Eric Lee / smarc-fsl-linux-kernel

18 Nov, 2011

1 commit

  • 303395ac3   x86: Generate system call tables and unistd_*.h from tables ... Browse Code »
    86

    Generate system call tables and unistd_*.h automatically from the
    tables in arch/x86/syscalls. All other information, like NR_syscalls,
    is auto-generated, some of which is in asm-offsets_*.c.

    This allows us to keep all the system call information in one place,
    and allows for kernel space and user space to see different
    information; this is currently used for the ia32 system call numbers
    when building the 64-bit kernel, but will be used by the x32 ABI in
    the near future.

    This also removes some gratuitious differences between i386, x86-64
    and ia32; in particular, now all system call tables are generated with
    the same mechanism.

    Cc: H. J. Lu
    Cc: Sam Ravnborg
    Cc: Michal Marek
    Signed-off-by: H. Peter Anvin

    H. Peter Anvin
     

15 Aug, 2010

1 commit

01 Mar, 2010

1 commit

08 Nov, 2009

1 commit

  • 24f1e32c6   hw-breakpoints: Rewrite the hw-breakpoints layer on top of perf events ... Browse Code »

    This patch rebase the implementation of the breakpoints API on top of
    perf events instances.

    Each breakpoints are now perf events that handle the
    register scheduling, thread/cpu attachment, etc..

    The new layering is now made as follows:

    ptrace kgdb ftrace perf syscall
    \ | / /
    \ | / /
    /
    Core breakpoint API /
    /
    | /
    | /

    Breakpoints perf events

    |
    |

    Breakpoints PMU ---- Debug Register constraints handling
    (Part of core breakpoint API)
    |
    |

    Hardware debug registers

    Reasons of this rewrite:

    - Use the centralized/optimized pmu registers scheduling,
    implying an easier arch integration
    - More powerful register handling: perf attributes (pinned/flexible
    events, exclusive/non-exclusive, tunable period, etc...)

    Impact:

    - New perf ABI: the hardware breakpoints counters
    - Ptrace breakpoints setting remains tricky and still needs some per
    thread breakpoints references.

    Todo (in the order):

    - Support breakpoints perf counter events for perf tools (ie: implement
    perf_bpcounter_event())
    - Support from perf tools

    Changes in v2:

    - Follow the perf "event " rename
    - The ptrace regression have been fixed (ptrace breakpoint perf events
    weren't released when a task ended)
    - Drop the struct hw_breakpoint and store generic fields in
    perf_event_attr.
    - Separate core and arch specific headers, drop
    asm-generic/hw_breakpoint.h and create linux/hw_breakpoint.h
    - Use new generic len/type for breakpoint
    - Handle off case: when breakpoints api is not supported by an arch

    Changes in v3:

    - Fix broken CONFIG_KVM, we need to propagate the breakpoint api
    changes to kvm when we exit the guest and restore the bp registers
    to the host.

    Changes in v4:

    - Drop the hw_breakpoint_restore() stub as it is only used by KVM
    - EXPORT_SYMBOL_GPL hw_breakpoint_restore() as KVM can be built as a
    module
    - Restore the breakpoints unconditionally on kvm guest exit:
    TIF_DEBUG_THREAD doesn't anymore cover every cases of running
    breakpoints and vcpu->arch.switch_db_regs might not always be
    set when the guest used debug registers.
    (Waiting for a reliable optimization)

    Changes in v5:

    - Split-up the asm-generic/hw-breakpoint.h moving to
    linux/hw_breakpoint.h into a separate patch
    - Optimize the breakpoints restoring while switching from kvm guest
    to host. We only want to restore the state if we have active
    breakpoints to the host, otherwise we don't care about messed-up
    address registers.
    - Add asm/hw_breakpoint.h to Kbuild
    - Fix bad breakpoint type in trace_selftest.c

    Changes in v6:

    - Fix wrong header inclusion in trace.h (triggered a build
    error with CONFIG_FTRACE_SELFTEST

    Signed-off-by: Frederic Weisbecker
    Cc: Prasad
    Cc: Alan Stern
    Cc: Peter Zijlstra
    Cc: Arnaldo Carvalho de Melo
    Cc: Steven Rostedt
    Cc: Ingo Molnar
    Cc: Jan Kiszka
    Cc: Jiri Slaby
    Cc: Li Zefan
    Cc: Avi Kivity
    Cc: Paul Mackerras
    Cc: Mike Galbraith
    Cc: Masami Hiramatsu
    Cc: Paul Mundt

    Frederic Weisbecker
     

15 Jan, 2009

1 commit

07 Jan, 2009

1 commit

23 Oct, 2008

1 commit