trace-seq/seq-buf/x86/printk: Print all stacks from NMI safely

Version 5!

Full diff between v4 and v5 will be replied to this email.

Here's the summary of the differences since version 4:

. Various clean ups

. Added trace_seq_used() to be used instead of s->seq.len

. Used seq_buf_used() instead of s->len

. Fixed output of ftrace_raw_output_prep() as well as caller code

. Fixed up tracing_fill_pipe_page() The logic was a bit whacky
and this was needed when introducing trace_seq_used()

. Rebased on latest ftrace/core code

. Fixed uprobe to be like probe code in print_uprobe_event()

. Introduced new seq_buf_can_fit() to remove the likelyhood of
screwing up the s->len + * < s->size code. Now it's just seq_buf_can_fit(s, len) which will tell us if the len can still fit in the buffer.

Enjoy,

-- Steve

Steven Rostedt (Red Hat) (26):
tracing: Fix trace_seq_bitmask() to start at current position
tracing: Add trace_seq_has_overflowed() and trace_handle_return() blktrace/tracing: Use trace_seq_has_overflowed() helper function
ring-buffer: Remove check of trace_seq_{puts,printf}() return values
tracing: Have branch tracer use trace_handle_return() helper function
tracing: Have function_graph use trace_seq_has_overflowed() kprobes/tracing: Use trace_seq_has_overflowed() for overflow checks
tracing: Do not check return values of trace_seq_p*() for mmio tracer tracing/probes: Do not use return value of trace_seq_printf() tracing/uprobes: Do not use return values of trace_seq_printf()
tracing: Do not use return values of trace_seq_printf() in syscall tracing
tracing: Remove return values of most trace_seq_*() functions
tracing: Fix return value of ftrace_raw_output_prep()
tracing: Create seq_buf layer in trace_seq
tracing: Convert seq_buf_path() to be like seq_path()
tracing: Convert seq_buf fields to be like seq_file fields
tracing: Add a seq_buf_clear() helper and clear len and readpos in init
seq_buf: Create seq_buf_used() to find out how much was written
tracing: Use trace_seq_used() and seq_buf_used() instead of len
seq_buf: Add seq_buf_can_fit() helper function
tracing: Have seq_buf use full buffer
tracing: Add seq_buf_get_buf() and seq_buf_commit() helper functions
seq-buf: Make seq_buf_bprintf() conditional on CONFIG_BINARY_PRINTF
seq_buf: Move the seq_buf code to lib/
printk: Add per_cpu printk func to allow printk to be diverted x86/nmi: Perform a safe NMI stack trace on all CPUs

----

 arch/x86/kernel/apic/hw_nmi.c        |  91 +++++++-
 include/linux/ftrace_event.h         |  11 +
 include/linux/percpu.h               |   3 +
 include/linux/printk.h               |   2 +
 include/linux/seq_buf.h              | 136 ++++++++++++
 include/linux/trace_seq.h            |  77 ++++---
 include/trace/ftrace.h               |   8 +-
 kernel/printk/printk.c               |  38 +++-
 kernel/trace/blktrace.c              | 148 ++++++-------
 kernel/trace/ring_buffer.c           |  75 +++----
 kernel/trace/trace.c                 | 126 ++++++-----
 kernel/trace/trace.h                 |   3 +-
 kernel/trace/trace_branch.c          |  15 +-
 kernel/trace/trace_events.c          |   9 +-
 kernel/trace/trace_functions_graph.c | 393 +++++++++++----------------------
 kernel/trace/trace_kprobe.c          |  42 ++--
 kernel/trace/trace_mmiotrace.c       |  52 ++---
 kernel/trace/trace_output.c          | 417 ++++++++++++++---------------------
 kernel/trace/trace_output.h          |  16 +-
 kernel/trace/trace_probe.c           |  10 +-
 kernel/trace/trace_seq.c             | 253 +++++++++------------
 kernel/trace/trace_syscalls.c        |  43 ++--
 kernel/trace/trace_uprobe.c          |  23 +-
 lib/Makefile                         |   2 +-
 lib/seq_buf.c                        | 351 +++++++++++++++++++++++++++++
 25 files changed, 1323 insertions(+), 1021 deletions(-)