The first two patches fix a kernel oops when function tracing is enabled
while using KVM and are v2 of the patches posted at:
https://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg130548.html
Patch 3 is a new patch that tightens how we detect _mcount() call sites
for -mprofile-kernel during module loading.
The last two patches implement support for ftrace_caller() to
conditionally save the register state. The existing ftrace_caller() is
renamed to ftrace_regs_caller() since we save the entire pt_regs today.
A new implementation of ftrace_caller() that saves the minimum register
state is provided. We switch between the two variants through
ftrace_modify_call(). The necessary support to call into the two
different variants from modules is also added.
- Naveen
Naveen N. Rao (5):
powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code
paths
powerpc64/ftrace: Disable ftrace during kvm guest entry/exit
powerpc64/module: Tighten detection of mcount call sites with
-mprofile-kernel
powerpc64/ftrace: Use the generic version of ftrace_replace_code()
powerpc64/ftrace: Implement support for ftrace_regs_caller()
arch/powerpc/include/asm/ftrace.h | 2 -
arch/powerpc/include/asm/module.h | 3 +
arch/powerpc/include/asm/paca.h | 1 +
arch/powerpc/kernel/asm-offsets.c | 1 +
arch/powerpc/kernel/module_64.c | 43 +++--
arch/powerpc/kernel/trace/ftrace.c | 210 ++++++++++++++++++++-----
arch/powerpc/kernel/trace/ftrace_64_mprofile.S | 85 +++++++++-
arch/powerpc/kernel/trace/ftrace_64_pg.S | 4 +
arch/powerpc/kvm/book3s_hv_rmhandlers.S | 8 +
9 files changed, 294 insertions(+), 63 deletions(-)
--
2.16.2
