Commit 56e33afd authored by Jiri Kosina's avatar Jiri Kosina Committed by Steven Rostedt (VMware)

livepatch: Remove klp_check_compiler_support()

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.pmReported-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 562e14f7
...@@ -24,11 +24,6 @@ ...@@ -24,11 +24,6 @@
#include <linux/sched/task_stack.h> #include <linux/sched/task_stack.h>
#ifdef CONFIG_LIVEPATCH #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) static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{ {
regs->nip = ip; regs->nip = ip;
......
...@@ -13,11 +13,6 @@ ...@@ -13,11 +13,6 @@
#include <asm/ptrace.h> #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) static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{ {
regs->psw.addr = ip; regs->psw.addr = ip;
......
...@@ -24,11 +24,6 @@ ...@@ -24,11 +24,6 @@
#include <asm/setup.h> #include <asm/setup.h>
#include <linux/ftrace.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) static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{ {
regs->ip = ip; regs->ip = ip;
......
...@@ -1220,14 +1220,6 @@ void klp_module_going(struct module *mod) ...@@ -1220,14 +1220,6 @@ void klp_module_going(struct module *mod)
static int __init klp_init(void) 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); klp_root_kobj = kobject_create_and_add("livepatch", kernel_kobj);
if (!klp_root_kobj) if (!klp_root_kobj)
return -ENOMEM; return -ENOMEM;
......
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