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Commit b5073173 authored by Paul Mundt's avatar Paul Mundt Committed by Linus Torvalds
Browse files

nommu: vmalloc_32_user()/vm_insert_page() and symbol exports. 



Trying to survive an allmodconfig on a nommu platform results in many
screen lengths of module unhappiness.  Many of the mmap related things that
binfmt_flat hooks in to are never exported despite being global, and there
are also missing definitions for vmalloc_32_user() and vm_insert_page().

I've implemented vmalloc_32_user() trying to stick as close to the
mm/vmalloc.c implementation as possible, though we don't have any need for
VM_USERMAP, so groveling for the VMA can be skipped.  vm_insert_page() has
been stubbed for now in order to keep the build happy.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent df336d1c

mm/nommu.c

+33 −12
Original line number Diff line number Diff line
@@ -54,12 +54,6 @@ DECLARE_RWSEM(nommu_vma_sem); 
struct vm_operations_struct generic_file_vm_ops = {

};



EXPORT_SYMBOL(vfree);

EXPORT_SYMBOL(vmalloc_to_page);

EXPORT_SYMBOL(vmalloc_32);

EXPORT_SYMBOL(vmap);

EXPORT_SYMBOL(vunmap);



/*

 * Handle all mappings that got truncated by a "truncate()"

 * system call.
@@ -168,7 +162,6 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, 
finish_or_fault:

	return i ? : -EFAULT;

}



EXPORT_SYMBOL(get_user_pages);



DEFINE_RWLOCK(vmlist_lock);
@@ -178,6 +171,7 @@ void vfree(void *addr) 
{

	kfree(addr);

}

EXPORT_SYMBOL(vfree);



void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot)

{
@@ -186,17 +180,19 @@ void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot) 
	 */

	return kmalloc(size, (gfp_mask | __GFP_COMP) & ~__GFP_HIGHMEM);

}

EXPORT_SYMBOL(__vmalloc);



struct page * vmalloc_to_page(void *addr)

{

	return virt_to_page(addr);

}

EXPORT_SYMBOL(vmalloc_to_page);



unsigned long vmalloc_to_pfn(void *addr)

{

	return page_to_pfn(virt_to_page(addr));

}



EXPORT_SYMBOL(vmalloc_to_pfn);



long vread(char *buf, char *addr, unsigned long count)

{
@@ -237,9 +233,8 @@ void *vmalloc_node(unsigned long size, int node) 
}

EXPORT_SYMBOL(vmalloc_node);



/*

 *	vmalloc_32  -  allocate virtually continguos memory (32bit addressable)

 *

/**

 * vmalloc_32  -  allocate virtually contiguous memory (32bit addressable)

 *	@size:		allocation size

 *

 *	Allocate enough 32bit PA addressable pages to cover @size from the
@@ -249,17 +244,33 @@ void *vmalloc_32(unsigned long size) 
{

	return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL);

}

EXPORT_SYMBOL(vmalloc_32);



/**

 * vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory

 *	@size:		allocation size

 *

 * The resulting memory area is 32bit addressable and zeroed so it can be

 * mapped to userspace without leaking data.

 */

void *vmalloc_32_user(unsigned long size)

{

	return __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);

}

EXPORT_SYMBOL(vmalloc_32_user);



void *vmap(struct page **pages, unsigned int count, unsigned long flags, pgprot_t prot)

{

	BUG();

	return NULL;

}

EXPORT_SYMBOL(vmap);



void vunmap(void *addr)

{

	BUG();

}

EXPORT_SYMBOL(vunmap);



/*

 * Implement a stub for vmalloc_sync_all() if the architecture chose not to
@@ -269,6 +280,13 @@ void __attribute__((weak)) vmalloc_sync_all(void) 
{

}



int vm_insert_page(struct vm_area_struct *vma, unsigned long addr,

		   struct page *page)

{

	return -EINVAL;

}

EXPORT_SYMBOL(vm_insert_page);



/*

 *  sys_brk() for the most part doesn't need the global kernel

 *  lock, except when an application is doing something nasty
@@ -994,6 +1012,7 @@ unsigned long do_mmap_pgoff(struct file *file, 
	show_free_areas();

	return -ENOMEM;

}

EXPORT_SYMBOL(do_mmap_pgoff);



/*

 * handle mapping disposal for uClinux
@@ -1074,6 +1093,7 @@ int do_munmap(struct mm_struct *mm, unsigned long addr, size_t len) 


	return 0;

}

EXPORT_SYMBOL(do_munmap);



asmlinkage long sys_munmap(unsigned long addr, size_t len)

{
@@ -1164,6 +1184,7 @@ unsigned long do_mremap(unsigned long addr, 


	return vma->vm_start;

}

EXPORT_SYMBOL(do_mremap);



asmlinkage unsigned long sys_mremap(unsigned long addr,

	unsigned long old_len, unsigned long new_len,
@@ -1231,7 +1252,6 @@ unsigned long get_unmapped_area(struct file *file, unsigned long addr, 


	return get_area(file, addr, len, pgoff, flags);

}



EXPORT_SYMBOL(get_unmapped_area);



/*
@@ -1346,6 +1366,7 @@ int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 
	BUG();

	return 0;

}

EXPORT_SYMBOL(filemap_fault);



/*

 * Access another process' address space.