[RFC PATCH v2 0/5] powerpc/ftrace: Move ftrace sequence out of line

[Naveen N Rao <naveen@kernel.org>]

This is v2 of the series posted here:
http://lkml.kernel.org/r/cover.1702045299.git.naveen@kernel.org

Since v2, the primary change is that the entire ftrace sequence is moved 
out of line and this is now restricted to 64-bit powerpc by default.  
Patch 5 has the details.

I have dropped patches to enable DYNAMIC_FTRACE_WITH_CALL_OPS and ftrace 
direct support so that this approach can be finalized.

This series depends on Benjamin Gray's series adding support for 
patch_ulong():
http://lkml.kernel.org/r/20240515024445.236364-1-bgray@linux.ibm.com


Appreciate feedback on the approach.


Thanks,
Naveen



Naveen N Rao (5):
  powerpc/kprobes: Use ftrace to determine if a probe is at function
    entry
  powerpc/ftrace: Remove pointer to struct module from dyn_arch_ftrace
  powerpc/ftrace: Unify 32-bit and 64-bit ftrace entry code
  kbuild: Add generic hook for architectures to use before the final
    vmlinux link
  powerpc64/ftrace: Move ftrace sequence out of line

 arch/Kconfig                             |   3 +
 arch/powerpc/Kconfig                     |   4 +
 arch/powerpc/Makefile                    |   4 +
 arch/powerpc/include/asm/ftrace.h        |  11 +-
 arch/powerpc/include/asm/module.h        |   5 +
 arch/powerpc/kernel/asm-offsets.c        |   4 +
 arch/powerpc/kernel/kprobes.c            |  18 +--
 arch/powerpc/kernel/module_64.c          |  67 +++++++-
 arch/powerpc/kernel/trace/ftrace.c       | 196 ++++++++++++++++++++---
 arch/powerpc/kernel/trace/ftrace_64_pg.c |  73 ++++-----
 arch/powerpc/kernel/trace/ftrace_entry.S |  75 ++++++---
 arch/powerpc/kernel/vmlinux.lds.S        |   3 +-
 arch/powerpc/tools/vmlinux_o.sh          |  47 ++++++
 scripts/link-vmlinux.sh                  |  18 ++-
 14 files changed, 419 insertions(+), 109 deletions(-)
 create mode 100755 arch/powerpc/tools/vmlinux_o.sh


base-commit: 2c644f2847c188b4fa545e602e4a1d4db55e8c8d
prerequisite-patch-id: a1d50e589288239d5a8b1c1f354cd4737057c9d3
prerequisite-patch-id: da4142d56880861bd0ad7ad7087c9e2670a2ee54
prerequisite-patch-id: 609d292e054b2396b603890522a940fa0bdfb6d8
prerequisite-patch-id: 6f7213fb77b1260defbf43be0e47bff9c80054cc
prerequisite-patch-id: ad3b71bf071ae4ba1bee5b087e61a2055772a74f
-- 
2.45.2