[patch 104/128] mm: remove map_vm_range

[Andrew Morton <akpm@linux-foundation.org>]

From: Christoph Hellwig <hch@lst.de>
Subject: mm: remove map_vm_range

Switch all callers to map_kernel_range, which symmetric to the unmap side
(as well as the _noflush versions).

Link: http://lkml.kernel.org/r/20200414131348.444715-17-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Cc: Gao Xiang <xiang@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Kelley <mikelley@microsoft.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 Documentation/core-api/cachetlb.rst |    2 +-
 include/linux/vmalloc.h             |   10 ++++------
 mm/vmalloc.c                        |   21 +++++++--------------
 mm/zsmalloc.c                       |    4 +++-
 net/ceph/ceph_common.c              |    3 +--
 5 files changed, 16 insertions(+), 24 deletions(-)

--- a/Documentation/core-api/cachetlb.rst~mm-remove-map_vm_range
+++ a/Documentation/core-api/cachetlb.rst
@@ -213,7 +213,7 @@ Here are the routines, one by one:
 	there will be no entries in the cache for the kernel address
 	space for virtual addresses in the range 'start' to 'end-1'.
 
-	The first of these two routines is invoked after map_vm_area()
+	The first of these two routines is invoked after map_kernel_range()
 	has installed the page table entries.  The second is invoked
 	before unmap_kernel_range() deletes the page table entries.
 
--- a/include/linux/vmalloc.h~mm-remove-map_vm_range
+++ a/include/linux/vmalloc.h
@@ -168,11 +168,11 @@ extern struct vm_struct *__get_vm_area_c
 extern struct vm_struct *remove_vm_area(const void *addr);
 extern struct vm_struct *find_vm_area(const void *addr);
 
-extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
-			struct page **pages);
 #ifdef CONFIG_MMU
 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
 				    pgprot_t prot, struct page **pages);
+int map_kernel_range(unsigned long start, unsigned long size, pgprot_t prot,
+		struct page **pages);
 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
 static inline void set_vm_flush_reset_perms(void *addr)
@@ -189,14 +189,12 @@ map_kernel_range_noflush(unsigned long s
 {
 	return size >> PAGE_SHIFT;
 }
+#define map_kernel_range map_kernel_range_noflush
 static inline void
 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
 {
 }
-static inline void
-unmap_kernel_range(unsigned long addr, unsigned long size)
-{
-}
+#define unmap_kernel_range unmap_kernel_range_noflush
 static inline void set_vm_flush_reset_perms(void *addr)
 {
 }
--- a/mm/vmalloc.c~mm-remove-map_vm_range
+++ a/mm/vmalloc.c
@@ -273,8 +273,8 @@ int map_kernel_range_noflush(unsigned lo
 	return 0;
 }
 
-static int map_kernel_range(unsigned long start, unsigned long size,
-			   pgprot_t prot, struct page **pages)
+int map_kernel_range(unsigned long start, unsigned long size, pgprot_t prot,
+		struct page **pages)
 {
 	int ret;
 
@@ -2028,16 +2028,6 @@ void unmap_kernel_range(unsigned long ad
 	flush_tlb_kernel_range(addr, end);
 }
 
-int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page **pages)
-{
-	unsigned long addr = (unsigned long)area->addr;
-	int err;
-
-	err = map_kernel_range(addr, get_vm_area_size(area), prot, pages);
-
-	return err > 0 ? 0 : err;
-}
-
 static inline void setup_vmalloc_vm_locked(struct vm_struct *vm,
 	struct vmap_area *va, unsigned long flags, const void *caller)
 {
@@ -2409,7 +2399,8 @@ void *vmap(struct page **pages, unsigned
 	if (!area)
 		return NULL;
 
-	if (map_vm_area(area, prot, pages)) {
+	if (map_kernel_range((unsigned long)area->addr, size, prot,
+			pages) < 0) {
 		vunmap(area->addr);
 		return NULL;
 	}
@@ -2472,8 +2463,10 @@ static void *__vmalloc_area_node(struct
 	}
 	atomic_long_add(area->nr_pages, &nr_vmalloc_pages);
 
-	if (map_vm_area(area, prot, pages))
+	if (map_kernel_range((unsigned long)area->addr, get_vm_area_size(area),
+			prot, pages) < 0)
 		goto fail;
+
 	return area->addr;
 
 fail:
--- a/mm/zsmalloc.c~mm-remove-map_vm_range
+++ a/mm/zsmalloc.c
@@ -1138,7 +1138,9 @@ static inline void __zs_cpu_down(struct
 static inline void *__zs_map_object(struct mapping_area *area,
 				struct page *pages[2], int off, int size)
 {
-	BUG_ON(map_vm_area(area->vm, PAGE_KERNEL, pages));
+	unsigned long addr = (unsigned long)area->vm->addr;
+
+	BUG_ON(map_kernel_range(addr, PAGE_SIZE * 2, PAGE_KERNEL, pages) < 0);
 	area->vm_addr = area->vm->addr;
 	return area->vm_addr + off;
 }
--- a/net/ceph/ceph_common.c~mm-remove-map_vm_range
+++ a/net/ceph/ceph_common.c
@@ -190,8 +190,7 @@ EXPORT_SYMBOL(ceph_compare_options);
  * kvmalloc() doesn't fall back to the vmalloc allocator unless flags are
  * compatible with (a superset of) GFP_KERNEL.  This is because while the
  * actual pages are allocated with the specified flags, the page table pages
- * are always allocated with GFP_KERNEL.  map_vm_area() doesn't even take
- * flags because GFP_KERNEL is hard-coded in {p4d,pud,pmd,pte}_alloc().
+ * are always allocated with GFP_KERNEL.
  *
  * ceph_kvmalloc() may be called with GFP_KERNEL, GFP_NOFS or GFP_NOIO.
  */
_