Eric Lee / smarc-fsl-linux-kernel

18 Jan, 2012

3 commits

  • f429ee3b8   Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit ... Browse Code »

    * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit: (29 commits)
    audit: no leading space in audit_log_d_path prefix
    audit: treat s_id as an untrusted string
    audit: fix signedness bug in audit_log_execve_info()
    audit: comparison on interprocess fields
    audit: implement all object interfield comparisons
    audit: allow interfield comparison between gid and ogid
    audit: complex interfield comparison helper
    audit: allow interfield comparison in audit rules
    Kernel: Audit Support For The ARM Platform
    audit: do not call audit_getname on error
    audit: only allow tasks to set their loginuid if it is -1
    audit: remove task argument to audit_set_loginuid
    audit: allow audit matching on inode gid
    audit: allow matching on obj_uid
    audit: remove audit_finish_fork as it can't be called
    audit: reject entry,always rules
    audit: inline audit_free to simplify the look of generic code
    audit: drop audit_set_macxattr as it doesn't do anything
    audit: inline checks for not needing to collect aux records
    audit: drop some potentially inadvisable likely notations
    ...

    Use evil merge to fix up grammar mistakes in Kconfig file.

    Bad speling and horrible grammar (and copious swearing) is to be
    expected, but let's keep it to commit messages and comments, rather than
    expose it to users in config help texts or printouts.

    Linus Torvalds
     
  • b05d8447e   audit: inline audit_syscall_entry to reduce burden on archs ... Browse Code »
    44

    Every arch calls:

    if (unlikely(current->audit_context))
    audit_syscall_entry()

    which requires knowledge about audit (the existance of audit_context) in
    the arch code. Just do it all in static inline in audit.h so that arch's
    can remain blissfully ignorant.

    Signed-off-by: Eric Paris

    Eric Paris
     
  • d7e7528bc   Audit: push audit success and retcode into arch ptrace.h ... Browse Code »
    132

    The audit system previously expected arches calling to audit_syscall_exit to
    supply as arguments if the syscall was a success and what the return code was.
    Audit also provides a helper AUDITSC_RESULT which was supposed to simplify things
    by converting from negative retcodes to an audit internal magic value stating
    success or failure. This helper was wrong and could indicate that a valid
    pointer returned to userspace was a failed syscall. The fix is to fix the
    layering foolishness. We now pass audit_syscall_exit a struct pt_reg and it
    in turns calls back into arch code to collect the return value and to
    determine if the syscall was a success or failure. We also define a generic
    is_syscall_success() macro which determines success/failure based on if the
    value is < -MAX_ERRNO. This works for arches like x86 which do not use a
    separate mechanism to indicate syscall failure.

    We make both the is_syscall_success() and regs_return_value() static inlines
    instead of macros. The reason is because the audit function must take a void*
    for the regs. (uml calls theirs struct uml_pt_regs instead of just struct
    pt_regs so audit_syscall_exit can't take a struct pt_regs). Since the audit
    function takes a void* we need to use static inlines to cast it back to the
    arch correct structure to dereference it.

    The other major change is that on some arches, like ia64, MIPS and ppc, we
    change regs_return_value() to give us the negative value on syscall failure.
    THE only other user of this macro, kretprobe_example.c, won't notice and it
    makes the value signed consistently for the audit functions across all archs.

    In arch/sh/kernel/ptrace_64.c I see that we were using regs[9] in the old
    audit code as the return value. But the ptrace_64.h code defined the macro
    regs_return_value() as regs[3]. I have no idea which one is correct, but this
    patch now uses the regs_return_value() function, so it now uses regs[3].

    For powerpc we previously used regs->result but now use the
    regs_return_value() function which uses regs->gprs[3]. regs->gprs[3] is
    always positive so the regs_return_value(), much like ia64 makes it negative
    before calling the audit code when appropriate.

    Signed-off-by: Eric Paris
    Acked-by: H. Peter Anvin [for x86 portion]
    Acked-by: Tony Luck [for ia64]
    Acked-by: Richard Weinberger [for uml]
    Acked-by: David S. Miller [for sparc]
    Acked-by: Ralf Baechle [for mips]
    Acked-by: Benjamin Herrenschmidt [for ppc]

    Eric Paris
     

17 Jan, 2012

1 commit

  • 5674124f9   Merge branch 'x86-syscall-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip ... Browse Code »

    * 'x86-syscall-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
    x86: Move from trace_syscalls.c to asm/syscall.h
    x86, um: Fix typo in 32-bit system call modifications
    um: Use $(srctree) not $(KBUILD_SRC)
    x86, um: Mark system call tables readonly
    x86, um: Use the same style generated syscall tables as native
    um: Generate headers before generating user-offsets.s
    um: Run host archheaders, allow use of host generated headers
    kbuild, headers.sh: Don't make archheaders explicitly
    x86, syscall: Allow syscall offset to be symbolic
    x86, syscall: Re-fix typo in comment
    x86: Simplify syscallhdr.sh
    x86: Generate system call tables and unistd_*.h from tables
    checksyscalls: Use arch/x86/syscalls/syscall_32.tbl as source
    x86: Machine-readable syscall tables and scripts to process them
    trace: Include in trace_syscalls.c
    x86-64, ia32: Move compat_ni_syscall into C and its own file
    x86-64, syscall: Adjust comment spacing and remove typo
    kbuild: Add support for an "archheaders" target
    kbuild: Add support for installing generated asm headers

    Linus Torvalds
     

12 Jan, 2012

1 commit

  • 9f13a1fd4   cpu: Register a generic CPU device on architectures that currently do not ... Browse Code »
    44

    frv, h8300, m68k, microblaze, openrisc, score, um and xtensa currently
    do not register a CPU device. Add the config option GENERIC_CPU_DEVICES
    which causes a generic CPU device to be registered for each present CPU,
    and make all these architectures select it.

    Richard Weinberger covered UML and suggested using
    per_cpu.

    Signed-off-by: Ben Hutchings
    Signed-off-by: Linus Torvalds

    Ben Hutchings
     

09 Jan, 2012

1 commit

  • eb59c505f   Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm ... Browse Code »

    * 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (76 commits)
    PM / Hibernate: Implement compat_ioctl for /dev/snapshot
    PM / Freezer: fix return value of freezable_schedule_timeout_killable()
    PM / shmobile: Allow the A4R domain to be turned off at run time
    PM / input / touchscreen: Make st1232 use device PM QoS constraints
    PM / QoS: Introduce dev_pm_qos_add_ancestor_request()
    PM / shmobile: Remove the stay_on flag from SH7372's PM domains
    PM / shmobile: Don't include SH7372's INTCS in syscore suspend/resume
    PM / shmobile: Add support for the sh7372 A4S power domain / sleep mode
    PM: Drop generic_subsys_pm_ops
    PM / Sleep: Remove forward-only callbacks from AMBA bus type
    PM / Sleep: Remove forward-only callbacks from platform bus type
    PM: Run the driver callback directly if the subsystem one is not there
    PM / Sleep: Make pm_op() and pm_noirq_op() return callback pointers
    PM/Devfreq: Add Exynos4-bus device DVFS driver for Exynos4210/4212/4412.
    PM / Sleep: Merge internal functions in generic_ops.c
    PM / Sleep: Simplify generic system suspend callbacks
    PM / Hibernate: Remove deprecated hibernation snapshot ioctls
    PM / Sleep: Fix freezer failures due to racy usermodehelper_is_disabled()
    ARM: S3C64XX: Implement basic power domain support
    PM / shmobile: Use common always on power domain governor
    ...

    Fix up trivial conflict in fs/xfs/xfs_buf.c due to removal of unused
    XBT_FORCE_SLEEP bit

    Linus Torvalds
     

07 Jan, 2012

1 commit

  • 376613e81   Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip ... Browse Code »

    * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
    x86, tsc: Skip TSC synchronization checks for tsc=reliable
    clocksource: Convert tcb_clksrc to use clocksource_register_hz/khz
    clocksource: cris: Convert to clocksource_register_khz
    clocksource: xtensa: Convert to clocksource_register_hz/khz
    clocksource: um: Convert to clocksource_register_hz/khz
    clocksource: parisc: Convert to clocksource_register_hz/khz
    clocksource: m86k: Convert to clocksource_register_hz/khz
    time: x86: Replace LATCH with PIT_LATCH in i8253 clocksource driver
    time: x86: Remove CLOCK_TICK_RATE from acpi_pm clocksource driver
    time: x86: Remove CLOCK_TICK_RATE from mach_timer.h
    time: x86: Remove CLOCK_TICK_RATE from tsc code
    time: Fix spelling mistakes in new comments
    time: fix bogus comment in timekeeping_get_ns_raw

    Linus Torvalds
     

12 Dec, 2011

3 commits

  • 1268fbc74   nohz: Remove tick_nohz_idle_enter_norcu() / tick_nohz_idle_exit_norcu() ... Browse Code »

    Those two APIs were provided to optimize the calls of
    tick_nohz_idle_enter() and rcu_idle_enter() into a single
    irq disabled section. This way no interrupt happening in-between would
    needlessly process any RCU job.

    Now we are talking about an optimization for which benefits
    have yet to be measured. Let's start simple and completely decouple
    idle rcu and dyntick idle logics to simplify.

    Signed-off-by: Frederic Weisbecker
    Cc: Ingo Molnar
    Cc: Thomas Gleixner
    Cc: Peter Zijlstra
    Reviewed-by: Josh Triplett
    Signed-off-by: Paul E. McKenney

    Frederic Weisbecker
     
  • 2bbb6817c   nohz: Allow rcu extended quiescent state handling seperately from tick stop ... Browse Code »

    It is assumed that rcu won't be used once we switch to tickless
    mode and until we restart the tick. However this is not always
    true, as in x86-64 where we dereference the idle notifiers after
    the tick is stopped.

    To prepare for fixing this, add two new APIs:
    tick_nohz_idle_enter_norcu() and tick_nohz_idle_exit_norcu().

    If no use of RCU is made in the idle loop between
    tick_nohz_enter_idle() and tick_nohz_exit_idle() calls, the arch
    must instead call the new *_norcu() version such that the arch doesn't
    need to call rcu_idle_enter() and rcu_idle_exit().

    Otherwise the arch must call tick_nohz_enter_idle() and
    tick_nohz_exit_idle() and also call explicitly:

    - rcu_idle_enter() after its last use of RCU before the CPU is put
    to sleep.
    - rcu_idle_exit() before the first use of RCU after the CPU is woken
    up.

    Signed-off-by: Frederic Weisbecker
    Cc: Mike Frysinger
    Cc: Guan Xuetao
    Cc: David Miller
    Cc: Chris Metcalf
    Cc: Hans-Christian Egtvedt
    Cc: Ralf Baechle
    Cc: Paul E. McKenney
    Cc: Ingo Molnar
    Cc: Peter Zijlstra
    Cc: Thomas Gleixner
    Cc: H. Peter Anvin
    Cc: Russell King
    Cc: Paul Mackerras
    Cc: Heiko Carstens
    Cc: Paul Mundt
    Signed-off-by: Paul E. McKenney

    Frederic Weisbecker
     
  • 280f06774   nohz: Separate out irq exit and idle loop dyntick logic ... Browse Code »

    The tick_nohz_stop_sched_tick() function, which tries to delay
    the next timer tick as long as possible, can be called from two
    places:

    - From the idle loop to start the dytick idle mode
    - From interrupt exit if we have interrupted the dyntick
    idle mode, so that we reprogram the next tick event in
    case the irq changed some internal state that requires this
    action.

    There are only few minor differences between both that
    are handled by that function, driven by the ts->inidle
    cpu variable and the inidle parameter. The whole guarantees
    that we only update the dyntick mode on irq exit if we actually
    interrupted the dyntick idle mode, and that we enter in RCU extended
    quiescent state from idle loop entry only.

    Split this function into:

    - tick_nohz_idle_enter(), which sets ts->inidle to 1, enters
    dynticks idle mode unconditionally if it can, and enters into RCU
    extended quiescent state.

    - tick_nohz_irq_exit() which only updates the dynticks idle mode
    when ts->inidle is set (ie: if tick_nohz_idle_enter() has been called).

    To maintain symmetry, tick_nohz_restart_sched_tick() has been renamed
    into tick_nohz_idle_exit().

    This simplifies the code and micro-optimize the irq exit path (no need
    for local_irq_save there). This also prepares for the split between
    dynticks and rcu extended quiescent state logics. We'll need this split to
    further fix illegal uses of RCU in extended quiescent states in the idle
    loop.

    Signed-off-by: Frederic Weisbecker
    Cc: Mike Frysinger
    Cc: Guan Xuetao
    Cc: David Miller
    Cc: Chris Metcalf
    Cc: Hans-Christian Egtvedt
    Cc: Ralf Baechle
    Cc: Paul E. McKenney
    Cc: Ingo Molnar
    Cc: Peter Zijlstra
    Cc: Thomas Gleixner
    Cc: H. Peter Anvin
    Cc: Russell King
    Cc: Paul Mackerras
    Cc: Heiko Carstens
    Cc: Paul Mundt
    Signed-off-by: Paul E. McKenney
    Reviewed-by: Josh Triplett

    Frederic Weisbecker
     

10 Dec, 2011

1 commit

06 Dec, 2011

3 commits

22 Nov, 2011

2 commits

03 Nov, 2011

1 commit

  • de0a5345a   Merge branch 'for-linus' of git://github.com/richardweinberger/linux ... Browse Code »

    * 'for-linus' of git://github.com/richardweinberger/linux: (90 commits)
    um: fix ubd cow size
    um: Fix kmalloc argument order in um/vdso/vma.c
    um: switch to use of drivers/Kconfig
    UserModeLinux-HOWTO.txt: fix a typo
    UserModeLinux-HOWTO.txt: remove ^H characters
    um: we need sys/user.h only on i386
    um: merge delay_{32,64}.c
    um: distribute exports to where exported stuff is defined
    um: kill system-um.h
    um: generic ftrace.h will do...
    um: segment.h is x86-only and needed only there
    um: asm/pda.h is not needed anymore
    um: hw_irq.h can go generic as well
    um: switch to generic-y
    um: clean Kconfig up a bit
    um: a couple of missing dependencies...
    um: kill useless argument of free_chan() and free_one_chan()
    um: unify ptrace_user.h
    um: unify KSTK_...
    um: fix gcov build breakage
    ...

    Linus Torvalds
     

02 Nov, 2011

23 commits