ftrace: let ftrace_enable_sysctl take a kernel pointer buffer

Commit 32927393dc1c ("sysctl: pass kernel pointers to ->proc_handler")
changed ctl_table.proc_handler to take a kernel pointer.  Adjust the
signature of ftrace_enable_sysctl to match ctl_table.proc_handler which
fixes the following sparse warning:

kernel/trace/ftrace.c:7544:43: warning: incorrect type in argument 3 (different address spaces)
kernel/trace/ftrace.c:7544:43:    expected void *
kernel/trace/ftrace.c:7544:43:    got void [noderef] __user *buffer

Fixes: 32927393dc1c ("sysctl: pass kernel pointers to ->proc_handler")
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lkml.kernel.org/r/20200907093207.13540-1-tklauser@distanz.ch
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index ce2c06f72e863f0271a04e8f0e428d8f0d3ee3f2..e5c2d5cc6e6ad74cde812be7d7e95e756184e9d5 100644 (file)
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -85,8 +85,7 @@ static inline int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *val
 extern int ftrace_enabled;
 extern int
 ftrace_enable_sysctl(struct ctl_table *table, int write,
-                    void __user *buffer, size_t *lenp,
-                    loff_t *ppos);
+                    void *buffer, size_t *lenp, loff_t *ppos);
 
 struct ftrace_ops;
 

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 275441254bb57b69591b6407067aeea6491e2a06..e9fa580f3083a11f1d53f42575de64a6fb89dce3 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -7531,8 +7531,7 @@ static bool is_permanent_ops_registered(void)
 
 int
 ftrace_enable_sysctl(struct ctl_table *table, int write,
-                    void __user *buffer, size_t *lenp,
-                    loff_t *ppos)
+                    void *buffer, size_t *lenp, loff_t *ppos)
 {
        int ret = -ENODEV;