/x86-linux-setup.c:422:7: note: expected ‘char *’ but argument is of type ‘const char *’
 char *find_mnt_by_fsname(char *fsname)
       ^~~~~~~~~~~~~~~~~~
kexec/arch/i386/x86-linux-setup.c:458:36: warning: passing argument 1 of ‘find_mnt_by_fsname’ discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
   debugfs_mnt = find_mnt_by_fsname("debugfs");
                                    ^~~~~~~~~
kexec/arch/i386/x86-linux-setup.c:422:7: note: expected ‘char *’ but argument is of type ‘const char *’
 char *find_mnt_by_fsname(char *fsname)
...

Signed-off-by: Simon Horman <horms@verge.net.au>
---
 kexec/arch/i386/x86-linux-setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kexec/arch/i386/x86-linux-setup.c b/kexec/arch/i386/x86-linux-setup.c
index 2152a2191743..181d7dba2c23 100644
--- a/kexec/arch/i386/x86-linux-setup.c
+++ b/kexec/arch/i386/x86-linux-setup.c
@@ -419,7 +419,7 @@ out:
  * to be mounted once (sysfs, debugsfs, proc), as it will return the first
  * instance listed in mtab.
  */
-char *find_mnt_by_fsname(char *fsname)
+char *find_mnt_by_fsname(const char *fsname)
 {
 	FILE *mtab;
 	struct mntent *mnt;
-- 
2.11.0


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