From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>

There are a couple of declarations that depend on CONFIG_MMU in
include/linux/vmalloc.h spread all over the file.

Group them all together to improve code readability.

No functional changes.

Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
---
 include/linux/vmalloc.h | 60 +++++++++++++++++------------------------
 1 file changed, 24 insertions(+), 36 deletions(-)

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index ad2ce7a6ab7a..9a012cd4fad2 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -134,12 +134,6 @@ extern void vm_unmap_ram(const void *mem, unsigned int count);
 extern void *vm_map_ram(struct page **pages, unsigned int count, int node);
 extern void vm_unmap_aliases(void);
 
-#ifdef CONFIG_MMU
-extern unsigned long vmalloc_nr_pages(void);
-#else
-static inline unsigned long vmalloc_nr_pages(void) { return 0; }
-#endif
-
 extern void *vmalloc_noprof(unsigned long size) __alloc_size(1);
 #define vmalloc(...)		alloc_hooks(vmalloc_noprof(__VA_ARGS__))
 
@@ -266,12 +260,29 @@ static inline bool is_vm_area_hugepages(const void *addr)
 #endif
 }
 
+/* for /proc/kcore */
+extern long vread_iter(struct iov_iter *iter, const char *addr, size_t count);
+
+/*
+ *	Internals.  Don't use..
+ */
+extern __init void vm_area_add_early(struct vm_struct *vm);
+extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
+
+int register_vmap_purge_notifier(struct notifier_block *nb);
+int unregister_vmap_purge_notifier(struct notifier_block *nb);
+
 #ifdef CONFIG_MMU
+#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
+
+extern unsigned long vmalloc_nr_pages(void);
+
 int vm_area_map_pages(struct vm_struct *area, unsigned long start,
 		      unsigned long end, struct page **pages);
 void vm_area_unmap_pages(struct vm_struct *area, unsigned long start,
 			 unsigned long end);
 void vunmap_range(unsigned long addr, unsigned long end);
+
 static inline void set_vm_flush_reset_perms(void *addr)
 {
 	struct vm_struct *vm = find_vm_area(addr);
@@ -279,24 +290,14 @@ static inline void set_vm_flush_reset_perms(void *addr)
 	if (vm)
 		vm->flags |= VM_FLUSH_RESET_PERMS;
 }
+#else  /* !CONFIG_MMU */
+#define VMALLOC_TOTAL 0UL
 
-#else
-static inline void set_vm_flush_reset_perms(void *addr)
-{
-}
-#endif
-
-/* for /proc/kcore */
-extern long vread_iter(struct iov_iter *iter, const char *addr, size_t count);
-
-/*
- *	Internals.  Don't use..
- */
-extern __init void vm_area_add_early(struct vm_struct *vm);
-extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
+static inline unsigned long vmalloc_nr_pages(void) { return 0; }
+static inline void set_vm_flush_reset_perms(void *addr) {}
+#endif /* CONFIG_MMU */
 
-#ifdef CONFIG_SMP
-# ifdef CONFIG_MMU
+#if defined(CONFIG_MMU) && defined(CONFIG_SMP)
 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
 				     const size_t *sizes, int nr_vms,
 				     size_t align);
@@ -311,22 +312,9 @@ pcpu_get_vm_areas(const unsigned long *offsets,
 	return NULL;
 }
 
-static inline void
-pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
-{
-}
-# endif
-#endif
-
-#ifdef CONFIG_MMU
-#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
-#else
-#define VMALLOC_TOTAL 0UL
+static inline void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) {}
 #endif
 
-int register_vmap_purge_notifier(struct notifier_block *nb);
-int unregister_vmap_purge_notifier(struct notifier_block *nb);
-
 #if defined(CONFIG_MMU) && defined(CONFIG_PRINTK)
 bool vmalloc_dump_obj(void *object);
 #else
-- 
2.43.0

On Wed, Oct 09, 2024 at 09:08:09PM +0300, Mike Rapoport wrote:
> +/* for /proc/kcore */
> +extern long vread_iter(struct iov_iter *iter, const char *addr, size_t count);
> +
> +/*
> + *	Internals.  Don't use..
> + */
> +extern __init void vm_area_add_early(struct vm_struct *vm);
> +extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);

Please drop the externs while you're at it. (one more down below)

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>