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livepatch: Remove klp_arch_set_pc() and asm/livepatch.h 

All three versions of klp_arch_set_pc() do exactly the same: they
call ftrace_instruction_pointer_set().

Call ftrace_instruction_pointer_set() directly and remove
klp_arch_set_pc().

As klp_arch_set_pc() was the only thing remaining in asm/livepatch.h
on x86 and s390, remove asm/livepatch.h

livepatch.h remains on powerpc but its content is exclusively used
by powerpc specific code.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Petr Mladek <pmladek@suse.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Christophe Leroy 2022-03-28 08:26:48 +02:00 committed by Petr Mladek
parent d111c9f034
commit 5d7c854593
8 changed files with 3 additions and 58 deletions
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2
MAINTAINERS
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@ -11338,8 +11338,6 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching.g
F: Documentation/ABI/testing/sysfs-kernel-livepatch
F: Documentation/livepatch/
F: arch/powerpc/include/asm/livepatch.h
F: arch/s390/include/asm/livepatch.h
F: arch/x86/include/asm/livepatch.h
F: include/linux/livepatch.h
F: kernel/livepatch/
F: lib/livepatch/

10
arch/powerpc/include/asm/livepatch.h
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@ -7,17 +7,9 @@
#ifndef _ASM_POWERPC_LIVEPATCH_H
#define _ASM_POWERPC_LIVEPATCH_H
#include <linux/module.h>
#include <linux/ftrace.h>
#include <linux/sched.h>
#include <linux/sched/task_stack.h>
#ifdef CONFIG_LIVEPATCH
static inline void klp_arch_set_pc(struct ftrace_regs *fregs, unsigned long ip)
{
ftrace_instruction_pointer_set(fregs, ip);
}
#endif /* CONFIG_LIVEPATCH */
#ifdef CONFIG_LIVEPATCH_64
static inline void klp_init_thread_info(struct task_struct *p)
{

1
arch/powerpc/kernel/irq.c
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@ -63,7 +63,6 @@
#include <asm/machdep.h>
#include <asm/udbg.h>
#include <asm/smp.h>
#include <asm/livepatch.h>
#include <asm/hw_irq.h>
#include <asm/softirq_stack.h>

2
arch/powerpc/kernel/setup_64.c
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@ -59,7 +59,7 @@
#include <asm/udbg.h>
#include <asm/kexec.h>
#include <asm/code-patching.h>
#include <asm/livepatch.h>
#include <asm/ftrace.h>
#include <asm/opal.h>
#include <asm/cputhreads.h>
#include <asm/hw_irq.h>

22
arch/s390/include/asm/livepatch.h
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@ -1,22 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* livepatch.h - s390-specific Kernel Live Patching Core
*
* Copyright (c) 2013-2015 SUSE
* Authors: Jiri Kosina
* Vojtech Pavlik
* Jiri Slaby
*/
#ifndef ASM_LIVEPATCH_H
#define ASM_LIVEPATCH_H
#include <linux/ftrace.h>
#include <asm/ptrace.h>
static inline void klp_arch_set_pc(struct ftrace_regs *fregs, unsigned long ip)
{
ftrace_instruction_pointer_set(fregs, ip);
}
#endif

20
arch/x86/include/asm/livepatch.h
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@ -1,20 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* livepatch.h - x86-specific Kernel Live Patching Core
*
* Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
* Copyright (C) 2014 SUSE
*/
#ifndef _ASM_X86_LIVEPATCH_H
#define _ASM_X86_LIVEPATCH_H
#include <asm/setup.h>
#include <linux/ftrace.h>
static inline void klp_arch_set_pc(struct ftrace_regs *fregs, unsigned long ip)
{
ftrace_instruction_pointer_set(fregs, ip);
}
#endif /* _ASM_X86_LIVEPATCH_H */

2
include/linux/livepatch.h
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@ -16,8 +16,6 @@
#if IS_ENABLED(CONFIG_LIVEPATCH)
#include <asm/livepatch.h>
/* task patch states */
#define KLP_UNDEFINED -1
#define KLP_UNPATCHED 0

2
kernel/livepatch/patch.c
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@ -118,7 +118,7 @@ static void notrace klp_ftrace_handler(unsigned long ip,
if (func->nop)
goto unlock;
klp_arch_set_pc(fregs, (unsigned long)func->new_func);
ftrace_instruction_pointer_set(fregs, (unsigned long)func->new_func);
unlock:
ftrace_test_recursion_unlock(bit);