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![Michal Hocko](/assets/img/avatar_default.png)
Commit1f5307b1e0
("mm, vmalloc: properly track vmalloc users") has pulled asm/pgtable.h include dependency to linux/vmalloc.h and that turned out to be a bad idea for some architectures. E.g. m68k fails with In file included from arch/m68k/include/asm/pgtable_mm.h:145:0, from arch/m68k/include/asm/pgtable.h:4, from include/linux/vmalloc.h:9, from arch/m68k/kernel/module.c:9: arch/m68k/include/asm/mcf_pgtable.h: In function 'nocache_page': >> arch/m68k/include/asm/mcf_pgtable.h:339:43: error: 'init_mm' undeclared (first use in this function) #define pgd_offset_k(address) pgd_offset(&init_mm, address) as spotted by kernel build bot. nios2 fails for other reason In file included from include/asm-generic/io.h:767:0, from arch/nios2/include/asm/io.h:61, from include/linux/io.h:25, from arch/nios2/include/asm/pgtable.h:18, from include/linux/mm.h:70, from include/linux/pid_namespace.h:6, from include/linux/ptrace.h:9, from arch/nios2/include/uapi/asm/elf.h:23, from arch/nios2/include/asm/elf.h:22, from include/linux/elf.h:4, from include/linux/module.h:15, from init/main.c:16: include/linux/vmalloc.h: In function '__vmalloc_node_flags': include/linux/vmalloc.h:99:40: error: 'PAGE_KERNEL' undeclared (first use in this function); did you mean 'GFP_KERNEL'? which is due to the newly added #include <asm/pgtable.h>, which on nios2 includes <linux/io.h> and thus <asm/io.h> and <asm-generic/io.h> which again includes <linux/vmalloc.h>. Tweaking that around just turns out a bigger headache than necessary. This patch reverts1f5307b1e0
and reimplements the original fix in a different way. __vmalloc_node_flags can stay static inline which will cover vmalloc* functions. We only have one external user (kvmalloc_node) and we can export __vmalloc_node_flags_caller and provide the caller directly. This is much simpler and it doesn't really need any games with header files. [akpm@linux-foundation.org: coding-style fixes] [mhocko@kernel.org: revert old comment] Link: http://lkml.kernel.org/r/20170509211054.GB16325@dhcp22.suse.cz Fixes:1f5307b1e0
("mm, vmalloc: properly track vmalloc users") Link: http://lkml.kernel.org/r/20170509153702.GR6481@dhcp22.suse.cz Signed-off-by: Michal Hocko <mhocko@suse.com> Cc: Tobias Klauser <tklauser@distanz.ch> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
207 lines
6.2 KiB
C
207 lines
6.2 KiB
C
#ifndef _LINUX_VMALLOC_H
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#define _LINUX_VMALLOC_H
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#include <linux/spinlock.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/llist.h>
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#include <asm/page.h> /* pgprot_t */
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#include <linux/rbtree.h>
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struct vm_area_struct; /* vma defining user mapping in mm_types.h */
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struct notifier_block; /* in notifier.h */
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/* bits in flags of vmalloc's vm_struct below */
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#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
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#define VM_ALLOC 0x00000002 /* vmalloc() */
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#define VM_MAP 0x00000004 /* vmap()ed pages */
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#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
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#define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
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#define VM_NO_GUARD 0x00000040 /* don't add guard page */
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#define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
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/* bits [20..32] reserved for arch specific ioremap internals */
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/*
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* Maximum alignment for ioremap() regions.
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* Can be overriden by arch-specific value.
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*/
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#ifndef IOREMAP_MAX_ORDER
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#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
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#endif
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struct vm_struct {
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struct vm_struct *next;
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void *addr;
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unsigned long size;
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unsigned long flags;
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struct page **pages;
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unsigned int nr_pages;
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phys_addr_t phys_addr;
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const void *caller;
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};
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struct vmap_area {
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unsigned long va_start;
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unsigned long va_end;
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unsigned long flags;
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struct rb_node rb_node; /* address sorted rbtree */
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struct list_head list; /* address sorted list */
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struct llist_node purge_list; /* "lazy purge" list */
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struct vm_struct *vm;
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struct rcu_head rcu_head;
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};
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/*
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* Highlevel APIs for driver use
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*/
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extern void vm_unmap_ram(const void *mem, unsigned int count);
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extern void *vm_map_ram(struct page **pages, unsigned int count,
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int node, pgprot_t prot);
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extern void vm_unmap_aliases(void);
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#ifdef CONFIG_MMU
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extern void __init vmalloc_init(void);
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#else
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static inline void vmalloc_init(void)
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{
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}
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#endif
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extern void *vmalloc(unsigned long size);
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extern void *vzalloc(unsigned long size);
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extern void *vmalloc_user(unsigned long size);
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extern void *vmalloc_node(unsigned long size, int node);
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extern void *vzalloc_node(unsigned long size, int node);
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extern void *vmalloc_exec(unsigned long size);
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extern void *vmalloc_32(unsigned long size);
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extern void *vmalloc_32_user(unsigned long size);
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extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
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extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
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unsigned long start, unsigned long end, gfp_t gfp_mask,
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pgprot_t prot, unsigned long vm_flags, int node,
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const void *caller);
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#ifndef CONFIG_MMU
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extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags);
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static inline void *__vmalloc_node_flags_caller(unsigned long size, int node,
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gfp_t flags, void *caller)
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{
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return __vmalloc_node_flags(size, node, flags);
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}
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#else
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extern void *__vmalloc_node_flags_caller(unsigned long size,
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int node, gfp_t flags, void *caller);
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#endif
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extern void vfree(const void *addr);
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extern void vfree_atomic(const void *addr);
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extern void *vmap(struct page **pages, unsigned int count,
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unsigned long flags, pgprot_t prot);
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extern void vunmap(const void *addr);
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extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
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unsigned long uaddr, void *kaddr,
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unsigned long size);
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extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
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unsigned long pgoff);
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void vmalloc_sync_all(void);
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/*
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* Lowlevel-APIs (not for driver use!)
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*/
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static inline size_t get_vm_area_size(const struct vm_struct *area)
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{
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if (!(area->flags & VM_NO_GUARD))
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/* return actual size without guard page */
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return area->size - PAGE_SIZE;
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else
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return area->size;
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}
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extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
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extern struct vm_struct *get_vm_area_caller(unsigned long size,
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unsigned long flags, const void *caller);
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extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
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unsigned long start, unsigned long end);
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extern struct vm_struct *__get_vm_area_caller(unsigned long size,
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unsigned long flags,
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unsigned long start, unsigned long end,
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const void *caller);
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extern struct vm_struct *remove_vm_area(const void *addr);
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extern struct vm_struct *find_vm_area(const void *addr);
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extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
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struct page **pages);
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#ifdef CONFIG_MMU
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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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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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#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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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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}
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static inline void
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unmap_kernel_range(unsigned long addr, unsigned long size)
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{
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}
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#endif
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/* Allocate/destroy a 'vmalloc' VM area. */
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extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
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extern void free_vm_area(struct vm_struct *area);
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/* for /dev/kmem */
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extern long vread(char *buf, char *addr, unsigned long count);
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extern long vwrite(char *buf, char *addr, unsigned long count);
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/*
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* Internals. Dont't use..
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*/
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extern struct list_head vmap_area_list;
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extern __init void vm_area_add_early(struct vm_struct *vm);
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extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
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#ifdef CONFIG_SMP
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# ifdef CONFIG_MMU
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struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
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const size_t *sizes, int nr_vms,
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size_t align);
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void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
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# else
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static inline struct vm_struct **
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pcpu_get_vm_areas(const unsigned long *offsets,
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const size_t *sizes, int nr_vms,
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size_t align)
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{
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return NULL;
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}
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static inline void
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pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
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{
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}
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# endif
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#endif
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#ifdef CONFIG_MMU
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#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
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#else
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#define VMALLOC_TOTAL 0UL
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#endif
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int register_vmap_purge_notifier(struct notifier_block *nb);
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int unregister_vmap_purge_notifier(struct notifier_block *nb);
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#endif /* _LINUX_VMALLOC_H */
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