This patch moves the x86-specific prctl call implementations out
of core code and removes redundant boilerplate associated with
them.
No functional change.
Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: x86@xxxxxxxxxx
---
arch/x86/Kconfig | 1 +
arch/x86/include/asm/processor.h | 6 ------
arch/x86/kernel/Makefile | 1 +
arch/x86/kernel/sys.c | 26 ++++++++++++++++++++++++++
kernel/sys.c | 28 ----------------------------
5 files changed, 28 insertions(+), 34 deletions(-)
create mode 100644 arch/x86/kernel/sys.c
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c07f492..7bae36a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -176,6 +176,7 @@ config X86
select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
select HAVE_PERF_REGS
select HAVE_PERF_USER_STACK_DUMP
+ select HAVE_PRCTL_ARCH
select HAVE_RCU_TABLE_FREE
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RELIABLE_STACKTRACE if X86_64 && UNWINDER_FRAME_POINTER && STACK_VALIDATION
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 21a1149..0ecdda4 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -924,18 +924,12 @@ extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
#define KSTK_EIP(task) (task_pt_regs(task)->ip)
/* Get/set a process' ability to use the timestamp counter instruction */
-#define GET_TSC_CTL(adr) get_tsc_mode((adr))
-#define SET_TSC_CTL(val) set_tsc_mode((val))
-
extern int get_tsc_mode(unsigned long adr);
extern int set_tsc_mode(unsigned int val);
DECLARE_PER_CPU(u64, msr_misc_features_shadow);
/* Register/unregister a process' MPX related resource */
-#define MPX_ENABLE_MANAGEMENT() mpx_enable_management()
-#define MPX_DISABLE_MANAGEMENT() mpx_disable_management()
-
#ifdef CONFIG_X86_INTEL_MPX
extern int mpx_enable_management(void);
extern int mpx_disable_management(void);
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 02d6f5c..636e40d 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_MODIFY_LDT_SYSCALL) += ldt.o
obj-y += setup.o x86_init.o i8259.o irqinit.o jump_label.o
obj-$(CONFIG_IRQ_WORK) += irq_work.o
obj-y += probe_roms.o
+obj-y += sys.o
obj-$(CONFIG_X86_64) += sys_x86_64.o
obj-$(CONFIG_X86_ESPFIX64) += espfix_64.o
obj-$(CONFIG_SYSFS) += ksysfs.o
diff --git a/arch/x86/kernel/sys.c b/arch/x86/kernel/sys.c
new file mode 100644
index 0000000..3be4d16
--- /dev/null
+++ b/arch/x86/kernel/sys.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/errno.h>
+#include <linux/prctl.h>
+#include <asm/processor.h>
+
+int prctl_arch(int option, unsigned long arg2, unsigned long arg3,
+ unsigned long arg4, unsigned long arg5)
+{
+ switch (option) {
+ case PR_GET_TSC:
+ return get_tsc_mode(arg2);
+ case PR_SET_TSC:
+ return set_tsc_mode(arg2);
+ case PR_MPX_ENABLE_MANAGEMENT:
+ if (arg2 || arg3 || arg4 || arg5)
+ return -EINVAL;
+ return mpx_enable_management();
+ case PR_MPX_DISABLE_MANAGEMENT:
+ if (arg2 || arg3 || arg4 || arg5)
+ return -EINVAL;
+ return mpx_disable_management();
+ default:
+ return -EINVAL;
+ }
+}
diff --git a/kernel/sys.c b/kernel/sys.c
index 63228e7..994b5711 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -95,18 +95,6 @@
#ifndef SET_ENDIAN
# define SET_ENDIAN(a, b) (-EINVAL)
#endif
-#ifndef GET_TSC_CTL
-# define GET_TSC_CTL(a) (-EINVAL)
-#endif
-#ifndef SET_TSC_CTL
-# define SET_TSC_CTL(a) (-EINVAL)
-#endif
-#ifndef MPX_ENABLE_MANAGEMENT
-# define MPX_ENABLE_MANAGEMENT() (-EINVAL)
-#endif
-#ifndef MPX_DISABLE_MANAGEMENT
-# define MPX_DISABLE_MANAGEMENT() (-EINVAL)
-#endif
/*
* this is where the system-wide overflow UID and GID are defined, for
@@ -2314,12 +2302,6 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
case PR_SET_SECCOMP:
error = prctl_set_seccomp(arg2, (char __user *)arg3);
break;
- case PR_GET_TSC:
- error = GET_TSC_CTL(arg2);
- break;
- case PR_SET_TSC:
- error = SET_TSC_CTL(arg2);
- break;
case PR_TASK_PERF_EVENTS_DISABLE:
error = perf_event_task_disable();
break;
@@ -2416,16 +2398,6 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
clear_bit(MMF_DISABLE_THP, &me->mm->flags);
up_write(&me->mm->mmap_sem);
break;
- case PR_MPX_ENABLE_MANAGEMENT:
- if (arg2 || arg3 || arg4 || arg5)
- return -EINVAL;
- error = MPX_ENABLE_MANAGEMENT();
- break;
- case PR_MPX_DISABLE_MANAGEMENT:
- if (arg2 || arg3 || arg4 || arg5)
- return -EINVAL;
- error = MPX_DISABLE_MANAGEMENT();
- break;
default:
error = prctl_arch(option, arg2, arg3, arg4, arg5);
break;
--
2.1.4
