#include #include #include #include #include #include static void ceph_pagelist_unmap_tail(struct ceph_pagelist *pl) { if (pl->mapped_tail) { struct page *page = list_entry(pl->head.prev, struct page, lru); kunmap(page); pl->mapped_tail = NULL; } } void ceph_pagelist_release(struct ceph_pagelist *pl) { if (!atomic_dec_and_test(&pl->refcnt)) return; ceph_pagelist_unmap_tail(pl); while (!list_empty(&pl->head)) { struct page *page = list_first_entry(&pl->head, struct page, lru); list_del(&page->lru); __free_page(page); } ceph_pagelist_free_reserve(pl); kfree(pl); } EXPORT_SYMBOL(ceph_pagelist_release); static int ceph_pagelist_addpage(struct ceph_pagelist *pl) { struct page *page; if (!pl->num_pages_free) { page = __page_cache_alloc(GFP_NOFS); } else { page = list_first_entry(&pl->free_list, struct page, lru); list_del(&page->lru); --pl->num_pages_free; } if (!page) return -ENOMEM; pl->room += PAGE_SIZE; ceph_pagelist_unmap_tail(pl); list_add_tail(&page->lru, &pl->head); pl->mapped_tail = kmap(page); return 0; } int ceph_pagelist_append(struct ceph_pagelist *pl, const void *buf, size_t len) { while (pl->room < len) { size_t bit = pl->room; int ret; memcpy(pl->mapped_tail + (pl->length & ~PAGE_MASK), buf, bit); pl->length += bit; pl->room -= bit; buf += bit; len -= bit; ret = ceph_pagelist_addpage(pl); if (ret) return ret; } memcpy(pl->mapped_tail + (pl->length & ~PAGE_MASK), buf, len); pl->length += len; pl->room -= len; return 0; } EXPORT_SYMBOL(ceph_pagelist_append); /* Allocate enough pages for a pagelist to append the given amount * of data without without allocating. * Returns: 0 on success, -ENOMEM on error. */ int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space) { if (space <= pl->room) return 0; space -= pl->room; space = (space + PAGE_SIZE - 1) >> PAGE_SHIFT; /* conv to num pages */ while (space > pl->num_pages_free) { struct page *page = __page_cache_alloc(GFP_NOFS); if (!page) return -ENOMEM; list_add_tail(&page->lru, &pl->free_list); ++pl->num_pages_free; } return 0; } EXPORT_SYMBOL(ceph_pagelist_reserve); /* Free any pages that have been preallocated. */ int ceph_pagelist_free_reserve(struct ceph_pagelist *pl) { while (!list_empty(&pl->free_list)) { struct page *page = list_first_entry(&pl->free_list, struct page, lru); list_del(&page->lru); __free_page(page); --pl->num_pages_free; } BUG_ON(pl->num_pages_free); return 0; } EXPORT_SYMBOL(ceph_pagelist_free_reserve); /* Create a truncation point. */ void ceph_pagelist_set_cursor(struct ceph_pagelist *pl, struct ceph_pagelist_cursor *c) { c->pl = pl; c->page_lru = pl->head.prev; c->room = pl->room; } EXPORT_SYMBOL(ceph_pagelist_set_cursor); /* Truncate a pagelist to the given point. Move extra pages to reserve. * This won't sleep. * Returns: 0 on success, * -EINVAL if the pagelist doesn't match the trunc point pagelist */ int ceph_pagelist_truncate(struct ceph_pagelist *pl, struct ceph_pagelist_cursor *c) { struct page *page; if (pl != c->pl) return -EINVAL; ceph_pagelist_unmap_tail(pl); while (pl->head.prev != c->page_lru) { page = list_entry(pl->head.prev, struct page, lru); /* move from pagelist to reserve */ list_move_tail(&page->lru, &pl->free_list); ++pl->num_pages_free; } pl->room = c->room; if (!list_empty(&pl->head)) { page = list_entry(pl->head.prev, struct page, lru); pl->mapped_tail = kmap(page); } return 0; } EXPORT_SYMBOL(ceph_pagelist_truncate); ion>space:mode:
authorAleksander Morgado <aleksander@aleksander.es>2017-01-18 21:31:31 +0100
committerJohan Hovold <johan@kernel.org>2017-01-19 09:08:37 +0100
commit24d615a694d649aa2e167c3f97f62bdad07e3f84 (patch)
tree2fe33c115bdec6bf4b01e27afd90bb16fa668e22 /net/switchdev/Makefile
parent49def1853334396f948dcb4cedb9347abb318df5 (diff)
USB: serial: qcserial: add Dell DW5570 QDL
The Dell DW5570 is a re-branded Sierra Wireless MC8805 which will by default boot with vid 0x413c and pid 0x81a3. When triggered QDL download mode, the device switches to pid 0x81a6 and provides the standard TTY used for firmware upgrade. Cc: <stable@vger.kernel.org> Signed-off-by: Aleksander Morgado <aleksander@aleksander.es> Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'net/switchdev/Makefile')