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From: Jason Baron on 16 Apr 2010 11:30
Hi,

Based on David Miller's suggestion this version re-works the architecture
interfaces for jump labels. I have also added a documentation file, and
re-freshed the patchset against the latest -tip tree.

The new architecture interface (quoting from the docs file), is as follows:

"
4) architecture interface

There are a few functions and macros which arches must implement in order to
take advantage of this optimization. As previously mentioned, if there is no
architecture support we simply fall back to a traditional, load, test, and
jump sequence.

* add "HAVE_ARCH_JUMP_LABEL" to arch/<arch>/Kconfig to indicate support

* #define JUMP_LABEL_NOP_SIZE, arch/x86/include/asm/jump_label.h

* #define "JUMP_LABEL(tag, label, cond)", arch/x86/include/asm/jump_label.h

* add: void arch_jump_label_transform(struct jump_entry *entry, enum jump_label_type type)
and
const u8 *arch_get_jump_label_nop(void)

see: arch/x86/kernel/jump_label.c

* finally add a definition for "struct jump_entry". This must be done in a
separate .h file, b/c the modpost.c code uses this definition to sort the
the jump label tabel in the vmlinux, so that it does not have to be sorted at
runtime. see: arch/x86/include/asm/jump_entry.h
"

David, I re-worked the sparc64 to match the updated interfaces. The code should
hopefully compile now, although I did not test the sparc bits.

thanks,

-Jason

David S. Miller (1):
sparc64: Add jump_label support

Jason Baron (9):
jump label: base patch
jump label: x86 support
jump label: tracepoint support
jump label: add module support
jump label: move ftrace_dyn_arch_init to common code
jump label: sort jump table at build-time
jump label: initialize workqueue tracepoints *before* they are
registered
jump label: jump_label_text_reserved() to reserve our jump points
jump label: add docs

Mathieu Desnoyers (1):
jump label: notifier atomic call chain notrace

Documentation/jump-label.txt | 140 +++++++++++
Makefile | 6 +-
arch/Kconfig | 3 +
arch/sparc/Kconfig | 1 +
arch/sparc/include/asm/jump_entry.h | 16 ++
arch/sparc/include/asm/jump_label.h | 21 ++
arch/sparc/kernel/Makefile | 2 +
arch/sparc/kernel/jump_label.c | 38 +++
arch/sparc/kernel/module.c | 6 +
arch/x86/Kconfig | 1 +
arch/x86/include/asm/alternative.h | 14 ++
arch/x86/include/asm/jump_entry.h | 28 +++
arch/x86/include/asm/jump_label.h | 23 ++
arch/x86/kernel/Makefile | 2 +-
arch/x86/kernel/alternative.c | 71 ++++++-
arch/x86/kernel/ftrace.c | 70 +------
arch/x86/kernel/jump_label.c | 47 ++++
arch/x86/kernel/kprobes.c | 3 +-
arch/x86/kernel/module.c | 3 +
arch/x86/kernel/ptrace.c | 1 +
arch/x86/kernel/setup.c | 3 +
include/asm-generic/vmlinux.lds.h | 22 ++-
include/linux/jump_label.h | 75 ++++++
include/linux/module.h | 5 +-
include/linux/tracepoint.h | 34 ++--
kernel/Makefile | 2 +-
kernel/jump_label.c | 431 +++++++++++++++++++++++++++++++++++
kernel/kprobes.c | 3 +-
kernel/module.c | 7 +
kernel/notifier.c | 6 +-
kernel/trace/ftrace.c | 13 +-
kernel/trace/trace_workqueue.c | 10 +-
kernel/tracepoint.c | 8 +
scripts/mod/Makefile | 1 +
scripts/mod/modpost.c | 71 ++++++-
scripts/mod/modpost.h | 2 +
36 files changed, 1073 insertions(+), 116 deletions(-)
create mode 100644 Documentation/jump-label.txt
create mode 100644 arch/sparc/include/asm/jump_entry.h
create mode 100644 arch/sparc/include/asm/jump_label.h
create mode 100644 arch/sparc/kernel/jump_label.c
create mode 100644 arch/x86/include/asm/jump_entry.h
create mode 100644 arch/x86/include/asm/jump_label.h
create mode 100644 arch/x86/kernel/jump_label.c
create mode 100644 include/linux/jump_label.h
create mode 100644 kernel/jump_label.c

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