Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 06090e8e authored by David S. Miller's avatar David S. Miller
Browse files

sparc64: Implement __get_user_pages_fast(). 



It is not sufficient to only implement get_user_pages_fast(), you
must also implement the atomic version __get_user_pages_fast()
otherwise you end up using the weak symbol fallback implementation
which simply returns zero.

This is dangerous, because it causes the futex code to loop forever
if transparent hugepages are supported (see get_futex_key()).

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ef3e035c

arch/sparc/mm/gup.c

+30 −0
Original line number Original line Diff line number Diff line
@@ -160,6 +160,36 @@ static int gup_pud_range(pgd_t pgd, unsigned long addr, unsigned long end, 
	return 1;

	return 1;

}

}





int __get_user_pages_fast(unsigned long start, int nr_pages, int write,

			  struct page **pages)

{

	struct mm_struct *mm = current->mm;

	unsigned long addr, len, end;

	unsigned long next, flags;

	pgd_t *pgdp;

	int nr = 0;



	start &= PAGE_MASK;

	addr = start;

	len = (unsigned long) nr_pages << PAGE_SHIFT;

	end = start + len;



	local_irq_save(flags);

	pgdp = pgd_offset(mm, addr);

	do {

		pgd_t pgd = *pgdp;



		next = pgd_addr_end(addr, end);

		if (pgd_none(pgd))

			break;

		if (!gup_pud_range(pgd, addr, next, write, pages, &nr))

			break;

	} while (pgdp++, addr = next, addr != end);

	local_irq_restore(flags);



	return nr;

}



int get_user_pages_fast(unsigned long start, int nr_pages, int write,

int get_user_pages_fast(unsigned long start, int nr_pages, int write,

			struct page **pages)

			struct page **pages)

{

{