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mm: Make generic weak get_user_pages_fast and EXPORT_GPL it

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Out of line get_user_pages_fast fallback implementation, make it a weak
symbol, get rid of CONFIG_HAVE_GET_USER_PAGES_FAST.

Export the symbol to modules so lguest can use it.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2008-08-12 17:52:52 -05:00
parent 40c42076eb
commit 912985dce4
6 changed files with 16 additions and 29 deletions
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3
mm/Kconfig
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@ -77,9 +77,6 @@ config FLAT_NODE_MEM_MAP
def_bool y
depends on !SPARSEMEM
config HAVE_GET_USER_PAGES_FAST
bool
#
# Both the NUMA code and DISCONTIGMEM use arrays of pg_data_t's
# to represent different areas of memory. This variable allows

15
mm/util.c
View File

@ -171,3 +171,18 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
mm->unmap_area = arch_unmap_area;
}
#endif
int __attribute__((weak)) get_user_pages_fast(unsigned long start,
int nr_pages, int write, struct page **pages)
{
struct mm_struct *mm = current->mm;
int ret;
down_read(&mm->mmap_sem);
ret = get_user_pages(current, mm, start, nr_pages,
write, 0, pages, NULL);
up_read(&mm->mmap_sem);
return ret;
}
EXPORT_SYMBOL_GPL(get_user_pages_fast);