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livepatch: Remove klp_check_compiler_support()

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The only purpose of klp_check_compiler_support() is to make sure that we
are not using ftrace on x86 via mcount (because that's executed only after
prologue has already happened, and that's too late for livepatching
purposes).

Now that mcount is not supported by ftrace any more, there is no need for
klp_check_compiler_support() either.

Link: http://lkml.kernel.org/r/nycvar.YFH.7.76.1905102346100.17054@cbobk.fhfr.pm

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Jiri Kosina 2019-05-10 23:47:50 +02:00 committed by Steven Rostedt (VMware)
parent 562e14f722
commit 56e33afd77
4 changed files with 0 additions and 23 deletions
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5
arch/powerpc/include/asm/livepatch.h
View File

@ -24,11 +24,6 @@
#include <linux/sched/task_stack.h>
#ifdef CONFIG_LIVEPATCH
static inline int klp_check_compiler_support(void)
{
return 0;
}
static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{
regs->nip = ip;

5
arch/s390/include/asm/livepatch.h
View File

@ -13,11 +13,6 @@
#include <asm/ptrace.h>
static inline int klp_check_compiler_support(void)
{
return 0;
}
static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{
regs->psw.addr = ip;

5
arch/x86/include/asm/livepatch.h
View File

@ -24,11 +24,6 @@
#include <asm/setup.h>
#include <linux/ftrace.h>
static inline int klp_check_compiler_support(void)
{
return 0;
}
static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{
regs->ip = ip;

8
kernel/livepatch/core.c
View File

@ -1220,14 +1220,6 @@ void klp_module_going(struct module *mod)
static int __init klp_init(void)
{
int ret;
ret = klp_check_compiler_support();
if (ret) {
pr_info("Your compiler is too old; turning off.\n");
return -EINVAL;
}
klp_root_kobj = kobject_create_and_add("livepatch", kernel_kobj);
if (!klp_root_kobj)
return -ENOMEM;