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...

One fix and a minor cleanup. Only compile-tested due to lack of HW, so I'd be happy if someone with access to HW could test. But not sure how easy this is to trigger. Likely some concurrent MADV_DONTNEED on the PTE we just converted might be able to trigger it. Cc: Karol Herbst <kherbst at redhat.com> Cc: Lyude Paul <lyude at redhat.com> Cc: Danilo Krummrich <dakr at

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...