Eric Lee / smarc-fsl-linux-kernel

03 May, 2008

1 commit

29 Apr, 2008

1 commit

  • 6510d4195   kernel: Move arches to use common unaligned access ... Browse Code »

    Unaligned access is ok for the following arches:
    cris, m68k, mn10300, powerpc, s390, x86

    Arches that use the memmove implementation for native endian, and
    the byteshifting for the opposite endianness.
    h8300, m32r, xtensa

    Packed struct for native endian, byteshifting for other endian:
    alpha, blackfin, ia64, parisc, sparc, sparc64, mips, sh

    m86knommu is generic_be for Coldfire, otherwise unaligned access is ok.

    frv, arm chooses endianness based on compiler settings, uses the byteshifting
    versions. Remove the unaligned trap handler from frv as it is now unused.

    v850 is le, uses the byteshifting versions for both be and le.

    Remove the now unused asm-generic implementation.

    Signed-off-by: Harvey Harrison
    Acked-by: David S. Miller
    Cc:
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Harvey Harrison
     

28 Apr, 2008

2 commits

  • 16a26ef5a   cris: add constfy to pgd_offset() ... Browse Code »

    add constfy to pgd_offset() for avoid following warnings.

    CC mm/pagewalk.o
    mm/pagewalk.c: In function 'walk_page_range':
    mm/pagewalk.c:111: warning: passing argument 1 of 'pgd_offset' discards qualifiers from p\
    ointer target type

    Signed-off-by: KOSAKI Motohiro
    Cc: Matt Mackall
    Cc: "Vegard Nossum"
    Cc: Mikael Starvik
    Cc: Jesper Nilsson
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    KOSAKI Motohiro
     
  • 7e675137a   mm: introduce pte_special pte bit ... Browse Code »

    s390 for one, cannot implement VM_MIXEDMAP with pfn_valid, due to their memory
    model (which is more dynamic than most). Instead, they had proposed to
    implement it with an additional path through vm_normal_page(), using a bit in
    the pte to determine whether or not the page should be refcounted:

    vm_normal_page()
    {
    ...
    if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
    if (vma->vm_flags & VM_MIXEDMAP) {
    #ifdef s390
    if (!mixedmap_refcount_pte(pte))
    return NULL;
    #else
    if (!pfn_valid(pfn))
    return NULL;
    #endif
    goto out;
    }
    ...
    }

    This is fine, however if we are allowed to use a bit in the pte to determine
    refcountedness, we can use that to _completely_ replace all the vma based
    schemes. So instead of adding more cases to the already complex vma-based
    scheme, we can have a clearly seperate and simple pte-based scheme (and get
    slightly better code generation in the process):

    vm_normal_page()
    {
    #ifdef s390
    if (!mixedmap_refcount_pte(pte))
    return NULL;
    return pte_page(pte);
    #else
    ...
    #endif
    }

    And finally, we may rather make this concept usable by any architecture rather
    than making it s390 only, so implement a new type of pte state for this.
    Unfortunately the old vma based code must stay, because some architectures may
    not be able to spare pte bits. This makes vm_normal_page a little bit more
    ugly than we would like, but the 2 cases are clearly seperate.

    So introduce a pte_special pte state, and use it in mm/memory.c. It is
    currently a noop for all architectures, so this doesn't actually result in any
    compiled code changes to mm/memory.o.

    BTW:
    I haven't put vm_normal_page() into arch code as-per an earlier suggestion.
    The reason is that, regardless of where vm_normal_page is actually
    implemented, the *abstraction* is still exactly the same. Also, while it
    depends on whether the architecture has pte_special or not, that is the
    only two possible cases, and it really isn't an arch specific function --
    the role of the arch code should be to provide primitive functions and
    accessors with which to build the core code; pte_special does that. We do
    not want architectures to know or care about vm_normal_page itself, and
    we definitely don't want them being able to invent something new there
    out of sight of mm/ code. If we made vm_normal_page an arch function, then
    we have to make vm_insert_mixed (next patch) an arch function too. So I
    don't think moving it to arch code fundamentally improves any abstractions,
    while it does practically make the code more difficult to follow, for both
    mm and arch developers, and easier to misuse.

    [akpm@linux-foundation.org: build fix]
    Signed-off-by: Nick Piggin
    Acked-by: Carsten Otte
    Cc: Jared Hulbert
    Cc: Martin Schwidefsky
    Cc: Heiko Carstens
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     

27 Apr, 2008

1 commit

  • 4c3032d8a   ide: add struct ide_io_ports (take 3) ... Browse Code »

    * Add struct ide_io_ports and use it instead of `unsigned long io_ports[]`
    in ide_hwif_t.

    * Rename io_ports[] in hw_regs_t to io_ports_array[].

    * Use un-named union for 'unsigned long io_ports_array[]' and 'struct
    ide_io_ports io_ports' in hw_regs_t.

    * Remove IDE_*_OFFSET defines.

    v2:
    * scc_pata.c build fix from Stephen Rothwell.

    v3:
    * Fix ctl_adrr typo in Sparc-specific part of ns87415.c.
    (Noticed by Andrew Morton)

    Signed-off-by: Bartlomiej Zolnierkiewicz

    Bartlomiej Zolnierkiewicz
     

17 Apr, 2008

1 commit

  • 64ac24e73   Generic semaphore implementation ... Browse Code »
    44

    Semaphores are no longer performance-critical, so a generic C
    implementation is better for maintainability, debuggability and
    extensibility. Thanks to Peter Zijlstra for fixing the lockdep
    warning. Thanks to Harvey Harrison for pointing out that the
    unlikely() was unnecessary.

    Signed-off-by: Matthew Wilcox
    Acked-by: Ingo Molnar

    Matthew Wilcox
     

03 Apr, 2008

1 commit

  • dd135ebbd   kvm: provide kvm.h for all architecture: fixes headers_install ... Browse Code »

    Currently include/linux/kvm.h is not considered by make headers_install,
    because Kbuild cannot handle " unifdef-$(CONFIG_FOO) += foo.h. This problem
    was introduced by

    commit fb56dbb31c4738a3918db81fd24da732ce3b4ae6
    Author: Avi Kivity
    Date: Sun Dec 2 10:50:06 2007 +0200

    KVM: Export include/linux/kvm.h only if $ARCH actually supports KVM

    Currently, make headers_check barfs due to , which
    includes, not existing. Rather than add a zillion s, export kvm.
    only if the arch actually supports it.

    Signed-off-by: Avi Kivity

    which makes this an 2.6.25 regression.

    One way of solving the issue is to enhance Kbuild, but Avi and David conviced
    me, that changing headers_install is not the way to go. This patch changes
    the definition for linux/kvm.h to unifdef-y.

    If  unifdef-y is used for linux/kvm.h "make headers_check" will fail on all
    architectures without asm/kvm.h. Therefore, this patch also provides
    asm/kvm.h on all architectures.

    Signed-off-by: Christian Borntraeger
    Acked-by: Avi Kivity
    Cc: Sam Ravnborg
    Cc:
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Christian Borntraeger
     

05 Mar, 2008

2 commits

09 Feb, 2008

6 commits

  • 0cf975e16   Merge branch 'cris' of git://www.jni.nu/cris ... Browse Code »

    * 'cris' of git://www.jni.nu/cris: (158 commits)
    CRIS v32: Remove hwregs/timer_defs.h, it is now architecture specific.
    CRIS v32: Change drivers/i2c.c locking.
    CRIS v32: Rewrite ARTPEC-3 gpio driver to avoid volatiles and general cleanup.
    CRIS: Add new timerfd syscall entries.
    MAINTAINERS: Add my information for the CRIS port.
    CRIS v32: Correct spelling of bandwidth in function name.
    CRIS v32: Clean up nandflash.c for ARTPEC-3 and ETRAX FS.
    CRIS v10: Cleanup of drivers/gpio.c
    CRIS v10: drivers/net/cris/eth_v10.c rename LED defines to CRIS_LED to avoid name clash.
    CRIS: Make io_pwm_set_period members unsigned in etraxgpio.h
    CRIS: Move ETRAX_AXISFLASHMAP to common Kconfig file.
    CRIS: Drop regs parameter from call to profile_tick in kernel/time.c
    CRIS v32: Fix minor formatting issue in mach-a3/io.c
    CRIS v32: Initialize GIO even if we're rambooting in kernel/head.S
    CRIS v32: Remove kernel/arbiter.c, it now exists in machine dependent directory.
    CRIS v32: Minor changes to avoid errors in asm-cris/arch-v32/hwregs/reg_rdwr.h
    CRIS v32: arch-v32/hwregs/intr_vect_defs.h moved to machine dependent directory.
    CRIS v32: Correct offset for TASK_pid in asm-cris/arch-v32/offset.h
    CRIS v32: Move register map header to machine dependent directory.
    CRIS v32: Let compiler know that memory is clobbered after a break op.
    ...

    Linus Torvalds
     
  • 2f569afd9   CONFIG_HIGHPTE vs. sub-page page tables. ... Browse Code »

    Background: I've implemented 1K/2K page tables for s390. These sub-page
    page tables are required to properly support the s390 virtualization
    instruction with KVM. The SIE instruction requires that the page tables
    have 256 page table entries (pte) followed by 256 page status table entries
    (pgste). The pgstes are only required if the process is using the SIE
    instruction. The pgstes are updated by the hardware and by the hypervisor
    for a number of reasons, one of them is dirty and reference bit tracking.
    To avoid wasting memory the standard pte table allocation should return
    1K/2K (31/64 bit) and 2K/4K if the process is using SIE.

    Problem: Page size on s390 is 4K, page table size is 1K or 2K. That means
    the s390 version for pte_alloc_one cannot return a pointer to a struct
    page. Trouble is that with the CONFIG_HIGHPTE feature on x86 pte_alloc_one
    cannot return a pointer to a pte either, since that would require more than
    32 bit for the return value of pte_alloc_one (and the pte * would not be
    accessible since its not kmapped).

    Solution: The only solution I found to this dilemma is a new typedef: a
    pgtable_t. For s390 pgtable_t will be a (pte *) - to be introduced with a
    later patch. For everybody else it will be a (struct page *). The
    additional problem with the initialization of the ptl lock and the
    NR_PAGETABLE accounting is solved with a constructor pgtable_page_ctor and
    a destructor pgtable_page_dtor. The page table allocation and free
    functions need to call these two whenever a page table page is allocated or
    freed. pmd_populate will get a pgtable_t instead of a struct page pointer.
    To get the pgtable_t back from a pmd entry that has been installed with
    pmd_populate a new function pmd_pgtable is added. It replaces the pmd_page
    call in free_pte_range and apply_to_pte_range.

    Signed-off-by: Martin Schwidefsky
    Cc:
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Martin Schwidefsky
     
  • bdc807871   avoid overflows in kernel/time.c ... Browse Code »

    When the conversion factor between jiffies and milli- or microseconds is
    not a single multiply or divide, as for the case of HZ == 300, we currently
    do a multiply followed by a divide. The intervening result, however, is
    subject to overflows, especially since the fraction is not simplified (for
    HZ == 300, we multiply by 300 and divide by 1000).

    This is exposed to the user when passing a large timeout to poll(), for
    example.

    This patch replaces the multiply-divide with a reciprocal multiplication on
    32-bit platforms. When the input is an unsigned long, there is no portable
    way to do this on 64-bit platforms there is no portable way to do this
    since it requires a 128-bit intermediate result (which gcc does support on
    64-bit platforms but may generate libgcc calls, e.g. on 64-bit s390), but
    since the output is a 32-bit integer in the cases affected, just simplify
    the multiply-divide (*3/10 instead of *300/1000).

    The reciprocal multiply used can have off-by-one errors in the upper half
    of the valid output range. This could be avoided at the expense of having
    to deal with a potential 65-bit intermediate result. Since the intent is
    to avoid overflow problems and most of the other time conversions are only
    semiexact, the off-by-one errors were considered an acceptable tradeoff.

    At Ralf Baechle's suggestion, this version uses a Perl script to compute
    the necessary constants. We already have dependencies on Perl for kernel
    compiles. This does, however, require the Perl module Math::BigInt, which
    is included in the standard Perl distribution starting with version 5.8.0.
    In order to support older versions of Perl, include a table of canned
    constants in the script itself, and structure the script so that
    Math::BigInt isn't required if pulling values from said table.

    Running the script requires that the HZ value is available from the
    Makefile. Thus, this patch also adds the Kconfig variable CONFIG_HZ to the
    architectures which didn't already have it (alpha, cris, frv, h8300, m32r,
    m68k, m68knommu, sparc, v850, and xtensa.) It does *not* touch the sh or
    sh64 architectures, since Paul Mundt has dealt with those separately in the
    sh tree.

    Signed-off-by: H. Peter Anvin
    Cc: Ralf Baechle ,
    Cc: Sam Ravnborg ,
    Cc: Paul Mundt ,
    Cc: Richard Henderson ,
    Cc: Michael Starvik ,
    Cc: David Howells ,
    Cc: Yoshinori Sato ,
    Cc: Hirokazu Takata ,
    Cc: Geert Uytterhoeven ,
    Cc: Roman Zippel ,
    Cc: William L. Irwin ,
    Cc: Chris Zankel ,
    Cc: H. Peter Anvin ,
    Cc: Jan Engelhardt
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    H. Peter Anvin
     
  • 531d7d425   asm-*/posix_types.h: scrub __GLIBC__ ... Browse Code »

    Some arches (like alpha and ia64) already have a clean posix_types.h header.
    This brings all the others in line by removing all references to __GLIBC__
    (and some undocumented __USE_ALL).

    Signed-off-by: Mike Frysinger
    Acked-by: Ingo Molnar
    Cc: Ulrich Drepper
    Cc: Roland McGrath
    Cc:
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Mike Frysinger
     
  • 922a70d32   aout: move STACK_TOP[_MAX] to asm/processor.h ... Browse Code »

    Move STACK_TOP[_MAX] out of asm/a.out.h and into asm/processor.h as they're
    required whether or not A.OUT format is available.

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

    David Howells
     
  • bc10ac3f2   CRIS v32: Remove hwregs/timer_defs.h, it is now architecture specific. ... Browse Code »

    - File is moved to arch-v32/mach-fs/hwregs/timer_defs.h

    Jesper Nilsson
     

08 Feb, 2008

25 commits