Eric Lee / smarc-fsl-linux-kernel

27 Jul, 2011

1 commit

  • 60063497a   atomic: use <linux/atomic.h> ... Browse Code »

    This allows us to move duplicated code in
    (atomic_inc_not_zero() for now) to

    Signed-off-by: Arun Sharma
    Reviewed-by: Eric Dumazet
    Cc: Ingo Molnar
    Cc: David Miller
    Cc: Eric Dumazet
    Acked-by: Mike Frysinger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Arun Sharma
     

08 Jun, 2011

1 commit

  • 2e65d1f6e   MN10300: Fix one of the kernel debugger cacheflush variants ... Browse Code »

    One of the kernel debugger cacheflush variants escaped proper testing. Two of
    the labels are wrong, being derived from the code that was copied to construct
    the variant.

    The first label results in the following assembler message:

    AS arch/mn10300/mm/cache-dbg-flush-by-reg.o
    arch/mn10300/mm/cache-dbg-flush-by-reg.S: Assembler messages:
    arch/mn10300/mm/cache-dbg-flush-by-reg.S:123: Error: symbol `debugger_local_cache_flushinv_no_dcache' is already defined

    And the second label results in the following linker message:

    arch/mn10300/mm/built-in.o:(.text+0x1d39): undefined reference to `mn10300_local_icache_inv_range_reg_end'
    arch/mn10300/mm/built-in.o:(.text+0x1d39): relocation truncated to fit: R_MN10300_PCREL16 against undefined symbol `mn10300_local_icache_inv_range_reg_end'

    To test this file the following configuration pieces must be set:

    CONFIG_AM34=y
    CONFIG_MN10300_CACHE_WBACK=y
    CONFIG_MN10300_DEBUGGER_CACHE_FLUSH_BY_REG=y
    CONFIG_MN10300_CACHE_MANAGE_BY_REG=y
    CONFIG_AM34_HAS_CACHE_SNOOP=n

    Signed-off-by: David Howells
    Signed-off-by: Linus Torvalds

    David Howells
     

25 May, 2011

2 commits

  • 8ea9716fd   mn10300: convert old cpumask API into new one ... Browse Code »

    Adapt to the new API.

    We plan to remove old cpumask APIs later. Thus this patch converts them
    into the new one.

    Signed-off-by: KOSAKI Motohiro
    Cc: David Howells
    Cc: Koichi Yasutake
    Cc: Hugh Dickins
    Cc: Chris Metcalf
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    KOSAKI Motohiro
     
  • 1c3951769   mm: now that all old mmu_gather code is gone, remove the storage ... Browse Code »

    Fold all the mmu_gather rework patches into one for submission

    Signed-off-by: Peter Zijlstra
    Reported-by: Hugh Dickins
    Cc: Benjamin Herrenschmidt
    Cc: David Miller
    Cc: Martin Schwidefsky
    Cc: Russell King
    Cc: Paul Mundt
    Cc: Jeff Dike
    Cc: Richard Weinberger
    Cc: Tony Luck
    Cc: KAMEZAWA Hiroyuki
    Cc: Mel Gorman
    Cc: KOSAKI Motohiro
    Cc: Nick Piggin
    Cc: Namhyung Kim
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Peter Zijlstra
     

19 Mar, 2011

3 commits

  • 67ddb4052   MN10300: Create generic kernel debugger hooks ... Browse Code »

    Create generic kernel debugger hooks in the MN10300 arch and make gdbstub use
    them. This is a preparation for KGDB support.

    Signed-off-by: David Howells

    David Howells
     
  • 7f386ac32   MN10300: Create general kernel debugger cache flushing ... Browse Code »

    Create general kernel debugger cache flushing for MN10300 and get rid of the
    old stuff that gdbstub was using.

    Signed-off-by: David Howells

    David Howells
     
  • b75bb2365   MN10300: The icache invalidate functions should disable the icache first ... Browse Code »

    The icache invalidate functions should disable the icache on AM33 and wait for
    it to quiesce before attempting to invalidate it, and should then wait for it
    to quiesce again before reenabling it, but on AM34 they should invalidate
    directly. The same goes for the dcache invalidation, but this isn't used much.

    Whilst we're at it, this can be wrapped in assembler macros to remove duplicate
    code.

    The AM33 manual states that:

    An operation that invalidates the cache, switches the writing mode, or
    changes the way mode must be performed after disabling the cache,
    checking the busy bit, and confirming that the cache is not in
    operation.

    for the dcache [sec 2.8.3.2.1]. This is not stated so for the icache [sec
    2.8.3.1.1] but the example code there suggests that it is.

    Whilst the AM34 manual states that the cache must be disabled for both the
    icache [sec 1.8.3.2.1] and the dcache [sec 1.8.3.2.1], the Panasonic hardware
    engineers say the manual is wrong and that disabling the caches for
    invalidation is wrong.

    Furthermore, they say that disabling the caches on the AM34 whilst running an
    SMP kernel can lead to incoherency between the various CPU caches and should
    thus be avoided.

    Signed-off-by: David Howells

    David Howells
     

14 Mar, 2011

1 commit

28 Oct, 2010

17 commits

02 Oct, 2010

1 commit

  • 57cf4f78c   MN10300: Fix flush_icache_range() ... Browse Code »

    flush_icache_range() is given virtual addresses to describe the region. It
    deals with these by attempting to translate them through the current set of
    page tables.

    This is fine for userspace memory and vmalloc()'d areas as they are governed by
    page tables. However, since the regions above 0x80000000 aren't translated
    through the page tables by the MMU, the kernel doesn't bother to set up page
    tables for them (see paging_init()).

    This means flush_icache_range() as it stands cannot be used to flush regions of
    the VM area between 0x80000000 and 0x9fffffff where the kernel resides if the
    data cache is operating in WriteBack mode.

    To fix this, make flush_icache_range() first check for addresses in the upper
    half of VM space and deal with them appropriately, before dealing with any
    range in the page table mapped area.

    Ordinarily, this is not a problem, but it has the capacity to make kprobes and
    kgdb malfunction. It should not affect gdbstub, signal frame setup or module
    loading as gdb has its own flush functions, and the others take place in the
    page table mapped area only.

    Signed-off-by: David Howells
    Acked-by: Akira Takeuchi
    Signed-off-by: Linus Torvalds

    David Howells
     

29 Sep, 2010

1 commit

  • 62bdb288b   MN10300: Handle missing sys_cacheflush() when caching disabled ... Browse Code »

    When caching is disabled on the MN10300 arch, the sys_cacheflush()
    function is removed by conditional stuff in the makefiles, but is still
    referred to by the syscall table.

    Provide a null version that just returns 0 when caching is disabled (or
    -EINVAL if the arguments are silly).

    Signed-off-by: David Howells
    Signed-off-by: Linus Torvalds

    David Howells
     

24 Aug, 2010

1 commit

  • 6e0c64f4d   arch/mn10300/mm: eliminate NULL dereference ... Browse Code »

    dev_name always dereferences its argument, so it should not be called if
    the argument is NULL. The function indeed later tests the argument for
    being NULL.

    The semantic match that finds this problem is as follows:
    (http://coccinelle.lip6.fr/)

    //
    @@
    expression dev,E;
    @@

    *dev_name(dev)
    ... when != dev = E
    (
    *dev == NULL
    |
    *dev != NULL
    )
    //

    Signed-off-by: Julia Lawall
    Signed-off-by: David Howells
    Signed-off-by: Linus Torvalds

    Julia Lawall
     

05 Jun, 2010

1 commit

  • c421b08ef   mn10300: invoke oom-killer from page fault ... Browse Code »

    As explained in commit 1c0fe6e3bd ("mm: invoke oom-killer from page
    fault") , we want to call the architecture independent oom killer when
    getting an unexplained OOM from handle_mm_fault, rather than simply
    killing current.

    Signed-off-by: Nick Piggin
    Acked-by: David Rientjes
    Acked-by: David Howells
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     

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
     

21 Feb, 2010

1 commit

  • 4b3073e1c   MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself ... Browse Code »

    On VIVT ARM, when we have multiple shared mappings of the same file
    in the same MM, we need to ensure that we have coherency across all
    copies. We do this via make_coherent() by making the pages
    uncacheable.

    This used to work fine, until we allowed highmem with highpte - we
    now have a page table which is mapped as required, and is not available
    for modification via update_mmu_cache().

    Ralf Beache suggested getting rid of the PTE value passed to
    update_mmu_cache():

    On MIPS update_mmu_cache() calls __update_tlb() which walks pagetables
    to construct a pointer to the pte again. Passing a pte_t * is much
    more elegant. Maybe we might even replace the pte argument with the
    pte_t?

    Ben Herrenschmidt would also like the pte pointer for PowerPC:

    Passing the ptep in there is exactly what I want. I want that
    -instead- of the PTE value, because I have issue on some ppc cases,
    for I$/D$ coherency, where set_pte_at() may decide to mask out the
    _PAGE_EXEC.

    So, pass in the mapped page table pointer into update_mmu_cache(), and
    remove the PTE value, updating all implementations and call sites to
    suit.

    Includes a fix from Stephen Rothwell:

    sparc: fix fallout from update_mmu_cache API change

    Signed-off-by: Stephen Rothwell

    Acked-by: Benjamin Herrenschmidt
    Signed-off-by: Russell King

    Russell King
     

12 Jan, 2010

3 commits

  • 012c79bad   mn10300: make the ASB2305's PCnet32 NIC work by using the PCI bridge's SRAM ... Browse Code »

    Access to the ASB2305's PCnet32 NIC doesn't work correctly because when
    the NIC attempts to update the ring buffer flags by DMA, the change to RAM
    crops up about 17uS after the interrupt line is asserted. This is almost
    certainly due to a bug in the PCI bridge FPGA on that board.

    We can get around this by making dma_alloc_coherent() put the ring buffer
    in the SRAM attached to the PCI bridge rather than in the SDRAM.

    Signed-off-by: David Howells
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    David Howells
     
  • d6bb7a1ad   mn10300: add cc clobbers to asm statements ... Browse Code »

    gcc 4.2.1 for MN10300 is more agressive than the older gcc in
    reordering/moving other insns between an insn that sets flags and an insn
    that uses those flags. This leads to trouble with asm statements which
    are missing an explicit "cc" clobber. This patch adds the explicit "cc"
    clobber to asm statements which do indeed clobber the condition flags.

    Signed-off-by: Mark Salter
    Signed-off-by: David Howells
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Mark Salter
     
  • 4b529401c   mm: make totalhigh_pages unsigned long ... Browse Code »

    Makes it consistent with the extern declaration, used when CONFIG_HIGHMEM
    is set Removes redundant casts in printout messages

    Signed-off-by: Andreas Fenkart
    Acked-by: Russell King
    Cc: Ralf Baechle
    Cc: David Howells
    Cc: Ingo Molnar
    Cc: Thomas Gleixner
    Cc: "H. Peter Anvin"
    Cc: Chen Liqin
    Cc: Lennox Wu
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Andreas Fenkart
     

22 Sep, 2009

1 commit

  • cc013a889   arches: drop superfluous casts in nr_free_pages() callers ... Browse Code »

    Commit 96177299416dbccb73b54e6b344260154a445375 ("Drop free_pages()")
    modified nr_free_pages() to return 'unsigned long' instead of 'unsigned
    int'. This made the casts to 'unsigned long' in most callers superfluous,
    so remove them.

    [akpm@linux-foundation.org: coding-style fixes]
    Signed-off-by: Geert Uytterhoeven
    Reviewed-by: Christoph Lameter
    Acked-by: Ingo Molnar
    Acked-by: Russell King
    Acked-by: David S. Miller
    Acked-by: Kyle McMartin
    Acked-by: WANG Cong
    Cc: Richard Henderson
    Cc: Ivan Kokshaysky
    Cc: Haavard Skinnemoen
    Cc: Mikael Starvik
    Cc: "Luck, Tony"
    Cc: Hirokazu Takata
    Cc: Ralf Baechle
    Cc: David Howells
    Acked-by: Benjamin Herrenschmidt
    Cc: Martin Schwidefsky
    Cc: Paul Mundt
    Cc: Chris Zankel
    Cc: Michal Simek
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Geert Uytterhoeven
     

13 Jul, 2009

1 commit

  • 405f55712   headers: smp_lock.h redux ... Browse Code »

    * Remove smp_lock.h from files which don't need it (including some headers!)
    * Add smp_lock.h to files which do need it
    * Make smp_lock.h include conditional in hardirq.h
    It's needed only for one kernel_locked() usage which is under CONFIG_PREEMPT

    This will make hardirq.h inclusion cheaper for every PREEMPT=n config
    (which includes allmodconfig/allyesconfig, BTW)

    Signed-off-by: Alexey Dobriyan
    Signed-off-by: Linus Torvalds

    Alexey Dobriyan
     

22 Jun, 2009

1 commit

  • d06063cc2   Move FAULT_FLAG_xyz into handle_mm_fault() callers ... Browse Code »

    This allows the callers to now pass down the full set of FAULT_FLAG_xyz
    flags to handle_mm_fault(). All callers have been (mechanically)
    converted to the new calling convention, there's almost certainly room
    for architectures to clean up their code and then add FAULT_FLAG_RETRY
    when that support is added.

    Signed-off-by: Linus Torvalds

    Linus Torvalds
     

12 Jun, 2009

1 commit

13 Nov, 2008

2 commits