Eric Lee / smarc-fsl-linux-kernel

25 May, 2011

1 commit

20 May, 2011

1 commit

  • a2d063ac2   extable, core_kernel_data(): Make sure all archs define _sdata ... Browse Code »
    43

    A new utility function (core_kernel_data()) is used to determine if a
    passed in address is part of core kernel data or not. It may or may not
    return true for RO data, but this utility must work for RW data.

    Thus both _sdata and _edata must be defined and continuous,
    without .init sections that may later be freed and replaced by
    volatile memory (memory that can be freed).

    This utility function is used to determine if data is safe from
    ever being freed. Thus it should return true for all RW global
    data that is not in a module or has been allocated, or false
    otherwise.

    Also change core_kernel_data() back to the more precise _sdata condition
    and document the function.

    Signed-off-by: Steven Rostedt
    Acked-by: Ralf Baechle
    Acked-by: Hirokazu Takata
    Cc: Richard Henderson
    Cc: Ivan Kokshaysky
    Cc: Matt Turner
    Cc: Geert Uytterhoeven
    Cc: Roman Zippel
    Cc: linux-m68k@lists.linux-m68k.org
    Cc: Kyle McMartin
    Cc: Helge Deller
    Cc: JamesE.J.Bottomley
    Link: http://lkml.kernel.org/r/1305855298.1465.19.camel@gandalf.stny.rr.com
    Signed-off-by: Ingo Molnar
    ----
    arch/alpha/kernel/vmlinux.lds.S | 1 +
    arch/m32r/kernel/vmlinux.lds.S | 1 +
    arch/m68k/kernel/vmlinux-std.lds | 2 ++
    arch/m68k/kernel/vmlinux-sun3.lds | 1 +
    arch/mips/kernel/vmlinux.lds.S | 1 +
    arch/parisc/kernel/vmlinux.lds.S | 3 +++
    kernel/extable.c | 12 +++++++++++-
    7 files changed, 20 insertions(+), 1 deletion(-)

    Steven Rostedt
     

25 Mar, 2011

1 commit

  • 0415b00d1   percpu: Always align percpu output section to PAGE_SIZE ... Browse Code »

    Percpu allocator honors alignment request upto PAGE_SIZE and both the
    percpu addresses in the percpu address space and the translated kernel
    addresses should be aligned accordingly. The calculation of the
    former depends on the alignment of percpu output section in the kernel
    image.

    The linker script macros PERCPU_VADDR() and PERCPU() are used to
    define this output section and the latter takes @align parameter.
    Several architectures are using @align smaller than PAGE_SIZE breaking
    percpu memory alignment.

    This patch removes @align parameter from PERCPU(), renames it to
    PERCPU_SECTION() and makes it always align to PAGE_SIZE. While at it,
    add PCPU_SETUP_BUG_ON() checks such that alignment problems are
    reliably detected and remove percpu alignment comment recently added
    in workqueue.c as the condition would trigger BUG way before reaching
    there.

    For um, this patch raises the alignment of percpu area. As the area
    is in .init, there shouldn't be any noticeable difference.

    This problem was discovered by David Howells while debugging boot
    failure on mn10300.

    Signed-off-by: Tejun Heo
    Acked-by: Mike Frysinger
    Cc: uclinux-dist-devel@blackfin.uclinux.org
    Cc: David Howells
    Cc: Jeff Dike
    Cc: user-mode-linux-devel@lists.sourceforge.net

    Tejun Heo
     

25 Jan, 2011

2 commits

  • 0f06c0636   alpha: use L1_CACHE_BYTES for cacheline size in the linker script ... Browse Code »

    Currently the linker script uses 64 for cacheline size which isn't
    optimal for all cases. Include asm/cache.h and use L1_CACHE_BYTES
    instead as suggested by Sam Ravnborg.

    Signed-off-by: Tejun Heo
    Cc: Sam Ravnborg

    Tejun Heo
     
  • 19df0c2fe   percpu: align percpu readmostly subsection to cacheline ... Browse Code »

    Currently percpu readmostly subsection may share cachelines with other
    percpu subsections which may result in unnecessary cacheline bounce
    and performance degradation.

    This patch adds @cacheline parameter to PERCPU() and PERCPU_VADDR()
    linker macros, makes each arch linker scripts specify its cacheline
    size and use it to align percpu subsections.

    This is based on Shaohua's x86 only patch.

    Signed-off-by: Tejun Heo
    Cc: Shaohua Li

    Tejun Heo
     

28 Sep, 2009

1 commit

27 Sep, 2009

1 commit

26 Sep, 2009

1 commit

25 Sep, 2009

2 commits

  • 9d93f0058   alpha: Clean up linker script using new linker script macros. ... Browse Code »

    Note that .data.page_aligned and .data.cacheline_aligned are now after
    _data; it was probably a bug that they were before it.

    Also, some explicit ALIGN(8)'s between various initcall sections were
    removed; this should be harmless as the implicit alignment of
    initcall_t was already 8.

    Signed-off-by: Geoffrey Thomas
    Signed-off-by: Tim Abbott
    Cc: Ivan Kokshaysky
    Cc: Sam Ravnborg
    Signed-off-by: Richard Henderson
    Signed-off-by: Linus Torvalds

    Geoffrey Thomas
     
  • ea12c2ed5   alpha: use .data.init_task instead of .data.init_thread. ... Browse Code »

    alpha is the only architecture that uses the section name
    .data.init_thread instead of .data.init_task. So convert alpha to use
    .data.init_task like everything else.

    .data.init_task does not need a separate output section; this change
    also moves it into the .data output section.

    Signed-off-by: Tim Abbott
    Cc: Richard Henderson
    Cc: linux-alpha@vger.kernel.org
    Signed-off-by: Linus Torvalds

    Tim Abbott
     

09 Jul, 2009

1 commit

  • 023bf6f1b   linker script: unify usage of discard definition ... Browse Code »

    Discarded sections in different archs share some commonality but have
    considerable differences. This led to linker script for each arch
    implementing its own /DISCARD/ definition, which makes maintaining
    tedious and adding new entries error-prone.

    This patch makes all linker scripts to move discard definitions to the
    end of the linker script and use the common DISCARDS macro. As ld
    uses the first matching section definition, archs can include default
    discarded sections by including them earlier in the linker script.

    ia64 is notable because it first throws away some ia64 specific
    subsections and then include the rest of the sections into the final
    image, so those sections must be discarded before the inclusion.

    defconfig compile tested for x86, x86-64, powerpc, powerpc64, ia64,
    alpha, sparc, sparc64 and s390. Michal Simek tested microblaze.

    Signed-off-by: Tejun Heo
    Acked-by: Paul Mundt
    Acked-by: Mike Frysinger
    Tested-by: Michal Simek
    Cc: linux-arch@vger.kernel.org
    Cc: Michal Simek
    Cc: microblaze-uclinux@itee.uq.edu.au
    Cc: Sam Ravnborg
    Cc: Tony Luck

    Tejun Heo
     

24 Jun, 2009

1 commit

  • 405d967dc   linker script: throw away .discard section ... Browse Code »

    x86 throws away .discard section but no other archs do. Also,
    .discard is not thrown away while linking modules. Make every arch
    and module linking throw it away. This will be used to define dummy
    variables for percpu declarations and definitions.

    This patch is based on Ivan Kokshaysky's alpha percpu patch.

    [ Impact: always throw away everything in .discard ]

    Signed-off-by: Tejun Heo
    Cc: Ivan Kokshaysky
    Cc: Richard Henderson
    Cc: Russell King
    Cc: Haavard Skinnemoen
    Cc: Bryan Wu
    Cc: Mikael Starvik
    Cc: Jesper Nilsson
    Cc: David Howells
    Cc: Yoshinori Sato
    Cc: Tony Luck
    Cc: Hirokazu Takata
    Cc: Geert Uytterhoeven
    Cc: Michal Simek
    Cc: Ralf Baechle
    Cc: Kyle McMartin
    Cc: Benjamin Herrenschmidt
    Cc: Paul Mackerras
    Cc: Martin Schwidefsky
    Cc: Heiko Carstens
    Cc: Paul Mundt
    Cc: David S. Miller
    Cc: Jeff Dike
    Cc: Chris Zankel
    Cc: Rusty Russell
    Cc: Ingo Molnar

    Tejun Heo
     

27 Apr, 2009

1 commit

  • 92ca52343   alpha: convert to use __HEAD and HEAD_TEXT macros. ... Browse Code »

    This has the consequence of changing the section name use for head
    code from ".text.head" to ".head.text". Since this commit changes all
    users in the architecture, this change should be harmless.

    Signed-off-by: Tim Abbott
    Cc: Richard Henderson
    Acked-by: Sam Ravnborg
    Signed-off-by: Linus Torvalds

    Tim Abbott
     

05 Jul, 2008

1 commit

  • 51597acfd   Alpha Linux kernel fails with inconsistent kallsyms data ... Browse Code »

    The build of the Alpha Linux kernel currently fails[1] with inconsistent
    kallsyms data. As I never saw that before, I thought about hardware
    problems. But in fact it is a bug in the Linux kernel.

    The end of the rodata section is marked with the "__end_rodata" symbol.
    This symbol have different aligning constraints than the inittext parts
    and therefor the start marked "_sinittext". Because of that the
    __end_rodata symbol shifts between < _sinittext and == _sinittext. The
    later variant is seen as a code symbol and recorded in the kallsyms data.

    On fix would be to move the exception table a little bit and get some
    space between that two areas.

    [1]: http://buildd.debian.org/fetch.cgi?pkg=linux-2.6&arch=alpha&ver=2.6.25-5&stamp=1213919009&file=log&as=raw

    Cc: maximilian attems
    Cc: Richard Henderson
    Cc: Ivan Kokshaysky
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Bastian Blank
     

29 Jan, 2008

1 commit

17 Oct, 2007

1 commit

  • b2b5d37d7   alpha: beautify vmlinux.lds ... Browse Code »

    Introduced a consistent style in vmlinux.lds and it now matches the
    soon-to-be common style for all arch's vmlinux.lds files.

    In addition:
    - Replaced hardcoded constant with PAGE_SIZE
    - Fix page.h so PAGE_SIZE can be used from assembler and in lds files
    - Move a few labels inside brackets so linker alignment will not
    make label point ot a too low address
    - Replaced DWARF and STABS sections with definitions from asm-generic

    Signed-off-by: Sam Ravnborg
    Cc: Ivan Kokshaysky
    Cc: Richard Henderson
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Sam Ravnborg
     

27 Jul, 2007

1 commit

20 Jul, 2007

2 commits

  • caf45dd92   alpha: Put allocated ELF notes in read-only data segment ... Browse Code »

    This changes the alpha linker script to use the asm-generic NOTES macro so
    that ELF note sections with SHF_ALLOC set are linked into the kernel image
    along with other read-only data. The PT_NOTE also points to their location.

    This paves the way for putting useful build-time information into ELF notes
    that can be found easily later in a kernel memory dump.

    Signed-off-by: Roland McGrath
    Cc: Richard Henderson
    Cc: Ivan Kokshaysky
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Roland McGrath
     
  • 5fb7dc37d   define new percpu interface for shared data ... Browse Code »

    per cpu data section contains two types of data. One set which is
    exclusively accessed by the local cpu and the other set which is per cpu,
    but also shared by remote cpus. In the current kernel, these two sets are
    not clearely separated out. This can potentially cause the same data
    cacheline shared between the two sets of data, which will result in
    unnecessary bouncing of the cacheline between cpus.

    One way to fix the problem is to cacheline align the remotely accessed per
    cpu data, both at the beginning and at the end. Because of the padding at
    both ends, this will likely cause some memory wastage and also the
    interface to achieve this is not clean.

    This patch:

    Moves the remotely accessed per cpu data (which is currently marked
    as ____cacheline_aligned_in_smp) into a different section, where all the data
    elements are cacheline aligned. And as such, this differentiates the local
    only data and remotely accessed data cleanly.

    Signed-off-by: Fenghua Yu
    Acked-by: Suresh Siddha
    Cc: Rusty Russell
    Cc: Christoph Lameter
    Cc:
    Cc: "Luck, Tony"
    Cc: Andi Kleen
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Fenghua Yu
     

19 May, 2007

2 commits

03 May, 2007

1 commit

  • b6e3590f8   [PATCH] x86: Allow percpu variables to be page-aligned ... Browse Code »

    Let's allow page-alignment in general for per-cpu data (wanted by Xen, and
    Ingo suggested KVM as well).

    Because larger alignments can use more room, we increase the max per-cpu
    memory to 64k rather than 32k: it's getting a little tight.

    Signed-off-by: Rusty Russell
    Signed-off-by: Jeremy Fitzhardinge
    Signed-off-by: Andi Kleen
    Acked-by: Ingo Molnar
    Cc: Andi Kleen
    Signed-off-by: Andrew Morton

    Jeremy Fitzhardinge
     

12 Feb, 2007

1 commit

  • 67d38229d   [PATCH] disable init/initramfs.c: architectures ... Browse Code »

    Update all arch/*/kernel/vmlinux.lds.S to not include space for initramfs
    when CONFIG_BLK_DEV_INITRAMFS is not selected. This saves another 4 kbytes
    on most platfoms (some reserve PAGE_SIZE for initramfs).

    Signed-off-by: Jean-Paul Saman
    Cc: Al Viro
    Cc:
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jean-Paul Saman
     

28 Oct, 2006

1 commit

  • 61ce1efe6   [PATCH] vmlinux.lds: consolidate initcall sections ... Browse Code »

    Add a vmlinux.lds.h helper macro for defining the eight-level initcall table,
    teach all the architectures to use it.

    This is a prerequisite for a patch which performs initcall synchronisation for
    multithreaded-probing.

    Cc: Greg KH
    Signed-off-by: Andrew Morton
    [ Added AVR32 as well ]
    Signed-off-by: Haavard Skinnemoen
    Signed-off-by: Linus Torvalds

    Andrew Morton
     

01 Jul, 2006

1 commit

17 Apr, 2005

1 commit

  • 1da177e4c   Linux-2.6.12-rc2 ... Browse Code »

    Initial git repository build. I'm not bothering with the full history,
    even though we have it. We can create a separate "historical" git
    archive of that later if we want to, and in the meantime it's about
    3.2GB when imported into git - space that would just make the early
    git days unnecessarily complicated, when we don't have a lot of good
    infrastructure for it.

    Let it rip!

    Linus Torvalds