Commit 6036dc03 authored by Joel Granados's avatar Joel Granados
Browse files

sysctl: Add CONFIG_PROC_SYSCTL guards for converter macros 



Wrap sysctl converter macros with CONFIG_PROC_SYSCTL conditional
compilation. When CONFIG_PROC_SYSCTL is disabled, provide stub
implementations that return -ENOSYS to prevent link errors while
maintaining API compatibility.

This ensures converter macros are only compiled when procfs sysctl
support is enabled in the kernel configuration.

Signed-off-by: default avatarJoel Granados <joel.granados@kernel.org>
parent ac3d6a4b

include/linux/sysctl.h

+43 −0
Original line number Diff line number Diff line
@@ -73,6 +73,7 @@ extern const int sysctl_vals[]; 
#define SYSCTL_USER_TO_KERN(dir) (!!(dir))

#define SYSCTL_KERN_TO_USER(dir) (!dir)



#ifdef CONFIG_PROC_SYSCTL

#define SYSCTL_USER_TO_KERN_INT_CONV(name, u_ptr_op)		\

int sysctl_user_to_kern_int_conv##name(const bool *negp,	\

				       const unsigned long *u_ptr,\
@@ -173,6 +174,48 @@ int do_proc_uint_conv##name(unsigned long *u_ptr, unsigned int *k_ptr, \ 
	return 0;							\

}



#else // CONFIG_PROC_SYSCTL

#define SYSCTL_USER_TO_KERN_INT_CONV(name, u_ptr_op)		\

int sysctl_user_to_kern_int_conv##name(const bool *negp,	\

				       const unsigned long *u_ptr,\

				       int *k_ptr)		\

{								\

	return -ENOSYS;						\

}



#define SYSCTL_KERN_TO_USER_INT_CONV(name, k_ptr_op)		\

int sysctl_kern_to_user_int_conv##name(bool *negp,		\

				       unsigned long *u_ptr,	\

				       const int *k_ptr)	\

{								\

	return -ENOSYS;						\

}



#define SYSCTL_INT_CONV_CUSTOM(name, user_to_kern, kern_to_user,	\

			       k_ptr_range_check)			\

int do_proc_int_conv##name(bool *negp, unsigned long *u_ptr, int *k_ptr,\

			   int dir, const struct ctl_table *tbl)	\

{									\

	return -ENOSYS;							\

}



#define SYSCTL_USER_TO_KERN_UINT_CONV(name, u_ptr_op)		\

int sysctl_user_to_kern_uint_conv##name(const unsigned long *u_ptr,\

					unsigned int *k_ptr)	\

{								\

	return -ENOSYS;						\

}



#define SYSCTL_UINT_CONV_CUSTOM(name, user_to_kern, kern_to_user,	\

				k_ptr_range_check)			\

int do_proc_uint_conv##name(unsigned long *u_ptr, unsigned int *k_ptr,	\

			   int dir, const struct ctl_table *tbl)	\

{									\

	return -ENOSYS;							\

}



#endif // CONFIG_PROC_SYSCTL





extern const unsigned long sysctl_long_vals[];