Merge tag 'asm-generic-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd...

Pull asm-generic updates from Arnd Bergmann:
 "These are cleanups for architecture specific header files:

   - the comments in include/linux/syscalls.h have gone out of sync and
     are really pointless, so these get removed

   - The asm/bitsperlong.h header no longer needs to be architecture
     specific on modern compilers, so use a generic version for newer
     architectures that use new enough userspace compilers

   - A cleanup for virt_to_pfn/virt_to_bus to have proper type checking,
     forcing the use of pointers"

* tag 'asm-generic-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic:
  syscalls: Remove file path comments from headers
  tools arch: Remove uapi bitsperlong.h of hexagon and microblaze
  asm-generic: Unify uapi bitsperlong.h for arm64, riscv and loongarch
  m68k/mm: Make pfn accessors static inlines
  arm64: memory: Make virt_to_pfn() a static inline
  ARM: mm: Make virt_to_pfn() a static inline
  asm-generic/page.h: Make pfn accessors static inlines
  xen/netback: Pass (void *) to virt_to_page()
  netfs: Pass a pointer to virt_to_page()
  cifs: Pass a pointer to virt_to_page() in cifsglob
  cifs: Pass a pointer to virt_to_page()
  riscv: mm: init: Pass a pointer to virt_to_page()
  ARC: init: Pass a pointer to virt_to_pfn() in init
  m68k: Pass a pointer to virt_to_pfn() virt_to_page()
  fs/proc/kcore.c: Pass a pointer to virt_addr_valid()

diff --cc arch/arm/include/asm/page.h
Simple merge

diff --cc arch/arm/kernel/entry-armv.S
Simple merge

diff --cc arch/arm/mach-pxa/gumstix.c
Simple merge

diff --cc arch/arm/mach-sa1100/pm.c
Simple merge

diff --cc arch/arm/mm/dma-mapping.c
Simple merge

diff --cc arch/arm/mm/mmu.c
Simple merge

diff --cc arch/arm64/include/asm/memory.h
Simple merge

diff --cc arch/m68k/mm/mcfmmu.c
Simple merge

diff --cc arch/riscv/mm/init.c
Simple merge

diff --cc drivers/net/xen-netback/netback.c
Simple merge

diff --cc fs/proc/kcore.c
Simple merge

diff --cc fs/smb/client/cifsglob.h
Simple merge

diff --cc fs/smb/client/smbdirect.c
Simple merge

diff --cc include/linux/syscalls.h
Simple merge

diff --cc include/uapi/asm-generic/unistd.h
Simple merge

diff --cc kernel/sys_ni.c
Simple merge

diff --cc lib/scatterlist.c
index e97d7060329e8a7abdcad16a87a5cb3cf0d1af61,8d7519a8f308d94b5d4ac92e4a61fcbc6e6dd670..e86231a44c3de53e62d82977186e0b509ebf428b
--- 1/lib/scatterlist.c
--- 2/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@@ -1097,270 -1095,3 +1097,270 @@@ size_t sg_zero_buffer(struct scatterlis
        return offset;
  }
  EXPORT_SYMBOL(sg_zero_buffer);
-                               page = virt_to_page(kaddr);
 +
 +/*
 + * Extract and pin a list of up to sg_max pages from UBUF- or IOVEC-class
 + * iterators, and add them to the scatterlist.
 + */
 +static ssize_t extract_user_to_sg(struct iov_iter *iter,
 +                                ssize_t maxsize,
 +                                struct sg_table *sgtable,
 +                                unsigned int sg_max,
 +                                iov_iter_extraction_t extraction_flags)
 +{
 +      struct scatterlist *sg = sgtable->sgl + sgtable->nents;
 +      struct page **pages;
 +      unsigned int npages;
 +      ssize_t ret = 0, res;
 +      size_t len, off;
 +
 +      /* We decant the page list into the tail of the scatterlist */
 +      pages = (void *)sgtable->sgl +
 +              array_size(sg_max, sizeof(struct scatterlist));
 +      pages -= sg_max;
 +
 +      do {
 +              res = iov_iter_extract_pages(iter, &pages, maxsize, sg_max,
 +                                           extraction_flags, &off);
 +              if (res < 0)
 +                      goto failed;
 +
 +              len = res;
 +              maxsize -= len;
 +              ret += len;
 +              npages = DIV_ROUND_UP(off + len, PAGE_SIZE);
 +              sg_max -= npages;
 +
 +              for (; npages > 0; npages--) {
 +                      struct page *page = *pages;
 +                      size_t seg = min_t(size_t, PAGE_SIZE - off, len);
 +
 +                      *pages++ = NULL;
 +                      sg_set_page(sg, page, seg, off);
 +                      sgtable->nents++;
 +                      sg++;
 +                      len -= seg;
 +                      off = 0;
 +              }
 +      } while (maxsize > 0 && sg_max > 0);
 +
 +      return ret;
 +
 +failed:
 +      while (sgtable->nents > sgtable->orig_nents)
 +              put_page(sg_page(&sgtable->sgl[--sgtable->nents]));
 +      return res;
 +}
 +
 +/*
 + * Extract up to sg_max pages from a BVEC-type iterator and add them to the
 + * scatterlist.  The pages are not pinned.
 + */
 +static ssize_t extract_bvec_to_sg(struct iov_iter *iter,
 +                                ssize_t maxsize,
 +                                struct sg_table *sgtable,
 +                                unsigned int sg_max,
 +                                iov_iter_extraction_t extraction_flags)
 +{
 +      const struct bio_vec *bv = iter->bvec;
 +      struct scatterlist *sg = sgtable->sgl + sgtable->nents;
 +      unsigned long start = iter->iov_offset;
 +      unsigned int i;
 +      ssize_t ret = 0;
 +
 +      for (i = 0; i < iter->nr_segs; i++) {
 +              size_t off, len;
 +
 +              len = bv[i].bv_len;
 +              if (start >= len) {
 +                      start -= len;
 +                      continue;
 +              }
 +
 +              len = min_t(size_t, maxsize, len - start);
 +              off = bv[i].bv_offset + start;
 +
 +              sg_set_page(sg, bv[i].bv_page, len, off);
 +              sgtable->nents++;
 +              sg++;
 +              sg_max--;
 +
 +              ret += len;
 +              maxsize -= len;
 +              if (maxsize <= 0 || sg_max == 0)
 +                      break;
 +              start = 0;
 +      }
 +
 +      if (ret > 0)
 +              iov_iter_advance(iter, ret);
 +      return ret;
 +}
 +
 +/*
 + * Extract up to sg_max pages from a KVEC-type iterator and add them to the
 + * scatterlist.  This can deal with vmalloc'd buffers as well as kmalloc'd or
 + * static buffers.  The pages are not pinned.
 + */
 +static ssize_t extract_kvec_to_sg(struct iov_iter *iter,
 +                                ssize_t maxsize,
 +                                struct sg_table *sgtable,
 +                                unsigned int sg_max,
 +                                iov_iter_extraction_t extraction_flags)
 +{
 +      const struct kvec *kv = iter->kvec;
 +      struct scatterlist *sg = sgtable->sgl + sgtable->nents;
 +      unsigned long start = iter->iov_offset;
 +      unsigned int i;
 +      ssize_t ret = 0;
 +
 +      for (i = 0; i < iter->nr_segs; i++) {
 +              struct page *page;
 +              unsigned long kaddr;
 +              size_t off, len, seg;
 +
 +              len = kv[i].iov_len;
 +              if (start >= len) {
 +                      start -= len;
 +                      continue;
 +              }
 +
 +              kaddr = (unsigned long)kv[i].iov_base + start;
 +              off = kaddr & ~PAGE_MASK;
 +              len = min_t(size_t, maxsize, len - start);
 +              kaddr &= PAGE_MASK;
 +
 +              maxsize -= len;
 +              ret += len;
 +              do {
 +                      seg = min_t(size_t, len, PAGE_SIZE - off);
 +                      if (is_vmalloc_or_module_addr((void *)kaddr))
 +                              page = vmalloc_to_page((void *)kaddr);
 +                      else
++                              page = virt_to_page((void *)kaddr);
 +
 +                      sg_set_page(sg, page, len, off);
 +                      sgtable->nents++;
 +                      sg++;
 +                      sg_max--;
 +
 +                      len -= seg;
 +                      kaddr += PAGE_SIZE;
 +                      off = 0;
 +              } while (len > 0 && sg_max > 0);
 +
 +              if (maxsize <= 0 || sg_max == 0)
 +                      break;
 +              start = 0;
 +      }
 +
 +      if (ret > 0)
 +              iov_iter_advance(iter, ret);
 +      return ret;
 +}
 +
 +/*
 + * Extract up to sg_max folios from an XARRAY-type iterator and add them to
 + * the scatterlist.  The pages are not pinned.
 + */
 +static ssize_t extract_xarray_to_sg(struct iov_iter *iter,
 +                                  ssize_t maxsize,
 +                                  struct sg_table *sgtable,
 +                                  unsigned int sg_max,
 +                                  iov_iter_extraction_t extraction_flags)
 +{
 +      struct scatterlist *sg = sgtable->sgl + sgtable->nents;
 +      struct xarray *xa = iter->xarray;
 +      struct folio *folio;
 +      loff_t start = iter->xarray_start + iter->iov_offset;
 +      pgoff_t index = start / PAGE_SIZE;
 +      ssize_t ret = 0;
 +      size_t offset, len;
 +      XA_STATE(xas, xa, index);
 +
 +      rcu_read_lock();
 +
 +      xas_for_each(&xas, folio, ULONG_MAX) {
 +              if (xas_retry(&xas, folio))
 +                      continue;
 +              if (WARN_ON(xa_is_value(folio)))
 +                      break;
 +              if (WARN_ON(folio_test_hugetlb(folio)))
 +                      break;
 +
 +              offset = offset_in_folio(folio, start);
 +              len = min_t(size_t, maxsize, folio_size(folio) - offset);
 +
 +              sg_set_page(sg, folio_page(folio, 0), len, offset);
 +              sgtable->nents++;
 +              sg++;
 +              sg_max--;
 +
 +              maxsize -= len;
 +              ret += len;
 +              if (maxsize <= 0 || sg_max == 0)
 +                      break;
 +      }
 +
 +      rcu_read_unlock();
 +      if (ret > 0)
 +              iov_iter_advance(iter, ret);
 +      return ret;
 +}
 +
 +/**
 + * extract_iter_to_sg - Extract pages from an iterator and add to an sglist
 + * @iter: The iterator to extract from
 + * @maxsize: The amount of iterator to copy
 + * @sgtable: The scatterlist table to fill in
 + * @sg_max: Maximum number of elements in @sgtable that may be filled
 + * @extraction_flags: Flags to qualify the request
 + *
 + * Extract the page fragments from the given amount of the source iterator and
 + * add them to a scatterlist that refers to all of those bits, to a maximum
 + * addition of @sg_max elements.
 + *
 + * The pages referred to by UBUF- and IOVEC-type iterators are extracted and
 + * pinned; BVEC-, KVEC- and XARRAY-type are extracted but aren't pinned; PIPE-
 + * and DISCARD-type are not supported.
 + *
 + * No end mark is placed on the scatterlist; that's left to the caller.
 + *
 + * @extraction_flags can have ITER_ALLOW_P2PDMA set to request peer-to-peer DMA
 + * be allowed on the pages extracted.
 + *
 + * If successful, @sgtable->nents is updated to include the number of elements
 + * added and the number of bytes added is returned.  @sgtable->orig_nents is
 + * left unaltered.
 + *
 + * The iov_iter_extract_mode() function should be used to query how cleanup
 + * should be performed.
 + */
 +ssize_t extract_iter_to_sg(struct iov_iter *iter, size_t maxsize,
 +                         struct sg_table *sgtable, unsigned int sg_max,
 +                         iov_iter_extraction_t extraction_flags)
 +{
 +      if (maxsize == 0)
 +              return 0;
 +
 +      switch (iov_iter_type(iter)) {
 +      case ITER_UBUF:
 +      case ITER_IOVEC:
 +              return extract_user_to_sg(iter, maxsize, sgtable, sg_max,
 +                                        extraction_flags);
 +      case ITER_BVEC:
 +              return extract_bvec_to_sg(iter, maxsize, sgtable, sg_max,
 +                                        extraction_flags);
 +      case ITER_KVEC:
 +              return extract_kvec_to_sg(iter, maxsize, sgtable, sg_max,
 +                                        extraction_flags);
 +      case ITER_XARRAY:
 +              return extract_xarray_to_sg(iter, maxsize, sgtable, sg_max,
 +                                          extraction_flags);
 +      default:
 +              pr_err("%s(%u) unsupported\n", __func__, iov_iter_type(iter));
 +              WARN_ON_ONCE(1);
 +              return -EIO;
 +      }
 +}
 +EXPORT_SYMBOL_GPL(extract_iter_to_sg);