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Commit 6f89dbce authored by Sowmini Varadhan's avatar Sowmini Varadhan Committed by David S. Miller
Browse files

skbuff: export mm_[un]account_pinned_pages for other modules 



RDS would like to use the helper functions for managing pinned pages
added by Commit a91dbff5 ("sock: ulimit on MSG_ZEROCOPY pages")

Signed-off-by: default avatarSowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ee99b2d8

include/linux/skbuff.h

+3 −0
Original line number Diff line number Diff line
@@ -466,6 +466,9 @@ struct ubuf_info { 


#define skb_uarg(SKB)	((struct ubuf_info *)(skb_shinfo(SKB)->destructor_arg))



int mm_account_pinned_pages(struct mmpin *mmp, size_t size);

void mm_unaccount_pinned_pages(struct mmpin *mmp);



struct ubuf_info *sock_zerocopy_alloc(struct sock *sk, size_t size);

struct ubuf_info *sock_zerocopy_realloc(struct sock *sk, size_t size,

					struct ubuf_info *uarg);

net/core/skbuff.c

+4 −2
Original line number Diff line number Diff line
@@ -890,7 +890,7 @@ struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src) 
}

EXPORT_SYMBOL_GPL(skb_morph);



static int mm_account_pinned_pages(struct mmpin *mmp, size_t size)

int mm_account_pinned_pages(struct mmpin *mmp, size_t size)

{

	unsigned long max_pg, num_pg, new_pg, old_pg;

	struct user_struct *user;
@@ -919,14 +919,16 @@ static int mm_account_pinned_pages(struct mmpin *mmp, size_t size) 


	return 0;

}

EXPORT_SYMBOL_GPL(mm_account_pinned_pages);



static void mm_unaccount_pinned_pages(struct mmpin *mmp)

void mm_unaccount_pinned_pages(struct mmpin *mmp)

{

	if (mmp->user) {

		atomic_long_sub(mmp->num_pg, &mmp->user->locked_vm);

		free_uid(mmp->user);

	}

}

EXPORT_SYMBOL_GPL(mm_unaccount_pinned_pages);



struct ubuf_info *sock_zerocopy_alloc(struct sock *sk, size_t size)

{