Eric Lee / smarc-fsl-linux-kernel

01 Nov, 2011

2 commits

27 Jul, 2011

1 commit

  • 6fd4ce886   Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus ... Browse Code »

    * 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus: (31 commits)
    MIPS: Close races in TLB modify handlers.
    MIPS: Add uasm UASM_i_SRL_SAFE macro.
    MIPS: RB532: Use hex_to_bin()
    MIPS: Enable cpu_has_clo_clz for MIPS Technologies' platforms
    MIPS: PowerTV: Provide cpu-feature-overrides.h
    MIPS: Remove pointless return statement from empty void functions.
    MIPS: Limit fixrange_init() to the FIXMAP region
    MIPS: Install handlers for software IRQs
    MIPS: Move FIXADDR_TOP into spaces.h
    MIPS: Add SYNC after cacheflush
    MIPS: pfn_valid() is broken on low memory HIGHMEM systems
    MIPS: HIGHMEM DMA on noncoherent MIPS32 processors
    MIPS: topdown mmap support
    MIPS: Remove redundant addr_limit assignment on exec.
    MIPS: AR7: Replace __attribute__((__packed__)) with __packed
    MIPS: AR7: Remove 'space before tabs' in platform.c
    MIPS: Lantiq: Add missing clk_enable and clk_disable functions.
    MIPS: AR7: Fix trailing semicolon bug in clock.c
    MAINTAINERS: Update MIPS entry.
    MIPS: BCM63xx: Remove duplicate PERF_IRQSTAT_REG definition
    ...

    Linus Torvalds
     

26 Jul, 2011

1 commit

  • 3a7136602   MIPS: Remove redundant addr_limit assignment on exec. ... Browse Code »

    The address limit is already set in flush_old_exec() via set_fs(USER_DS)
    so this assignment is redundant.

    [ralf@linux-mips.org: also see dac853ae89043f1b7752875300faf614de43c74b for
    further explanation.]

    Signed-off-by: Mathias Krause
    Cc: Andrew Morton
    Cc: Linus Torvalds
    Cc: linux-mips@linux-mips.org
    Cc: linux-kernel@vger.kernel.org
    Patchwork: https://patchwork.linux-mips.org/patch/2466/
    Signed-off-by: Ralf Baechle

    Mathias Krause
     

15 Jun, 2011

1 commit

  • 94ea09c6a   MIPS: Add new unwind_stack variant ... Browse Code »

    The unwind_stack_by_address variant supports unwinding based
    on any kernel code address.
    This symbol is also exported so it can be called from modules.

    Signed-off-by: Daniel Kalmar
    Signed-off-by: Gergely Kis
    Signed-off-by: Robert Richter

    Daniel Kalmar
     

31 Mar, 2011

1 commit

17 Dec, 2010

1 commit

  • a989ff898   MIPS: Don't stomp on caller's ->regs[2] in copy_thread() ... Browse Code »

    We never needed that (->regs[2] is overwritten on return from syscall paths
    with return value of syscall, so storing it there early made no sense) and
    with new restart logics since d27240bf7e61d2656de18e158ec910a902030847 it
    has become really bad - we lose the original syscall number before the
    place where we decide that we might need a syscall restart.

    Note that for child we do need the assignment to regs[2] - it won't go
    through the normal return from syscall path.

    [Ralf: Issue found and reported by Lluís; initial investigations by me;
    bug finally found and patch by Al; testing by me and Lluís.]

    Signed-off-by: Al Viro
    Tested-by: Lluís Batlle i Rossell
    Signed-off-by: Ralf Baechle

    Al Viro
     

13 Apr, 2010

1 commit

  • 7a7ac952d   MIPS: Trace: Don't trace irqsoff for the idle process ... Browse Code »

    Like x86 did in arch/x86/kernel/{process_32.c,process_64.c}, also don't
    trace irqsoff for idle.

    If there's no useful work to be done, we don't care about the irqsoff
    duration. If we trace the idle process, the max duration of irqsoff will
    be the idle time and make the irqsoff tracer useless.

    Signed-off-by: Wu Zhangjin
    Cc: linux-mips@linux-mips.org
    Cc: Steven Rostedt
    Cc: Frederic Weisbecker
    Cc: Ingo Molnar
    Patchwork: http://patchwork.linux-mips.org/patch/1044/
    Signed-off-by: Ralf Baechle

    Wu Zhangjin
     

30 Mar, 2010

1 commit

  • 5a0e3ad6a   include cleanup: Update gfp.h and slab.h includes to prepare for breaking implic… ... Browse Code »

    …it slab.h inclusion from percpu.h

    percpu.h is included by sched.h and module.h and thus ends up being
    included when building most .c files. percpu.h includes slab.h which
    in turn includes gfp.h making everything defined by the two files
    universally available and complicating inclusion dependencies.

    percpu.h -> slab.h dependency is about to be removed. Prepare for
    this change by updating users of gfp and slab facilities include those
    headers directly instead of assuming availability. As this conversion
    needs to touch large number of source files, the following script is
    used as the basis of conversion.

    http://userweb.kernel.org/~tj/misc/slabh-sweep.py

    The script does the followings.

    * Scan files for gfp and slab usages and update includes such that
    only the necessary includes are there. ie. if only gfp is used,
    gfp.h, if slab is used, slab.h.

    * When the script inserts a new include, it looks at the include
    blocks and try to put the new include such that its order conforms
    to its surrounding. It's put in the include block which contains
    core kernel includes, in the same order that the rest are ordered -
    alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
    doesn't seem to be any matching order.

    * If the script can't find a place to put a new include (mostly
    because the file doesn't have fitting include block), it prints out
    an error message indicating which .h file needs to be added to the
    file.

    The conversion was done in the following steps.

    1. The initial automatic conversion of all .c files updated slightly
    over 4000 files, deleting around 700 includes and adding ~480 gfp.h
    and ~3000 slab.h inclusions. The script emitted errors for ~400
    files.

    2. Each error was manually checked. Some didn't need the inclusion,
    some needed manual addition while adding it to implementation .h or
    embedding .c file was more appropriate for others. This step added
    inclusions to around 150 files.

    3. The script was run again and the output was compared to the edits
    from #2 to make sure no file was left behind.

    4. Several build tests were done and a couple of problems were fixed.
    e.g. lib/decompress_*.c used malloc/free() wrappers around slab
    APIs requiring slab.h to be added manually.

    5. The script was run on all .h files but without automatically
    editing them as sprinkling gfp.h and slab.h inclusions around .h
    files could easily lead to inclusion dependency hell. Most gfp.h
    inclusion directives were ignored as stuff from gfp.h was usually
    wildly available and often used in preprocessor macros. Each
    slab.h inclusion directive was examined and added manually as
    necessary.

    6. percpu.h was updated not to include slab.h.

    7. Build test were done on the following configurations and failures
    were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
    distributed build env didn't work with gcov compiles) and a few
    more options had to be turned off depending on archs to make things
    build (like ipr on powerpc/64 which failed due to missing writeq).

    * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
    * powerpc and powerpc64 SMP allmodconfig
    * sparc and sparc64 SMP allmodconfig
    * ia64 SMP allmodconfig
    * s390 SMP allmodconfig
    * alpha SMP allmodconfig
    * um on x86_64 SMP allmodconfig

    8. percpu.h modifications were reverted so that it could be applied as
    a separate patch and serve as bisection point.

    Given the fact that I had only a couple of failures from tests on step
    6, I'm fairly confident about the coverage of this conversion patch.
    If there is a breakage, it's likely to be something in one of the arch
    headers which should be easily discoverable easily on most builds of
    the specific arch.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>

    Tejun Heo
     

04 Aug, 2009

1 commit

  • 484889fc8   MIPS: Avoid clobbering struct pt_regs in kthreads ... Browse Code »

    The resume() implementation octeon_switch.S examines the saved cp0_status
    register. We were clobbering the entire pt_regs structure in kernel
    threads leading to random crashes.

    When switching away from a kernel thread, the saved cp0_status is examined
    and if bit 30 is set it is cleared and the CP2 state saved into the pt_regs
    structure. Since the kernel thread stack overlaid the pt_regs structure
    this resulted in a corrupt stack. When the kthread with the corrupt stack
    was resumed, it could crash if it used any of the data in the stack that was
    clobbered.

    We fix it by moving the kernel thread stack down so it doesn't overlay
    pt_regs.

    Signed-off-by: David Daney
    Signed-off-by: Ralf Baechle

    David Daney
     

25 Jun, 2009

1 commit

  • 1b2bc75c1   MIPS: Add arch generic CPU hotplug ... Browse Code »

    Each platform has to add support for CPU hotplugging itself by providing
    suitable definitions for the cpu_disable and cpu_die of the smp_ops
    methods and setting SYS_SUPPORTS_HOTPLUG_CPU. A platform should only set
    SYS_SUPPORTS_HOTPLUG_CPU once all it's smp_ops definitions have the
    necessary changes. This patch contains the changes to the dummy smp_ops
    definition for uni-processor systems.

    Parts of the code contributed by Cavium Inc.

    Signed-off-by: Ralf Baechle

    Ralf Baechle
     

03 Apr, 2009

1 commit

14 Oct, 2008

1 commit

04 Oct, 2008

1 commit

21 Sep, 2008

1 commit

07 Sep, 2008

1 commit

19 Jul, 2008

2 commits

  • 9b610fda0   Merge branch 'linus' into timers/nohz Browse Code »
    Ingo Molnar
     
  • b8f8c3cf0   nohz: prevent tick stop outside of the idle loop ... Browse Code »

    Jack Ren and Eric Miao tracked down the following long standing
    problem in the NOHZ code:

    scheduler switch to idle task
    enable interrupts

    Window starts here

    ----> interrupt happens (does not set NEED_RESCHED)
    irq_exit() stops the tick

    ----> interrupt happens (does set NEED_RESCHED)

    return from schedule()

    cpu_idle(): preempt_disable();

    Window ends here

    The interrupts can happen at any point inside the race window. The
    first interrupt stops the tick, the second one causes the scheduler to
    rerun and switch away from idle again and we end up with the tick
    disabled.

    The fact that it needs two interrupts where the first one does not set
    NEED_RESCHED and the second one does made the bug obscure and extremly
    hard to reproduce and analyse. Kudos to Jack and Eric.

    Solution: Limit the NOHZ functionality to the idle loop to make sure
    that we can not run into such a situation ever again.

    cpu_idle()
    {
    preempt_disable();

    while(1) {
    tick_nohz_stop_sched_tick(1); ,
    Debugged-by: eric miao
    Signed-off-by: Thomas Gleixner

    Thomas Gleixner
     

16 Jul, 2008

1 commit

15 Dec, 2007

1 commit

12 Oct, 2007

3 commits

01 Aug, 2007

1 commit

21 Jul, 2007

1 commit

11 Jul, 2007

1 commit

27 Feb, 2007

1 commit

19 Feb, 2007

2 commits

07 Feb, 2007

1 commit

20 Oct, 2006

1 commit

10 Oct, 2006

1 commit

02 Oct, 2006

2 commits

27 Sep, 2006

6 commits

  • b59431825   [MIPS] get_wchan(): remove uses of mfinfo[64] ... Browse Code »

    This array was used to 'cache' some frame info about scheduler
    functions to speed up get_wchan(). This array was 1Ko size and
    was only used when CONFIG_KALLSYMS was set but declared for all
    configs.

    Rather than make the array statement conditional, this patches
    removes this array and its uses. Indeed the common case doesn't
    seem to use this array and get_wchan() is not a critical path
    anyways.

    It results in a smaller bss and a smaller/cleaner code:

    text data bss dec hex filename
    2543808 254148 139296 2937252 2cd1a4 vmlinux-new-get-wchan
    2544080 254148 143392 2941620 2ce2b4 vmlinux~old

    Signed-off-by: Franck Bui-Huu
    Signed-off-by: Ralf Baechle

    Franck Bui-Huu
     
  • 29b376ff1   [MIPS] get_frame_info(): null function size means size is unknown ... Browse Code »

    This patch adds 2 sanity checks.

    The first one test that the start address of the function to analyze has been
    set by the caller. If not return an error since nothing usefull can be done
    without.

    The second one checks that the function's size has been set. A null size can
    happen if CONFIG_KALLSYMS is not set and it means that we don't know the size
    of the function to analyze. In this case, we make it equal to 128 instructions
    by default.

    Signed-off-by: Franck Bui-Huu
    Signed-off-by: Ralf Baechle

    Franck Bui-Huu
     
  • 1fd690980   [MIPS] unwind_stack(): return ra if an exception occured at the first instruction ... Browse Code »

    Signed-off-by: Franck Bui-Huu
    Signed-off-by: Ralf Baechle

    Franck Bui-Huu
     
  • 4d157d5ea   [MIPS] Improve unwind_stack() ... Browse Code »

    This patch allows unwind_stack() to return ra for leaf function.
    But it tries to detects cases where get_frame_info() wrongly
    consider nested function as a leaf one.

    It also pass 'unsinged long *sp' instead of 'unsigned long **sp'
    as second parameter. The code looks cleaner.

    Signed-off-by: Franck Bui-Huu
    Signed-off-by: Ralf Baechle

    Franck Bui-Huu
     
  • 0cceb4aa9   [MIPS] Make get_frame_info() more robust ... Browse Code »

    Now get_frame_info() wants to detect move sp instruction first. It
    assumes that the save ra in the stack instruction can't happen
    before allocating frame size space into the stack.

    Signed-off-by: Franck Bui-Huu
    Signed-off-by: Ralf Baechle

    Franck Bui-Huu
     
  • 6057a7987   [MIPS] Make frame_info_init() more readable. ... Browse Code »

    Signed-off-by: Franck Bui-Huu
    Signed-off-by: Ralf Baechle

    Franck Bui-Huu