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| author |   David S. Miller <davem@davemloft.net> | 2009-05-18 21:08:20 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-05-18 21:08:20 -0700 |
| commit | bb803cfbecb03a0cf8dc7e1864f18dda6631af00 (patch) | |
| tree | 6c0989693bea6f50cfa5c6bb14f52ec19668def3 /mm/util.c | |
| parent | The patch adds support for the PCI cards: PCIcan and PCIcanx (1, 2 or 4 channel) from Kvaser (http://www.kvaser.com). (diff) | |
| parent | pkt_sched: gen_estimator: use 64 bit intermediate counters for bps (diff) | |
| download | wireguard-linux-bb803cfbecb03a0cf8dc7e1864f18dda6631af00.tar.xz wireguard-linux-bb803cfbecb03a0cf8dc7e1864f18dda6631af00.zip | |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Conflicts:
drivers/scsi/fcoe/fcoe.c
Diffstat (limited to 'mm/util.c')
| -rw-r--r-- | mm/util.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c index 2599e83eea17..55bef160b9f1 100644 --- a/mm/util.c +++ b/mm/util.c @@ -223,6 +223,22 @@ void arch_pick_mmap_layout(struct mm_struct *mm) } #endif +/** + * get_user_pages_fast() - pin user pages in memory + * @start: starting user address + * @nr_pages: number of pages from start to pin + * @write: whether pages will be written to + * @pages: array that receives pointers to the pages pinned. + * Should be at least nr_pages long. + * + * Attempt to pin user pages in memory without taking mm->mmap_sem. + * If not successful, it will fall back to taking the lock and + * calling get_user_pages(). + * + * Returns number of pages pinned. This may be fewer than the number + * requested. If nr_pages is 0 or negative, returns 0. If no pages + * were pinned, returns -errno. + */ int __attribute__((weak)) get_user_pages_fast(unsigned long start, int nr_pages, int write, struct page **pages) { |