search for: folio_put

..._resp = alloc_skb_frag(sizeof(*keep_resp), + GFP_KERNEL); + if (!keep_resp) { + ret = -ENOMEM; + goto out; + } + memset(keep_resp, 0, sizeof(*keep_resp)); + keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC); + o2net_sendpage(sc, keep_resp, sizeof(*keep_resp)); + folio_put(virt_to_folio(keep_resp)); goto out; case O2NET_MSG_KEEP_RESP_MAGIC: goto out; @@ -1439,15 +1448,22 @@ static void o2net_rx_until_empty(struct work_struct *work) sc_put(sc); } -static void o2net_initialize_handshake(void) +static struct o2net_handshake *o2net_initialize_handshake(vo...

...page_frag_alloc(NULL, sizeof(*keep_resp), + GFP_KERNEL); + if (!keep_resp) { + ret = -ENOMEM; + goto out; + } + memset(keep_resp, 0, sizeof(*keep_resp)); + keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC); + o2net_sendpage(sc, keep_resp, sizeof(*keep_resp)); + folio_put(virt_to_folio(keep_resp)); goto out; case O2NET_MSG_KEEP_RESP_MAGIC: goto out; @@ -1439,15 +1448,22 @@ static void o2net_rx_until_empty(struct work_struct *work) sc_put(sc); } -static void o2net_initialize_handshake(void) +static struct o2net_handshake *o2net_initialize_handshake(vo...

...= alloc_skb_frag(sizeof(*keep_resp), + GFP_KERNEL); + if (!keep_resp) { + ret = -ENOMEM; + goto out; + } + memset(keep_resp, 0, sizeof(*keep_resp)); + keep_resp->magic = + cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC); + o2net_sendpage(sc, keep_resp, sizeof(*keep_resp)); + folio_put(virt_to_folio(keep_resp)); goto out; case O2NET_MSG_KEEP_RESP_MAGIC: goto out; @@ -1439,15 +1449,23 @@ static void o2net_rx_until_empty(struct work_struct *work) sc_put(sc); } -static void o2net_initialize_handshake(void) +static struct o2net_handshake *o2net_initialize_handshake(vo...

...page_frag_alloc(NULL, sizeof(*keep_resp), + GFP_KERNEL); + if (!keep_resp) { + ret = -ENOMEM; + goto out; + } + memset(keep_resp, 0, sizeof(*keep_resp)); + keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC); + o2net_sendpage(sc, keep_resp, sizeof(*keep_resp)); + folio_put(virt_to_folio(keep_resp)); goto out; case O2NET_MSG_KEEP_RESP_MAGIC: goto out; @@ -1439,15 +1448,22 @@ static void o2net_rx_until_empty(struct work_struct *work) sc_put(sc); } -static void o2net_initialize_handshake(void) +static struct o2net_handshake *o2net_initialize_handshake(vo...

...t. If the folio is free the entry must + * have been removed already. If it happens to have already + * been re-allocated after being freed all we do is lock and + * unlock it. + */ + if (!folio_try_get(folio)) + return 0; + + if (!folio_lock_or_retry(folio, vma->vm_mm, vmf->flags)) { + folio_put(folio); return VM_FAULT_RETRY; + } mmu_notifier_range_init_owner(&range, MMU_NOTIFY_EXCLUSIVE, 0, vma->vm_mm, vmf->address & PAGE_MASK, (vmf->address & PAGE_MASK) + PAGE_SIZE, NULL); @@ -3577,6 +3590,7 @@ static vm_fault_t remove_device_exclusive_entry(struct vm_...

...pages don't have individual refcounts; all the refcounts are actually taken on the folio. So this should be: if (!folio_try_get(folio)) return 0; (you can fix up the comment yourself) > + if (!folio_lock_or_retry(folio, vma->vm_mm, vmf->flags)) { > + put_page(vmf->page); folio_put(folio); > return VM_FAULT_RETRY; > + } > mmu_notifier_range_init_owner(&range, MMU_NOTIFY_EXCLUSIVE, 0, vma, > vma->vm_mm, vmf->address & PAGE_MASK, > (vmf->address & PAGE_MASK) + PAGE_SIZE, NULL); > @@ -3637,6 +3648,7 @@ static vm_fault_t remo...

Hi all, this series removes most users of the write_one_page API. These helpers internally call ->writepage which we are gradually removing from the kernel. Changes since v3: - drop all patches merged in v6.3-rc1 - re-add the jfs patch Changes since v2: - more minix error handling fixes Changes since v1: - drop the btrfs changes (queue up in the btrfs tree) - drop the finaly move to

Device exclusive page table entries are used to prevent CPU access to a page whilst it is being accessed from a device. Typically this is used to implement atomic operations when the underlying bus does not support atomic access. When a CPU thread encounters a device exclusive entry it locks the page and restores the original entry after calling mmu notifiers to signal drivers that exclusive

On 12.11.24 14:53, Jason Gunthorpe wrote: > On Tue, Nov 12, 2024 at 10:10:06AM +0100, David Hildenbrand wrote: >> On 12.11.24 06:26, Matthew Wilcox wrote: >>> On Mon, Nov 11, 2024 at 08:26:54AM +0000, Fuad Tabba wrote: >>>> Thanks for your comments Jason, and for clarifying my cover letter >>>> David. I think David has covered everything, and I'll make

*** BLURB HERE *** Bean Huo (5): fs/buffer: clean up block_commit_write fs/buffer.c: convert block_commit_write to return void ext4: No need to check return value of block_commit_write() fs/ocfs2: No need to check return value of block_commit_write() udf: No need to check return value of block_commit_write() fs/buffer.c | 24 +++++++-----------------

...is and operates on the memdesc's refcount ... if it has one. I don't know if it'll be exported to modules; I can see uses in the mm code, but I'm not sure if modules will have a need. Each memdesc type will have its own function to call to free the memdesc. So we'll still have folio_put(). But slab does not have, need nor want a refcount, so it'll just slab_free(). I expect us to keep around a list of recently-freed memdescs of a particular type with their pages still attached so that we can allocate them again quickly (or reclaim them under memory pressure). Once that free...