1. 20 Aug, 2020 4 commits
  2. 19 Aug, 2020 2 commits
    • Arvind Sankar's avatar
      lib/string.c: Use freestanding environment · 33d0f96f
      Arvind Sankar authored
      
      
      gcc can transform the loop in a naive implementation of memset/memcpy
      etc into a call to the function itself.  This optimization is enabled by
      -ftree-loop-distribute-patterns.
      
      This has been the case for a while, but gcc-10.x enables this option at
      -O2 rather than -O3 as in previous versions.
      
      Add -ffreestanding, which implicitly disables this optimization with
      gcc.  It is unclear whether clang performs such optimizations, but
      hopefully it will also not do so in a freestanding environment.
      
      Signed-off-by: default avatarArvind Sankar <nivedita@alum.mit.edu>
      Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56888
      
      
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      33d0f96f
    • Arvind Sankar's avatar
      x86/boot/compressed: Use builtin mem functions for decompressor · 394b19d6
      Arvind Sankar authored
      Since commits
      
        c041b5ad ("x86, boot: Create a separate string.h file to provide standard string functions")
        fb4cac57
      
       ("x86, boot: Move memcmp() into string.h and string.c")
      
      the decompressor stub has been using the compiler's builtin memcpy,
      memset and memcmp functions, _except_ where it would likely have the
      largest impact, in the decompression code itself.
      
      Remove the #undef's of memcpy and memset in misc.c so that the
      decompressor code also uses the compiler builtins.
      
      The rationale given in the comment doesn't really apply: just because
      some functions use the out-of-line version is no reason to not use the
      builtin version in the rest.
      
      Replace the comment with an explanation of why memzero and memmove are
      being #define'd.
      
      Drop the suggestion to #undef in boot/string.h as well: the out-of-line
      versions are not really optimized versions, they're generic code that's
      good enough for the preboot environment. The compiler will likely
      generate better code for constant-size memcpy/memset/memcmp if it is
      allowed to.
      
      Most decompressors' performance is unchanged, with the exception of LZ4
      and 64-bit ZSTD.
      
      	Before	After ARCH
      LZ4	  73ms	 10ms   32
      LZ4	 120ms	 10ms	64
      ZSTD	  90ms	 74ms	64
      
      Measurements on QEMU on 2.2GHz Broadwell Xeon, using defconfig kernels.
      
      Decompressor code size has small differences, with the largest being
      that 64-bit ZSTD decreases just over 2k. The largest code size increase
      was on 64-bit XZ, of about 400 bytes.
      
      Signed-off-by: default avatarArvind Sankar <nivedita@alum.mit.edu>
      Suggested-by: default avatarNick Terrell <nickrterrell@gmail.com>
      Tested-by: default avatarNick Terrell <nickrterrell@gmail.com>
      Acked-by: default avatarKees Cook <keescook@chromium.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      394b19d6
  3. 18 Aug, 2020 5 commits
    • Linus Torvalds's avatar
      Merge tag 'spi-fix-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi · 18445bf4
      Linus Torvalds authored
      Pull spi fixes from Mark Brown:
       "A bunch of fixes that came in for SPI during the merge window.
      
        Some from ST and others for their controller, one from Lukas for a
        race between device addition and controller unregistration and one
        from fix from Geert for the DT bindings which unbreaks validation"
      
      * tag 'spi-fix-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
        dt-bindings: lpspi: Add missing boolean type for fsl,spi-only-use-cs1-sel
        spi: stm32: always perform registers configuration prior to transfer
        spi: stm32: fixes suspend/resume management
        spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate
        spi: stm32: fix fifo threshold level in case of short transfer
        spi: stm32h7: fix race condition at end of transfer
        spi: stm32: clear only asserted irq flags on interrupt
        spi: Prevent adding devices below an unregistering controller
      18445bf4
    • Linus Torvalds's avatar
      Merge tag 'fixes-2020-08-18' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock · 9899b587
      Linus Torvalds authored
      Pull ia64 page table fix from Mike Rapoport:
       "Fix regression in IA-64 caused by page table allocation refactoring
      
        The refactoring and consolidation of <asm/pgalloc.h> caused regression
        on parisc and ia64. The fix for parisc made it into v5.9-rc1 while the
        fix ia64 got delayed a bit and here it is"
      
      * tag 'fixes-2020-08-18' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock:
        arch/ia64: Restore arch-specific pgd_offset_k implementation
      9899b587
    • Yang Shi's avatar
      mm/memory.c: skip spurious TLB flush for retried page fault · b7333b58
      Yang Shi authored
      Recently we found regression when running will_it_scale/page_fault3 test
      on ARM64.  Over 70% down for the multi processes cases and over 20% down
      for the multi threads cases.  It turns out the regression is caused by
      commit 89b15332
      
       ("mm: drop mmap_sem before calling
      balance_dirty_pages() in write fault").
      
      The test mmaps a memory size file then write to the mapping, this would
      make all memory dirty and trigger dirty pages throttle, that upstream
      commit would release mmap_sem then retry the page fault.  The retried
      page fault would see correct PTEs installed then just fall through to
      spurious TLB flush.  The regression is caused by the excessive spurious
      TLB flush.  It is fine on x86 since x86's spurious TLB flush is no-op.
      
      We could just skip the spurious TLB flush to mitigate the regression.
      
      Suggested-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Reported-by: default avatarXu Yu <xuyu@linux.alibaba.com>
      Debugged-by: default avatarXu Yu <xuyu@linux.alibaba.com>
      Tested-by: default avatarXu Yu <xuyu@linux.alibaba.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarYang Shi <shy828301@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b7333b58
    • Linus Torvalds's avatar
      Merge tag 'pstore-v5.9-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux · 06a4ec1d
      Linus Torvalds authored
      Pull mailmap update from Kees Cook:
       "This was originally part of my pstore tree, but when I realized that
        mailmap needed re-alphabetizing, I decided to wait until -rc1 to send
        this, as I saw a lot of mailmap additions pending in -next for the
        merge window.
      
        It's a programmatic reordering and the addition of a pstore
        contributor's preferred email address"
      
      * tag 'pstore-v5.9-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
        mailmap: Add WeiXiong Liao
        mailmap: Restore dictionary sorting
      06a4ec1d
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net · 4cf75621
      Linus Torvalds authored
      Pull networking fixes from David Miller:
       "Another batch of fixes:
      
        1) Remove nft_compat counter flush optimization, it generates warnings
           from the refcount infrastructure. From Florian Westphal.
      
        2) Fix BPF to search for build id more robustly, from Jiri Olsa.
      
        3) Handle bogus getopt lengths in ebtables, from Florian Westphal.
      
        4) Infoleak and other fixes to j1939 CAN driver, from Eric Dumazet and
           Oleksij Rempel.
      
        5) Reset iter properly on mptcp sendmsg() error, from Florian
           Westphal.
      
        6) Show a saner speed in bonding broadcast mode, from Jarod Wilson.
      
        7) Various kerneldoc fixes in bonding and elsewhere, from Lee Jones.
      
        8) Fix double unregister in bonding during namespace tear down, from
           Cong Wang.
      
        9) Disable RP filter during icmp_redirect selftest, from David Ahern"
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (75 commits)
        otx2_common: Use devm_kcalloc() in otx2_config_npa()
        net: qrtr: fix usage of idr in port assignment to socket
        selftests: disable rp_filter for icmp_redirect.sh
        Revert "net: xdp: pull ethernet header off packet after computing skb->protocol"
        phylink: <linux/phylink.h>: fix function prototype kernel-doc warning
        mptcp: sendmsg: reset iter on error redux
        net: devlink: Remove overzealous WARN_ON with snapshots
        tipc: not enable tipc when ipv6 works as a module
        tipc: fix uninit skb->data in tipc_nl_compat_dumpit()
        net: Fix potential wrong skb->protocol in skb_vlan_untag()
        net: xdp: pull ethernet header off packet after computing skb->protocol
        ipvlan: fix device features
        bonding: fix a potential double-unregister
        can: j1939: add rxtimer for multipacket broadcast session
        can: j1939: abort multipacket broadcast session when timeout occurs
        can: j1939: cancel rxtimer on multipacket broadcast session complete
        can: j1939: fix support for multipacket broadcast message
        net: fddi: skfp: cfm: Remove seemingly unused variable 'ID_sccs'
        net: fddi: skfp: cfm: Remove set but unused variable 'oldstate'
        net: fddi: skfp: smt: Remove seemingly unused variable 'ID_sccs'
        ...
      4cf75621
  4. 17 Aug, 2020 16 commits
  5. 16 Aug, 2020 12 commits
    • David S. Miller's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf · 8c26544f
      David S. Miller authored
      
      
      Pablo Neira Ayuso says:
      
      ====================
      Netfilter fixes for net
      
      The following patchset contains Netfilter fixes for net:
      
      1) Endianness issue in IPv4 option support in nft_exthdr,
         from Stephen Suryaputra.
      
      2) Removes the waitcount optimization in nft_compat,
         from Florian Westphal.
      
      3) Remove ipv6 -> nf_defrag_ipv6 module dependency, from
         Florian Westphal.
      
      4) Memleak in chain binding support, also from Florian.
      
      5) Simplify nft_flowtable.sh selftest, from Fabian Frederick.
      
      6) Optional MTU arguments for selftest nft_flowtable.sh,
         also from Fabian.
      
      7) Remove noise error report when killing process in
         selftest nft_flowtable.sh, from Fabian Frederick.
      
      8) Reject bogus getsockopt option length in ebtables,
         from Florian Westphal.
      ====================
      
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8c26544f
    • David S. Miller's avatar
      Merge tag 'linux-can-fixes-for-5.9-20200815' of... · 71a50419
      David S. Miller authored
      Merge tag 'linux-can-fixes-for-5.9-20200815' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can
      
      
      
      Marc Kleine-Budde says:
      
      ====================
      pull-request: can 2020-08-15
      
      this is a pull request of 4 patches for net/master.
      
      All patches are by Zhang Changzhong and fix broadcast related problems in the
      j1939 CAN networking stack.
      ====================
      
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      71a50419
    • Miaohe Lin's avatar
      net: Fix potential wrong skb->protocol in skb_vlan_untag() · 55eff0eb
      Miaohe Lin authored
      We may access the two bytes after vlan_hdr in vlan_set_encap_proto(). So
      we should pull VLAN_HLEN + sizeof(unsigned short) in skb_vlan_untag() or
      we may access the wrong data.
      
      Fixes: 0d5501c1
      
       ("net: Always untag vlan-tagged traffic on input.")
      Signed-off-by: default avatarMiaohe Lin <linmiaohe@huawei.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      55eff0eb
    • Jason A. Donenfeld's avatar
      net: xdp: pull ethernet header off packet after computing skb->protocol · f8414a8d
      Jason A. Donenfeld authored
      When an XDP program changes the ethernet header protocol field,
      eth_type_trans is used to recalculate skb->protocol. In order for
      eth_type_trans to work correctly, the ethernet header must actually be
      part of the skb data segment, so the code first pushes that onto the
      head of the skb. However, it subsequently forgets to pull it back off,
      making the behavior of the passed-on packet inconsistent between the
      protocol modifying case and the static protocol case. This patch fixes
      the issue by simply pulling the ethernet header back off of the skb
      head.
      
      Fixes: 29724956
      
       ("net: fix generic XDP to handle if eth header was mangled")
      Cc: Jesper Dangaard Brouer <brouer@redhat.com>
      Cc: David S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarJason A. Donenfeld <Jason@zx2c4.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f8414a8d
    • Mahesh Bandewar's avatar
      ipvlan: fix device features · d0f5c707
      Mahesh Bandewar authored
      Processing NETDEV_FEAT_CHANGE causes IPvlan links to lose
      NETIF_F_LLTX feature because of the incorrect handling of
      features in ipvlan_fix_features().
      
      --before--
      lpaa10:~# ethtool -k ipvl0 | grep tx-lockless
      tx-lockless: on [fixed]
      lpaa10:~# ethtool -K ipvl0 tso off
      Cannot change tcp-segmentation-offload
      Actual changes:
      vlan-challenged: off [fixed]
      tx-lockless: off [fixed]
      lpaa10:~# ethtool -k ipvl0 | grep tx-lockless
      tx-lockless: off [fixed]
      lpaa10:~#
      
      --after--
      lpaa10:~# ethtool -k ipvl0 | grep tx-lockless
      tx-lockless: on [fixed]
      lpaa10:~# ethtool -K ipvl0 tso off
      Cannot change tcp-segmentation-offload
      Could not change any device features
      lpaa10:~# ethtool -k ipvl0 | grep tx-lockless
      tx-lockless: on [fixed]
      lpaa10:~#
      
      Fixes: 2ad7bf36
      
       ("ipvlan: Initial check-in of the IPVLAN driver.")
      Signed-off-by: default avatarMahesh Bandewar <maheshb@google.com>
      Cc: Eric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d0f5c707
    • Cong Wang's avatar
      bonding: fix a potential double-unregister · 83270702
      Cong Wang authored
      When we tear down a network namespace, we unregister all
      the netdevices within it. So we may queue a slave device
      and a bonding device together in the same unregister queue.
      
      If the only slave device is non-ethernet, it would
      automatically unregister the bonding device as well. Thus,
      we may end up unregistering the bonding device twice.
      
      Workaround this special case by checking reg_state.
      
      Fixes: 9b5e383c
      
       ("net: Introduce unregister_netdevice_many()")
      Reported-by: default avatar <syzbot+af23e7f3e0a7e10c8b67@syzkaller.appspotmail.com>
      Cc: Eric Dumazet <eric.dumazet@gmail.com>
      Cc: Andy Gospodarek <andy@greyhouse.net>
      Cc: Jay Vosburgh <j.vosburgh@gmail.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      83270702
    • Linus Torvalds's avatar
      Linux 5.9-rc1 · 9123e3a7
      Linus Torvalds authored
      9123e3a7
    • Linus Torvalds's avatar
      Merge tag 'io_uring-5.9-2020-08-15' of git://git.kernel.dk/linux-block · 2cc3c4b3
      Linus Torvalds authored
      Pull io_uring fixes from Jens Axboe:
       "A few differerent things in here.
      
        Seems like syzbot got some more io_uring bits wired up, and we got a
        handful of reports and the associated fixes are in here.
      
        General fixes too, and a lot of them marked for stable.
      
        Lastly, a bit of fallout from the async buffered reads, where we now
        more easily trigger short reads. Some applications don't really like
        that, so the io_read() code now handles short reads internally, and
        got a cleanup along the way so that it's now easier to read (and
        documented). We're now passing tests that failed before"
      
      * tag 'io_uring-5.9-2020-08-15' of git://git.kernel.dk/linux-block:
        io_uring: short circuit -EAGAIN for blocking read attempt
        io_uring: sanitize double poll handling
        io_uring: internally retry short reads
        io_uring: retain iov_iter state over io_read/io_write calls
        task_work: only grab task signal lock when needed
        io_uring: enable lookup of links holding inflight files
        io_uring: fail poll arm on queue proc failure
        io_uring: hold 'ctx' reference around task_work queue + execute
        fs: RWF_NOWAIT should imply IOCB_NOIO
        io_uring: defer file table grabbing request cleanup for locked requests
        io_uring: add missing REQ_F_COMP_LOCKED for nested requests
        io_uring: fix recursive completion locking on oveflow flush
        io_uring: use TWA_SIGNAL for task_work uncondtionally
        io_uring: account locked memory before potential error case
        io_uring: set ctx sq/cq entry count earlier
        io_uring: Fix NULL pointer dereference in loop_rw_iter()
        io_uring: add comments on how the async buffered read retry works
        io_uring: io_async_buf_func() need not test page bit
      2cc3c4b3
    • Mike Rapoport's avatar
      parisc: fix PMD pages allocation by restoring pmd_alloc_one() · 6f6aea7e
      Mike Rapoport authored
      Commit 1355c31e ("asm-generic: pgalloc: provide generic pmd_alloc_one()
      and pmd_free_one()") converted parisc to use generic version of
      pmd_alloc_one() but it missed the fact that parisc uses order-1 pages for
      PMD.
      
      Restore the original version of pmd_alloc_one() for parisc, just use
      GFP_PGTABLE_KERNEL that implies __GFP_ZERO instead of GFP_KERNEL and
      memset.
      
      Fixes: 1355c31e
      
       ("asm-generic: pgalloc: provide generic pmd_alloc_one() and pmd_free_one()")
      Reported-by: default avatarMeelis Roos <mroos@linux.ee>
      Signed-off-by: default avatarMike Rapoport <rppt@linux.ibm.com>
      Tested-by: default avatarMeelis Roos <mroos@linux.ee>
      Reviewed-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
      Link: https://lkml.kernel.org/r/9f2b5ebd-e4a4-0fa1-6cd3-4b9f6892d1ad@linux.ee
      
      
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      6f6aea7e
    • Linus Torvalds's avatar
      Merge tag 'block-5.9-2020-08-14' of git://git.kernel.dk/linux-block · 4b6c093e
      Linus Torvalds authored
      Pull block fixes from Jens Axboe:
       "A few fixes on the block side of things:
      
         - Discard granularity fix (Coly)
      
         - rnbd cleanups (Guoqing)
      
         - md error handling fix (Dan)
      
         - md sysfs fix (Junxiao)
      
         - Fix flush request accounting, which caused an IO slowdown for some
           configurations (Ming)
      
         - Properly propagate loop flag for partition scanning (Lennart)"
      
      * tag 'block-5.9-2020-08-14' of git://git.kernel.dk/linux-block:
        block: fix double account of flush request's driver tag
        loop: unset GENHD_FL_NO_PART_SCAN on LOOP_CONFIGURE
        rnbd: no need to set bi_end_io in rnbd_bio_map_kern
        rnbd: remove rnbd_dev_submit_io
        md-cluster: Fix potential error pointer dereference in resize_bitmaps()
        block: check queue's limits.discard_granularity in __blkdev_issue_discard()
        md: get sysfs entry after redundancy attr group create
      4b6c093e
    • Linus Torvalds's avatar
      Merge tag 'riscv-for-linus-5.9-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux · d84835b1
      Linus Torvalds authored
      Pull RISC-V fix from Palmer Dabbelt:
       "I collected a single fix during the merge window: we managed to break
        the early trap setup on !MMU, this fixes it"
      
      * tag 'riscv-for-linus-5.9-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
        riscv: Setup exception vector for nommu platform
      d84835b1
    • Linus Torvalds's avatar
      Merge tag 'sh-for-5.9' of git://git.libc.org/linux-sh · 5bbec3cf
      Linus Torvalds authored
      Pull arch/sh updates from Rich Felker:
       "Cleanup, SECCOMP_FILTER support, message printing fixes, and other
        changes to arch/sh"
      
      * tag 'sh-for-5.9' of git://git.libc.org/linux-sh: (34 commits)
        sh: landisk: Add missing initialization of sh_io_port_base
        sh: bring syscall_set_return_value in line with other architectures
        sh: Add SECCOMP_FILTER
        sh: Rearrange blocks in entry-common.S
        sh: switch to copy_thread_tls()
        sh: use the generic dma coherent remap allocator
        sh: don't allow non-coherent DMA for NOMMU
        dma-mapping: consolidate the NO_DMA definition in kernel/dma/Kconfig
        sh: unexport register_trapped_io and match_trapped_io_handler
        sh: don't include <asm/io_trapped.h> in <asm/io.h>
        sh: move the ioremap implementation out of line
        sh: move ioremap_fixed details out of <asm/io.h>
        sh: remove __KERNEL__ ifdefs from non-UAPI headers
        sh: sort the selects for SUPERH alphabetically
        sh: remove -Werror from Makefiles
        sh: Replace HTTP links with HTTPS ones
        arch/sh/configs: remove obsolete CONFIG_SOC_CAMERA*
        sh: stacktrace: Remove stacktrace_ops.stack()
        sh: machvec: Modernize printing of kernel messages
        sh: pci: Modernize printing of kernel messages
        ...
      5bbec3cf
  6. 15 Aug, 2020 1 commit
    • Jens Axboe's avatar
      io_uring: short circuit -EAGAIN for blocking read attempt · f91daf56
      Jens Axboe authored
      One case was missed in the short IO retry handling, and that's hitting
      -EAGAIN on a blocking attempt read (eg from io-wq context). This is a
      problem on sockets that are marked as non-blocking when created, they
      don't carry any REQ_F_NOWAIT information to help us terminate them
      instead of perpetually retrying.
      
      Fixes: 227c0c96
      
       ("io_uring: internally retry short reads")
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      f91daf56