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  1. 11 Jun, 2018 6 commits
  3. 09 Jun, 2018 1 commit
    • Luc Van Oostenryck's avatar
      riscv: split the declaration of __copy_user · 86406d51
      Luc Van Oostenryck authored 
      We use a single __copy_user assembly function to copy memory both from
and to userspace. While this works, it triggers sparse errors because
we're implicitly casting between the kernel and user address spaces by
calling __copy_user.

This patch splits the C declaration into a pair of functions,
__asm_copy_{to,from}_user, that have sane semantics WRT __user. This
split make things fine from sparse's point of view. The assembly
implementation keeps a single definition but add a double ENTRY() for it,
one for __asm_copy_to_user and another one for __asm_copy_from_user.
The result is a spare-safe implementation that pays no performance
or code size penalty.
Signed-off-by: default avatarLuc Van Oostenryck <luc.vanoostenryck@gmail.com>
Signed-off-by: default avatarPalmer Dabbelt <palmer@sifive.com>
      86406d51
  5. 07 Jun, 2018 2 commits
  7. 04 Jun, 2018 6 commits
    • Palmer Dabbelt's avatar
      RISC-V: Preliminary Perf Support · 32c81bce
      Palmer Dabbelt authored 
      The RISC-V ISA defines a core set of performance counters that must
exist on all processors along with a standard way to add more
performance counters.

This patch set adds preliminary perf support for RISC-V systems.  Long
term we'll move to model where all PMUs can be built into the kernel at
the same time, detected at runtime (possibly via device tree), and
provided to userspace.  Since we currently only support the ISA-mandated
performance counters there's no need to detect anything right now.
Signed-off-by: default avatarPalmer Dabbelt <palmer@sifive.com>
      32c81bce
    • Alan Kao's avatar
      perf: riscv: Add Document for Future Porting Guide · 0d431558
      Alan Kao authored 
      Reviewed-by: default avatarAlex Solomatnikov <sols@sifive.com>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Greentime Hu <greentime@andestech.com>
Signed-off-by: default avatarAlan Kao <alankao@andestech.com>
Signed-off-by: default avatarPalmer Dabbelt <palmer@sifive.com>
      0d431558
    • Alan Kao's avatar
      perf: riscv: preliminary RISC-V support · 178e9fc4
      Alan Kao authored 
      This patch provide a basic PMU, riscv_base_pmu, which supports two
general hardware event, instructions and cycles.  Furthermore, this
PMU serves as a reference implementation to ease the portings in
the future.

riscv_base_pmu should be able to run on any RISC-V machine that
conforms to the Priv-Spec.  Note that the latest qemu model hasn't
fully support a proper behavior of Priv-Spec 1.10 yet, but work
around should be easy with very small fixes.  Please check
https://github.com/riscv/riscv-qemu/pull/115 for future updates.

Cc: Nick Hu <nickhu@andestech.com>
Cc: Greentime Hu <greentime@andestech.com>
Signed-off-by: default avatarAlan Kao <alankao@andestech.com>
Signed-off-by: default avatarPalmer Dabbelt <palmer@sifive.com>
      178e9fc4
    • Palmer Dabbelt's avatar
      MAINTAINERS: Update Albert's email, he's back at Berkeley · 9c521764
      Palmer Dabbelt authored 
      When I was adding a MAINTAINERS entry for SiFive's drivers I realized
that Albert's email is out of date -- he's gone back to Berkeley, so his
SiFive email is technically defunct.  This patch updates his entry to a
current email address, hosted at Berkeley.
Signed-off-by: default avatarPalmer Dabbelt <palmer@sifive.com>
      9c521764
    • Palmer Dabbelt's avatar
      MAINTAINERS: Add myself as a maintainer for SiFive's drivers · 3ed45d7f
      Palmer Dabbelt authored 
      There aren't actually any files in the tree that match these patterns
right now, but we've just started submitting our drivers so I thought it
would be good to make sure there's at least someone at SiFive who's
listed as maintaining them.  I'm leaving the RISC-V lists on here
because:

* As of today, all the RISC-V ASICs that people can actually buy are
  from SiFive -- though hopefully there'll be more soon!
* The RTL for many of our devices is open source, so I anticipate these
  devices might make they way chips from other vendors.
* We may standardize some of these devices as part of a RISC-V
  specification at some point in the future.

I'm a bit swamped right now so I might not be the most active maintainer
of these drivers, but I think it'd be good to make sure someone who has
hardware access gets CC'd on updates to our drivers just as a sanity
check.  Hopefully that's an OK way to handle this.
Signed-off-by: default avatarPalmer Dabbelt <palmer@sifive.com>
      3ed45d7f
    • Alan Kao's avatar
      riscv: Fix the bug in memory access fixup code · ebcbd75e
      Alan Kao authored 
      A piece of fixup code is currently shared by __copy_user and
__clear_user.  It first disables the access to user-space memory
and then returns the "n" argument, which represents #(bytes not processed).
However,__copy_user's "n" is in register a2, while __clear_user's in a1,
and thus it causes errors for programs like setdomainname02 testcase in LTP.

This patch fixes this issue by separating their fixup code and returning
the right value for the kernel to handle a relative fault properly.
Signed-off-by: default avatarAlan Kao <alankao@andestech.com>
Cc: Greentime Hu <greentime@andestech.com>
Cc: Zong Li <zong@andestech.com>
Cc: Vincent Chen <vincentc@andestech.com>
Signed-off-by: default avatarPalmer Dabbelt <palmer@sifive.com>
      ebcbd75e
  9. 03 Jun, 2018 6 commits
    • Linus Torvalds's avatar
      Linux 4.17 · 29dcea88
      Linus Torvalds authored
      29dcea88
    • Linus Torvalds's avatar
      Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · 325e14f9
      Linus Torvalds authored 
      Pull vfs fixes from Al Viro.

 - fix io_destroy()/aio_complete() race

 - the vfs_open() change to get rid of open_check_o_direct() boilerplate
   was nice, but buggy. Al has a patch avoiding a revert, but that's
   definitely not a last-day fodder, so for now revert it is...

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  Revert "fs: fold open_check_o_direct into do_dentry_open"
  fix io_destroy()/aio_complete() race
      325e14f9
    • Al Viro's avatar
      Revert "fs: fold open_check_o_direct into do_dentry_open" · af04fadc
      Al Viro authored 
      This reverts commit cab64df1.

Having vfs_open() in some cases drop the reference to
struct file combined with

	error = vfs_open(path, f, cred);
	if (error) {
		put_filp(f);
		return ERR_PTR(error);
	}
	return f;

is flat-out wrong.  It used to be

		error = vfs_open(path, f, cred);
		if (!error) {
			/* from now on we need fput() to dispose of f */
			error = open_check_o_direct(f);
			if (error) {
				fput(f);
				f = ERR_PTR(error);
			}
		} else {
			put_filp(f);
			f = ERR_PTR(error);
		}

and sure, having that open_check_o_direct() boilerplate gotten rid of is
nice, but not that way...

Worse, another call chain (via finish_open()) is FUBAR now wrt
FILE_OPENED handling - in that case we get error returned, with file
already hit by fput() *AND* FILE_OPENED not set.  Guess what happens in
path_openat(), when it hits

	if (!(opened & FILE_OPENED)) {
		BUG_ON(!error);
		put_filp(file);
	}

The root cause of all that crap is that the callers of do_dentry_open()
have no way to tell which way did it fail; while that could be fixed up
(by passing something like int *opened to do_dentry_open() and have it
marked if we'd called ->open()), it's probably much too late in the
cycle to do so right now.
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      af04fadc
    • Linus Torvalds's avatar
      Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 874cd339
      Linus Torvalds authored 
      Pull scheduler fixes from Thomas Gleixner:

 - two patches addressing the problem that the scheduler allows under
   certain conditions user space tasks to be scheduled on CPUs which are
   not yet fully booted which causes a few subtle and hard to debug
   issue

 - add a missing runqueue clock update in the deadline scheduler which
   triggers a warning under certain circumstances

 - fix a silly typo in the scheduler header file

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/headers: Fix typo
  sched/deadline: Fix missing clock update
  sched/core: Require cpu_active() in select_task_rq(), for user tasks
  sched/core: Fix rules for running on online && !active CPUs
      874cd339
    • Linus Torvalds's avatar
      Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 26bdace7
      Linus Torvalds authored 
      Pull perf tooling fixes from Thomas Gleixner:

 - fix 'perf test Session topology' segfault on s390 (Thomas Richter)

 - fix NULL return handling in bpf__prepare_load() (YueHaibing)

 - fix indexing on Coresight ETM packet queue decoder (Mathieu Poirier)

 - fix perf.data format description of NRCPUS header (Arnaldo Carvalho
   de Melo)

 - update perf.data documentation section on cpu topology

 - handle uncore event aliases in small groups properly (Kan Liang)

 - add missing perf_sample.addr into python sample dictionary (Leo Yan)

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf tools: Fix perf.data format description of NRCPUS header
  perf script python: Add addr into perf sample dict
  perf data: Update documentation section on cpu topology
  perf cs-etm: Fix indexing for decoder packet queue
  perf bpf: Fix NULL return handling in bpf__prepare_load()
  perf test: "Session topology" dumps core on s390
  perf parse-events: Handle uncore event aliases in small groups properly
      26bdace7
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 918fe1b3
      Linus Torvalds authored 
      Pull networking fixes from David Miller:

 1) Infinite loop in _decode_session6(), from Eric Dumazet.

 2) Pass correct argument to nla_strlcpy() in netfilter, also from Eric
    Dumazet.

 3) Out of bounds memory access in ipv6 srh code, from Mathieu Xhonneux.

 4) NULL deref in XDP_REDIRECT handling of tun driver, from Toshiaki
    Makita.

 5) Incorrect idr release in cls_flower, from Paul Blakey.

 6) Probe error handling fix in davinci_emac, from Dan Carpenter.

 7) Memory leak in XPS configuration, from Alexander Duyck.

 8) Use after free with cloned sockets in kcm, from Kirill Tkhai.

 9) MTU handling fixes fo ip_tunnel and ip6_tunnel, from Nicolas
    Dichtel.

10) Fix UAPI hole in bpf data structure for 32-bit compat applications,
    from Daniel Borkmann.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (33 commits)
  bpf: fix uapi hole for 32 bit compat applications
  net: usb: cdc_mbim: add flag FLAG_SEND_ZLP
  ip6_tunnel: remove magic mtu value 0xFFF8
  ip_tunnel: restore binding to ifaces with a large mtu
  net: dsa: b53: Add BCM5389 support
  kcm: Fix use-after-free caused by clonned sockets
  net-sysfs: Fix memory leak in XPS configuration
  ixgbe: fix parsing of TC actions for HW offload
  net: ethernet: davinci_emac: fix error handling in probe()
  net/ncsi: Fix array size in dumpit handler
  cls_flower: Fix incorrect idr release when failing to modify rule
  net/sonic: Use dma_mapping_error()
  xfrm Fix potential error pointer dereference in xfrm_bundle_create.
  vhost_net: flush batched heads before trying to busy polling
  tun: Fix NULL pointer dereference in XDP redirect
  be2net: Fix error detection logic for BE3
  net: qmi_wwan: Add Netgear Aircard 779S
  mlxsw: spectrum: Forbid creation of VLAN 1 over port/LAG
  atm: zatm: fix memcmp casting
  iwlwifi: pcie: compare with number of IRQs requested for, not number of CPUs
  ...
      918fe1b3
  11. 02 Jun, 2018 15 commits
  13. 01 Jun, 2018 4 commits
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