1. 04 May, 2018 1 commit
  2. 26 Apr, 2018 1 commit
    • Thomas Gleixner's avatar
      Revert: Unify CLOCK_MONOTONIC and CLOCK_BOOTTIME · a3ed0e43
      Thomas Gleixner authored
      Revert commits
      
      92af4dcb ("tracing: Unify the "boot" and "mono" tracing clocks")
      127bfa5f ("hrtimer: Unify MONOTONIC and BOOTTIME clock behavior")
      7250a404 ("posix-timers: Unify MONOTONIC and BOOTTIME clock behavior")
      d6c7270e ("timekeeping: Remove boot time specific code")
      f2d6fdbf ("Input: Evdev - unify MONOTONIC and BOOTTIME clock behavior")
      d6ed449a ("timekeeping: Make the MONOTONIC clock behave like the BOOTTIME clock")
      72199320 ("timekeeping: Add the new CLOCK_MONOTONIC_ACTIVE clock")
      
      As stated in the pull request for the unification of CLOCK_MONOTONIC and
      CLOCK_BOOTTIME, it was clear that we might have to revert the change.
      
      As reported by several folks systemd and other applications rely on the
      documented behaviour of CLOCK_MONOTONIC on Linux and break with the above
      changes. After resume daemons time out and other timeout related issues are
      observed. Rafael compiled this list:
      
      * systemd kills daemons on resume, after >WatchdogSec seconds
        of suspending (Genki Sky).  [Verified that that's because systemd uses
        CLOCK_MONOTONIC and expects it to not include the suspend time.]
      
      * systemd-journald misbehaves after resume:
        systemd-journald[7266]: File /var/log/journal/016627c3c4784cd4812d4b7e96a34226/system.journal
      corrupted or uncleanly shut down, renaming and replacing.
        (Mike Galbraith).
      
      * NetworkManager reports "networking disabled" and networking is broken
        after resume 50% of the time (Pavel).  [May be because of systemd.]
      
      * MATE desktop dims the display and starts the screensaver right after
        system resume (Pavel).
      
      * Full system hang during resume (me).  [May be due to systemd or NM or both.]
      
      That happens on debian and open suse systems.
      
      It's sad, that these problems were neither catched in -next nor by those
      folks who expressed interest in this change.
      Reported-by: default avatarRafael J. Wysocki <rjw@rjwysocki.net>
      Reported-by: Genki Sky <sky@genki.is>,
      Reported-by: Pavel Machek's avatarPavel Machek <pavel@ucw.cz>
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
      Cc: John Stultz <john.stultz@linaro.org>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Kevin Easton <kevin@guarana.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Mark Salyzyn <salyzyn@android.com>
      Cc: Michael Kerrisk <mtk.manpages@gmail.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Petr Mladek <pmladek@suse.com>
      Cc: Prarit Bhargava <prarit@redhat.com>
      Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      a3ed0e43
  3. 25 Apr, 2018 1 commit
  4. 23 Apr, 2018 4 commits
  5. 22 Apr, 2018 1 commit
  6. 20 Apr, 2018 2 commits
  7. 19 Apr, 2018 1 commit
  8. 18 Apr, 2018 5 commits
  9. 17 Apr, 2018 2 commits
    • Petr Mladek's avatar
      livepatch: Allow to call a custom callback when freeing shadow variables · 3b2c77d0
      Petr Mladek authored
      We might need to do some actions before the shadow variable is freed.
      For example, we might need to remove it from a list or free some data
      that it points to.
      
      This is already possible now. The user can get the shadow variable
      by klp_shadow_get(), do the necessary actions, and then call
      klp_shadow_free().
      
      This patch allows to do it a more elegant way. The user could implement
      the needed actions in a callback that is passed to klp_shadow_free()
      as a parameter. The callback usually does reverse operations to
      the constructor callback that can be called by klp_shadow_*alloc().
      
      It is especially useful for klp_shadow_free_all(). There we need to do
      these extra actions for each found shadow variable with the given ID.
      
      Note that the memory used by the shadow variable itself is still released
      later by rcu callback. It is needed to protect internal structures that
      keep all shadow variables. But the destructor is called immediately.
      The shadow variable must not be access anyway after klp_shadow_free()
      is called. The user is responsible to protect this any suitable way.
      
      Be aware that the destructor is called under klp_shadow_lock. It is
      the same as for the contructor in klp_shadow_alloc().
      Signed-off-by: default avatarPetr Mladek <pmladek@suse.com>
      Acked-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
      Acked-by: default avatarMiroslav Benes <mbenes@suse.cz>
      Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
      3b2c77d0
    • Petr Mladek's avatar
      livepatch: Initialize shadow variables safely by a custom callback · e91c2518
      Petr Mladek authored
      The existing API allows to pass a sample data to initialize the shadow
      data. It works well when the data are position independent. But it fails
      miserably when we need to set a pointer to the shadow structure itself.
      
      Unfortunately, we might need to initialize the pointer surprisingly
      often because of struct list_head. It is even worse because the list
      might be hidden in other common structures, for example, struct mutex,
      struct wait_queue_head.
      
      For example, this was needed to fix races in ALSA sequencer. It required
      to add mutex into struct snd_seq_client. See commit b3defb79
      ("ALSA: seq: Make ioctls race-free") and commit d15d662e
      ("ALSA: seq: Fix racy pool initializations")
      
      This patch makes the API more safe. A custom constructor function and data
      are passed to klp_shadow_*alloc() functions instead of the sample data.
      
      Note that ctor_data are no longer a template for shadow->data. It might
      point to any data that might be necessary when the constructor is called.
      
      Also note that the constructor is called under klp_shadow_lock. It is
      an internal spin_lock that synchronizes alloc() vs. get() operations,
      see klp_shadow_get_or_alloc(). On one hand, this adds a risk of ABBA
      deadlocks. On the other hand, it allows to do some operations safely.
      For example, we could add the new structure into an existing list.
      This must be done only once when the structure is allocated.
      Reported-by: default avatarNicolai Stange <nstange@suse.de>
      Signed-off-by: default avatarPetr Mladek <pmladek@suse.com>
      Acked-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
      Acked-by: default avatarMiroslav Benes <mbenes@suse.cz>
      Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
      e91c2518
  10. 16 Apr, 2018 3 commits
  11. 12 Apr, 2018 2 commits
  12. 11 Apr, 2018 7 commits
  13. 10 Apr, 2018 1 commit
  14. 09 Apr, 2018 3 commits
    • David Howells's avatar
      afs: Implement @sys substitution handling · 6f8880d8
      David Howells authored
      Implement the AFS feature by which @sys at the end of a pathname component
      may be substituted for one of a list of values, typically naming the
      operating system.  Up to 16 alternatives may be specified and these are
      tried in turn until one works.  Each network namespace has[*] a separate
      independent list.
      
      Upon creation of a new network namespace, the list of values is
      initialised[*] to a single OpenAFS-compatible string representing arch type
      plus "_linux26".  For example, on x86_64, the sysname is "amd64_linux26".
      
      [*] Or will, once network namespace support is finalised in kAFS.
      
      The list may be set by:
      
      	# for i in foo bar linux-x86_64; do echo $i; done >/proc/fs/afs/sysname
      
      for which separate writes to the same fd are amalgamated and applied on
      close.  The LF character may be used as a separator to specify multiple
      items in the same write() call.
      
      The list may be cleared by:
      
      	# echo >/proc/fs/afs/sysname
      
      and read by:
      
      	# cat /proc/fs/afs/sysname
      	foo
      	bar
      	linux-x86_64
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      6f8880d8
    • Dominik Brodowski's avatar
      syscalls/core, syscalls/x86: Clean up compat syscall stub naming convention · 5ac9efa3
      Dominik Brodowski authored
      Tidy the naming convention for compat syscall subs. Hints which describe
      the purpose of the stub go in front and receive a double underscore to
      denote that they are generated on-the-fly by the COMPAT_SYSCALL_DEFINEx()
      macro.
      
      For the generic case, this means:
      
      t            kernel_waitid	# common C function (see kernel/exit.c)
      
          __do_compat_sys_waitid	# inlined helper doing the actual work
      				# (takes original parameters as declared)
      
      T   __se_compat_sys_waitid	# sign-extending C function calling inlined
      				# helper (takes parameters of type long,
      				# casts them to unsigned long and then to
      				# the declared type)
      
      T        compat_sys_waitid      # alias to __se_compat_sys_waitid()
      				# (taking parameters as declared), to
      				# be included in syscall table
      
      For x86, the naming is as follows:
      
      t            kernel_waitid	# common C function (see kernel/exit.c)
      
          __do_compat_sys_waitid	# inlined helper doing the actual work
      				# (takes original parameters as declared)
      
      t   __se_compat_sys_waitid      # sign-extending C function calling inlined
      				# helper (takes parameters of type long,
      				# casts them to unsigned long and then to
      				# the declared type)
      
      T __ia32_compat_sys_waitid	# IA32_EMULATION 32-bit-ptregs -> C stub,
      				# calls __se_compat_sys_waitid(); to be
      				# included in syscall table
      
      T  __x32_compat_sys_waitid	# x32 64-bit-ptregs -> C stub, calls
      				# __se_compat_sys_waitid(); to be included
      				# in syscall table
      
      If only one of IA32_EMULATION and x32 is enabled, __se_compat_sys_waitid()
      may be inlined into the stub __{ia32,x32}_compat_sys_waitid().
      Suggested-by: default avatarIngo Molnar <mingo@kernel.org>
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/20180409105145.5364-3-linux@dominikbrodowski.netSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      5ac9efa3
    • Prakash, Prashanth's avatar
      cpuidle: Add definition of residency to sysfs documentation · 792ccb45
      Prakash, Prashanth authored
      Add definition of minimum residency to sysfs documentation and
      update the tree to include the residency sysfs entry.
      Signed-off-by: default avatarPrashanth Prakash <pprakash@codeaurora.org>
      Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      792ccb45
  15. 08 Apr, 2018 1 commit
    • Esben Haabendal's avatar
      net/fsl_pq_mdio: Allow explicit speficition of TBIPA address · 21481189
      Esben Haabendal authored
      This introduces a simpler and generic method for for finding (and mapping)
      the TBIPA register.
      
      Instead of relying of complicated logic for finding the TBIPA register
      address based on the MDIO or MII register block base
      address, which even in some cases relies on undocumented shadow registers,
      a second "reg" entry for the mdio bus devicetree node specifies the TBIPA
      register.
      
      Backwards compatibility is kept, as the existing logic is applied when
      only a single "reg" mapping is specified.
      Signed-off-by: default avatarEsben Haabendal <eha@deif.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      21481189
  16. 07 Apr, 2018 1 commit
  17. 06 Apr, 2018 4 commits