[PATCH v3 0/8] ftrace with regs + live patching for ppc64 LE (ABI v2)

From: Torsten Duwe
Date: Mon Oct 26 2015 - 13:49:37 EST

Hi all,

here is the current status of ftrace with regs, trace ops and live patching
for ppc64le. It seems I broke the ftrace graph caller and I spent most of
last week trying to fix it; Steven, maybe you could have a look? I startet
out with -mprofile-kernel and now found that the ordinary -pg is very
different. -mprofile-kernel only does the very bare minimal prologue
(set TOC, save LR) and then calls _mcount, which poses some problems.
I managed to get them resolved up to the point of the graph return ...

I tested intensively with the ftrace self tests, and, without the graph
caller, this set passes all of them on ppc64le. I tried not to break BE,
but may have missed an ifdef or two.

patch 2 (ftrace_modify_all_code default) is an independent prerequisite,
I would even call it a fix -- please consider applying it even if you
don't like the rest.

patch 5 has proven to be very useful during development; as mentioned earlier,
many of these functions may get called during a recoverable fault. The whole
recursion will probably terminate if all goes well, but I'd rather be
defensive here.

Torsten Duwe (8):
ppc64le FTRACE_WITH_REGS implementation
ppc use ftrace_modify_all_code default
ppc64 ftrace_with_regs configuration variables
ppc64 ftrace_with_regs: spare early boot and low level
ppc64 ftrace: disable profiling for some functions
ppc64 ftrace: disable profiling for some files
Implement kernel live patching for ppc64le (ABIv2)
Enable LIVEPATCH to be configured on ppc64le and add livepatch.o if it
is selected.

arch/powerpc/Kconfig | 7 ++
arch/powerpc/Makefile | 7 ++
arch/powerpc/include/asm/ftrace.h | 5 ++
arch/powerpc/include/asm/livepatch.h | 27 +++++++
arch/powerpc/kernel/Makefile | 13 +--
arch/powerpc/kernel/entry_64.S | 153 ++++++++++++++++++++++++++++++++++-
arch/powerpc/kernel/ftrace.c | 88 +++++++++++++++-----
arch/powerpc/kernel/livepatch.c | 20 +++++
arch/powerpc/kernel/module_64.c | 39 ++++++++-
arch/powerpc/kernel/process.c | 2 +-
arch/powerpc/lib/Makefile | 4 +-
arch/powerpc/mm/fault.c | 2 +-
arch/powerpc/mm/hash_utils_64.c | 18 ++---
arch/powerpc/mm/hugetlbpage-hash64.c | 2 +-
arch/powerpc/mm/hugetlbpage.c | 4 +-
arch/powerpc/mm/mem.c | 2 +-
arch/powerpc/mm/pgtable_64.c | 2 +-
arch/powerpc/mm/slb.c | 6 +-
arch/powerpc/mm/slice.c | 8 +-
kernel/trace/Kconfig | 5 ++
20 files changed, 359 insertions(+), 55 deletions(-)
create mode 100644 arch/powerpc/include/asm/livepatch.h
create mode 100644 arch/powerpc/kernel/livepatch.c


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/