Eric Lee / smarc-fsl-linux-kernel

02 Nov, 2011

18 commits

15 Sep, 2011

1 commit

  • fbfe9c847   um: Save FPU registers between task switches ... Browse Code »

    Some time ago Jeff prepared 42daba316557 ("uml: stop saving process FP
    state") for UML to stop saving the process FP state between task
    switches. The assumption was that since with SKAS0 every guest process
    runs inside a host process context the host OS will take care of keeping
    the proper FP state.

    Unfortunately this is not true for multi-threaded applications, where
    all guest threads share a single host process context yet all may use
    the FPU on their own. Although I haven't verified it I suspect things
    to be even worse in SKAS3 mode where all guest processes run inside a
    single host process.

    The patch reintroduces the saving and restoring of the FP context
    between task switches.

    [richard@nod.at: Ingo posted this patch in 2009, sadly it was never applied
    and got lost. Now in 2011 the problem was reported by Gunnar.]

    Signed-off-by: Ingo van Lil
    Signed-off-by: Richard Weinberger
    Reported-by:
    Tested-by:
    Cc: Stanislav Meduna
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Ingo van Lil
     

26 Jul, 2011

4 commits

  • b743ac54e   um: disable scan_elf_aux() on x86_64 ... Browse Code »

    Reusing the host's vDSO makes only sense on x86_32.

    Signed-off-by: Richard Weinberger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Richard Weinberger
     
  • 2a6d0ac18   uml: free resources ... Browse Code »

    When creating the temp file there's a memory and file descriptor leak upon
    error.

    Signed-off-by: Davidlohr Bueso
    Signed-off-by: Richard Weinberger
    Reviewed-by: Vitaliy Ivanov
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Davidlohr Bueso
     
  • 2fdf21309   uml: helper.c warning corrections ... Browse Code »

    Fix this warning:

    arch/um/os-Linux/helper.c: In function `helper_child':
    arch/um/os-Linux/helper.c:38:7: warning: ignoring return value of `write', declared with attribute warn_unused_result

    [richard@nod.at: happens only with -D_FORTIFY_SOURCE=2]
    Signed-off-by: Vitaliy Ivanov
    Signed-off-by: Richard Weinberger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Vitaliy Ivanov
     
  • f956b3e40   um: fix _FORTIFY_SOURCE=2 support for kernel modules ... Browse Code »

    When UML is compiled with _FORTIFY_SOURCE we have to export all _chk()
    functions which are used in modules. For now it's only the case for
    __sprintf_chk().

    Tested-by: Florian Fainelli
    Reported-by: Florian Fainelli
    Signed-off-by: Richard Weinberger
    Acked-by: Vitaliy Ivanov
    Cc: Geert Uytterhoeven
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Richard Weinberger
     

25 May, 2011

4 commits

18 May, 2011

1 commit

  • b2db21997   um: fix abort ... Browse Code »

    os_dump_core() uses abort() to terminate UML in case of an fatal error.

    glibc's abort() calls raise(SIGABRT) which makes use of tgkill().
    tgkill() has no effect within UML's kernel threads because they are not
    pthreads. As fallback abort() executes an invalid instruction to
    terminate the process. Therefore UML gets killed by SIGSEGV and leaves a
    ugly log entry in the host's kernel ring buffer.

    To get rid of this we use our own abort routine.

    Signed-off-by: Richard Weinberger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Richard Weinberger
     

27 Oct, 2010

1 commit

  • 482db6df1   um: fix global timer issue when using CONFIG_NO_HZ ... Browse Code »

    This fixes a issue which was introduced by fe2cc53e ("uml: track and make
    up lost ticks").

    timeval_to_ns() returns long long and not int. Due to that UML's timer
    did not work properlt and caused timer freezes.

    Signed-off-by: Richard Weinberger
    Acked-by: Pekka Enberg
    Cc: Jeff Dike
    Cc:
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Richard Weinberger
     

10 Aug, 2010

1 commit

30 Jun, 2010

1 commit

  • fb967ecc5   um: os-linux/mem.c needs sys/stat.h ... Browse Code »

    The os-linux/mem.c file calls fchmod function, which is declared in sys/stat.h
    header file, so include it. Fixes build breakage under FC13.

    Signed-off-by: Liu Aleaxander
    Acked-by: Boaz Harrosh
    Cc: Jeff Dike
    Cc:
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Liu Aleaxander
     

19 Apr, 2010

1 commit

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
     

20 Sep, 2009

1 commit

01 Apr, 2009

1 commit

13 Mar, 2009

1 commit

  • 00699e847   uml: fix WARNING: vmlinux: 'memcpy' exported twice ... Browse Code »

    Fix the following warning on x86_64:

    LD vmlinux.o
    MODPOST vmlinux.o
    WARNING: vmlinux: 'memcpy' exported twice. Previous export was in vmlinux

    For x86_64, this symbol is already exported from arch/um/sys-x86_64/ksyms.c.

    Reported-by: Boaz Harrosh
    Signed-off-by: WANG Cong
    Tested-by: Boaz Harrosh
    Cc: Jeff Dike
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    akpm@linux-foundation.org
     

05 Dec, 2008

1 commit

23 Oct, 2008

2 commits

17 Oct, 2008

1 commit