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mm/vmalloc: remove map_kernel_range
Patch series "mm/vmalloc: cleanup after hugepage series", v2. Christoph pointed out some overdue cleanups required after the huge vmalloc series, and I had another failure error message improvement as well. This patch (of 5): This is a shim around vmap_pages_range, get rid of it. Move the main API comment from the _noflush variant to the normal variant, and make _noflush internal to mm/. Link: https://lkml.kernel.org/r/20210322021806.892164-1-npiggin@gmail.com Link: https://lkml.kernel.org/r/20210322021806.892164-2-npiggin@gmail.com Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Uladzislau Rezki <urezki@gmail.com> Cc: Cédric Le Goater <clg@kaod.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -213,7 +213,7 @@ Here are the routines, one by one:
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there will be no entries in the cache for the kernel address
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space for virtual addresses in the range 'start' to 'end-1'.
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The first of these two routines is invoked after map_kernel_range()
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The first of these two routines is invoked after vmap_range()
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has installed the page table entries. The second is invoked
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before unmap_kernel_range() deletes the page table entries.
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@ -212,10 +212,6 @@ static inline bool is_vm_area_hugepages(const void *addr)
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int vmap_range(unsigned long addr, unsigned long end,
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phys_addr_t phys_addr, pgprot_t prot,
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unsigned int max_page_shift);
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extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
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pgprot_t prot, struct page **pages);
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int map_kernel_range(unsigned long start, unsigned long size, pgprot_t prot,
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struct page **pages);
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extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
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extern void unmap_kernel_range(unsigned long addr, unsigned long size);
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static inline void set_vm_flush_reset_perms(void *addr)
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@ -227,13 +223,6 @@ static inline void set_vm_flush_reset_perms(void *addr)
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}
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#else
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static inline int
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map_kernel_range_noflush(unsigned long start, unsigned long size,
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pgprot_t prot, struct page **pages)
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{
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return size >> PAGE_SHIFT;
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}
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#define map_kernel_range map_kernel_range_noflush
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static inline void
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unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
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{
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@ -637,4 +637,10 @@ struct migration_target_control {
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gfp_t gfp_mask;
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};
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/*
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* mm/vmalloc.c
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*/
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int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
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pgprot_t prot, struct page **pages, unsigned int page_shift);
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#endif /* __MM_INTERNAL_H */
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@ -8,6 +8,7 @@
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* Chunks are mapped into vmalloc areas and populated page by page.
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* This is the default chunk allocator.
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*/
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#include "internal.h"
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static struct page *pcpu_chunk_page(struct pcpu_chunk *chunk,
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unsigned int cpu, int page_idx)
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@ -192,8 +193,8 @@ static void pcpu_post_unmap_tlb_flush(struct pcpu_chunk *chunk,
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static int __pcpu_map_pages(unsigned long addr, struct page **pages,
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int nr_pages)
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{
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return map_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT,
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PAGE_KERNEL, pages);
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return vmap_pages_range_noflush(addr, addr + (nr_pages << PAGE_SHIFT),
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PAGE_KERNEL, pages, PAGE_SHIFT);
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}
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/**
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67
mm/vmalloc.c
67
mm/vmalloc.c
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@ -523,7 +523,16 @@ static int vmap_small_pages_range_noflush(unsigned long addr, unsigned long end,
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return 0;
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}
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static int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
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/*
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* vmap_pages_range_noflush is similar to vmap_pages_range, but does not
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* flush caches.
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*
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* The caller is responsible for calling flush_cache_vmap() after this
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* function returns successfully and before the addresses are accessed.
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*
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* This is an internal function only. Do not use outside mm/.
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*/
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int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
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pgprot_t prot, struct page **pages, unsigned int page_shift)
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{
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unsigned int i, nr = (end - addr) >> PAGE_SHIFT;
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@ -549,6 +558,18 @@ static int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
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return 0;
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}
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/**
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* vmap_pages_range - map pages to a kernel virtual address
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* @addr: start of the VM area to map
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* @end: end of the VM area to map (non-inclusive)
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* @prot: page protection flags to use
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* @pages: pages to map (always PAGE_SIZE pages)
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* @page_shift: maximum shift that the pages may be mapped with, @pages must
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* be aligned and contiguous up to at least this shift.
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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static int vmap_pages_range(unsigned long addr, unsigned long end,
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pgprot_t prot, struct page **pages, unsigned int page_shift)
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{
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@ -559,40 +580,6 @@ static int vmap_pages_range(unsigned long addr, unsigned long end,
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return err;
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}
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/**
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* map_kernel_range_noflush - map kernel VM area with the specified pages
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* @addr: start of the VM area to map
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* @size: size of the VM area to map
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* @prot: page protection flags to use
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* @pages: pages to map
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*
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* Map PFN_UP(@size) pages at @addr. The VM area @addr and @size specify should
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* have been allocated using get_vm_area() and its friends.
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*
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* NOTE:
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* This function does NOT do any cache flushing. The caller is responsible for
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* calling flush_cache_vmap() on to-be-mapped areas before calling this
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* function.
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int map_kernel_range_noflush(unsigned long addr, unsigned long size,
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pgprot_t prot, struct page **pages)
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{
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return vmap_pages_range_noflush(addr, addr + size, prot, pages, PAGE_SHIFT);
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}
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int map_kernel_range(unsigned long start, unsigned long size, pgprot_t prot,
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struct page **pages)
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{
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int ret;
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ret = map_kernel_range_noflush(start, size, prot, pages);
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flush_cache_vmap(start, start + size);
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return ret;
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}
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int is_vmalloc_or_module_addr(const void *x)
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{
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/*
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@ -2156,10 +2143,12 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node)
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kasan_unpoison_vmalloc(mem, size);
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if (map_kernel_range(addr, size, PAGE_KERNEL, pages) < 0) {
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if (vmap_pages_range(addr, addr + size, PAGE_KERNEL,
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pages, PAGE_SHIFT) < 0) {
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vm_unmap_ram(mem, count);
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return NULL;
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}
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return mem;
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}
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EXPORT_SYMBOL(vm_map_ram);
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@ -2703,6 +2692,7 @@ void *vmap(struct page **pages, unsigned int count,
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unsigned long flags, pgprot_t prot)
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{
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struct vm_struct *area;
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unsigned long addr;
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unsigned long size; /* In bytes */
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might_sleep();
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@ -2715,8 +2705,9 @@ void *vmap(struct page **pages, unsigned int count,
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if (!area)
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return NULL;
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if (map_kernel_range((unsigned long)area->addr, size, pgprot_nx(prot),
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pages) < 0) {
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addr = (unsigned long)area->addr;
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if (vmap_pages_range(addr, addr + size, pgprot_nx(prot),
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pages, PAGE_SHIFT) < 0) {
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vunmap(area->addr);
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return NULL;
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}
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