From b67177ecd956333029dbc1a4971a857fee0ccbb1 Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Thu, 29 Apr 2021 22:58:53 -0700 Subject: mm/vmalloc: remove map_kernel_range MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Christoph Hellwig Cc: Uladzislau Rezki Cc: Cédric Le Goater Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/internal.h | 6 ++++++ mm/percpu-vm.c | 5 +++-- mm/vmalloc.c | 65 +++++++++++++++++++++++++--------------------------------- 3 files changed, 37 insertions(+), 39 deletions(-) (limited to 'mm') diff --git a/mm/internal.h b/mm/internal.h index bbe900f9f095..58c3757c52d9 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -637,4 +637,10 @@ struct migration_target_control { gfp_t gfp_mask; }; +/* + * mm/vmalloc.c + */ +int vmap_pages_range_noflush(unsigned long addr, unsigned long end, + pgprot_t prot, struct page **pages, unsigned int page_shift); + #endif /* __MM_INTERNAL_H */ diff --git a/mm/percpu-vm.c b/mm/percpu-vm.c index e46f7a6917f9..88a53eb68a94 100644 --- a/mm/percpu-vm.c +++ b/mm/percpu-vm.c @@ -8,6 +8,7 @@ * Chunks are mapped into vmalloc areas and populated page by page. * This is the default chunk allocator. */ +#include "internal.h" static struct page *pcpu_chunk_page(struct pcpu_chunk *chunk, unsigned int cpu, int page_idx) @@ -192,8 +193,8 @@ static void pcpu_post_unmap_tlb_flush(struct pcpu_chunk *chunk, static int __pcpu_map_pages(unsigned long addr, struct page **pages, int nr_pages) { - return map_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT, - PAGE_KERNEL, pages); + return vmap_pages_range_noflush(addr, addr + (nr_pages << PAGE_SHIFT), + PAGE_KERNEL, pages, PAGE_SHIFT); } /** diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 59c815eb7e74..527781a3a0fe 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -523,7 +523,16 @@ static int vmap_small_pages_range_noflush(unsigned long addr, unsigned long end, return 0; } -static int vmap_pages_range_noflush(unsigned long addr, unsigned long end, +/* + * vmap_pages_range_noflush is similar to vmap_pages_range, but does not + * flush caches. + * + * The caller is responsible for calling flush_cache_vmap() after this + * function returns successfully and before the addresses are accessed. + * + * This is an internal function only. Do not use outside mm/. + */ +int vmap_pages_range_noflush(unsigned long addr, unsigned long end, pgprot_t prot, struct page **pages, unsigned int page_shift) { unsigned int i, nr = (end - addr) >> PAGE_SHIFT; @@ -549,48 +558,26 @@ static int vmap_pages_range_noflush(unsigned long addr, unsigned long end, return 0; } -static int vmap_pages_range(unsigned long addr, unsigned long end, - pgprot_t prot, struct page **pages, unsigned int page_shift) -{ - int err; - - err = vmap_pages_range_noflush(addr, end, prot, pages, page_shift); - flush_cache_vmap(addr, end); - return err; -} - /** - * map_kernel_range_noflush - map kernel VM area with the specified pages + * vmap_pages_range - map pages to a kernel virtual address * @addr: start of the VM area to map - * @size: size of the VM area to map + * @end: end of the VM area to map (non-inclusive) * @prot: page protection flags to use - * @pages: pages to map - * - * Map PFN_UP(@size) pages at @addr. The VM area @addr and @size specify should - * have been allocated using get_vm_area() and its friends. - * - * NOTE: - * This function does NOT do any cache flushing. The caller is responsible for - * calling flush_cache_vmap() on to-be-mapped areas before calling this - * function. + * @pages: pages to map (always PAGE_SIZE pages) + * @page_shift: maximum shift that the pages may be mapped with, @pages must + * be aligned and contiguous up to at least this shift. * * RETURNS: * 0 on success, -errno on failure. */ -int map_kernel_range_noflush(unsigned long addr, unsigned long size, - pgprot_t prot, struct page **pages) -{ - return vmap_pages_range_noflush(addr, addr + size, prot, pages, PAGE_SHIFT); -} - -int map_kernel_range(unsigned long start, unsigned long size, pgprot_t prot, - struct page **pages) +static int vmap_pages_range(unsigned long addr, unsigned long end, + pgprot_t prot, struct page **pages, unsigned int page_shift) { - int ret; + int err; - ret = map_kernel_range_noflush(start, size, prot, pages); - flush_cache_vmap(start, start + size); - return ret; + err = vmap_pages_range_noflush(addr, end, prot, pages, page_shift); + flush_cache_vmap(addr, end); + return err; } int is_vmalloc_or_module_addr(const void *x) @@ -2156,10 +2143,12 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node) kasan_unpoison_vmalloc(mem, size); - if (map_kernel_range(addr, size, PAGE_KERNEL, pages) < 0) { + if (vmap_pages_range(addr, addr + size, PAGE_KERNEL, + pages, PAGE_SHIFT) < 0) { vm_unmap_ram(mem, count); return NULL; } + return mem; } EXPORT_SYMBOL(vm_map_ram); @@ -2703,6 +2692,7 @@ void *vmap(struct page **pages, unsigned int count, unsigned long flags, pgprot_t prot) { struct vm_struct *area; + unsigned long addr; unsigned long size; /* In bytes */ might_sleep(); @@ -2715,8 +2705,9 @@ void *vmap(struct page **pages, unsigned int count, if (!area) return NULL; - if (map_kernel_range((unsigned long)area->addr, size, pgprot_nx(prot), - pages) < 0) { + addr = (unsigned long)area->addr; + if (vmap_pages_range(addr, addr + size, pgprot_nx(prot), + pages, PAGE_SHIFT) < 0) { vunmap(area->addr); return NULL; } -- cgit v1.2.3