linux-kernel - [RFC PATCH v1 0/4] Implement inline static calls on PPC32

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Date:   Wed, 25 May 2022 17:58:13 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, peterz@...radead.org,
        aik@...abs.ru, sv@...ux.ibm.com, rostedt@...dmis.org,
        jpoimboe@...hat.com, naveen.n.rao@...ux.vnet.ibm.com,
        mbenes@...e.cz
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v1 0/4] Implement inline static calls on PPC32

This is first draft for implementing inline static calls on PPC32.

This series applies on top of the series v2 "objtool: Enable and implement --mcount option on powerpc"

For the time being only the case where functions are within 'bl' reach
is supported. Otherwise panic() is invoked.

For the other case, we'll need to use the trampoline we have at startup
before initialising inline static calls. But it seems that at the time
being once inline static calls are initialised we don't know anymore
where the trampoline was.
We'd need to keep the information somewhere (is the static_call_key ?)
We may also need to keep the information for when the trampoline itself
is out of 'bl' reach, in that case there is a trampoline setup by the
compiler and we'll need to remind the location of that trampoline. Guess
it should get saved somewhere when we initialise inline static calls ?

Christophe Leroy (4):
  Revert "objtool: Enable objtool to run only on files with ftrace
    enabled"
  objtool: Add R_REL32 macro
  static_call: Call static_call_init() from start_kernel()
  powerpc/static_call: Implement inline static calls

 arch/powerpc/Kconfig                          |  1 +
 arch/powerpc/include/asm/static_call.h        |  2 +
 arch/powerpc/kernel/static_call.c             | 41 ++++++++++++-------
 init/main.c                                   |  1 +
 scripts/Makefile.build                        |  4 +-
 tools/objtool/arch/powerpc/include/arch/elf.h |  1 +
 tools/objtool/arch/x86/include/arch/elf.h     |  1 +
 tools/objtool/check.c                         | 10 ++---
 tools/objtool/orc_gen.c                       |  2 +-
 9 files changed, 41 insertions(+), 22 deletions(-)

-- 
2.35.3