cxl: Fix build when CONFIG_DEBUG_FS=n

Stub out the debugfs functions so that the build doesn't break when
CONFIG_DEBUG_FS=n.

Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

drivers/misc/cxl/Makefile

@@ -2,9 +2,10 @@ ccflags-y			:= $(call cc-disable-warning, unused-const-variable)
 ccflags-$(CONFIG_PPC_WERROR)	+= -Werror
 
 cxl-y				+= main.o file.o irq.o fault.o native.o
-cxl-y				+= context.o sysfs.o debugfs.o pci.o trace.o
+cxl-y				+= context.o sysfs.o pci.o trace.o
 cxl-y				+= vphb.o phb.o api.o
 cxl-$(CONFIG_PPC_PSERIES)	+= flash.o guest.o of.o hcalls.o
+cxl-$(CONFIG_DEBUG_FS)		+= debugfs.o
 obj-$(CONFIG_CXL)		+= cxl.o
 obj-$(CONFIG_CXL_BASE)		+= base.o
 

drivers/misc/cxl/cxl.h

@@ -802,12 +802,67 @@ int afu_register_irqs(struct cxl_context *ctx, u32 count);
 void afu_release_irqs(struct cxl_context *ctx, void *cookie);
 void afu_irq_name_free(struct cxl_context *ctx);
 
+#ifdef CONFIG_DEBUG_FS
+
 int cxl_debugfs_init(void);
 void cxl_debugfs_exit(void);
 int cxl_debugfs_adapter_add(struct cxl *adapter);
 void cxl_debugfs_adapter_remove(struct cxl *adapter);
 int cxl_debugfs_afu_add(struct cxl_afu *afu);
 void cxl_debugfs_afu_remove(struct cxl_afu *afu);
+void cxl_stop_trace(struct cxl *cxl);
+void cxl_debugfs_add_adapter_psl_regs(struct cxl *adapter, struct dentry *dir);
+void cxl_debugfs_add_adapter_xsl_regs(struct cxl *adapter, struct dentry *dir);
+void cxl_debugfs_add_afu_psl_regs(struct cxl_afu *afu, struct dentry *dir);
+
+#else /* CONFIG_DEBUG_FS */
+
+static inline int __init cxl_debugfs_init(void)
+{
+	return 0;
+}
+
+static inline void cxl_debugfs_exit(void)
+{
+}
+
+static inline int cxl_debugfs_adapter_add(struct cxl *adapter)
+{
+	return 0;
+}
+
+static inline void cxl_debugfs_adapter_remove(struct cxl *adapter)
+{
+}
+
+static inline int cxl_debugfs_afu_add(struct cxl_afu *afu)
+{
+	return 0;
+}
+
+static inline void cxl_debugfs_afu_remove(struct cxl_afu *afu)
+{
+}
+
+static inline void cxl_stop_trace(struct cxl *cxl)
+{
+}
+
+static inline void cxl_debugfs_add_adapter_psl_regs(struct cxl *adapter,
+						    struct dentry *dir)
+{
+}
+
+static inline void cxl_debugfs_add_adapter_xsl_regs(struct cxl *adapter,
+						    struct dentry *dir)
+{
+}
+
+static inline void cxl_debugfs_add_afu_psl_regs(struct cxl_afu *afu, struct dentry *dir)
+{
+}
+
+#endif /* CONFIG_DEBUG_FS */
 
 void cxl_handle_fault(struct work_struct *work);
 void cxl_prefault(struct cxl_context *ctx, u64 wed);
@@ -872,12 +927,8 @@ int cxl_data_cache_flush(struct cxl *adapter);
 int cxl_afu_disable(struct cxl_afu *afu);
 int cxl_psl_purge(struct cxl_afu *afu);
 
-void cxl_debugfs_add_adapter_psl_regs(struct cxl *adapter, struct dentry *dir);
-void cxl_debugfs_add_adapter_xsl_regs(struct cxl *adapter, struct dentry *dir);
-void cxl_debugfs_add_afu_psl_regs(struct cxl_afu *afu, struct dentry *dir);
 void cxl_native_psl_irq_dump_regs(struct cxl_context *ctx);
 void cxl_native_err_irq_dump_regs(struct cxl *adapter);
-void cxl_stop_trace(struct cxl *cxl);
 int cxl_pci_vphb_add(struct cxl_afu *afu);
 void cxl_pci_vphb_remove(struct cxl_afu *afu);
 void cxl_release_mapping(struct cxl_context *ctx);