MIPS: Implement HAVE_CONTEXT_TRACKING.
This enables support for CONFIG_NO_HZ_FULL.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index ade9973..87ddac9 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1,6 +1,7 @@
config MIPS
bool
default y
+ select HAVE_CONTEXT_TRACKING
select HAVE_GENERIC_DMA_COHERENT
select HAVE_IDE
select HAVE_OPROFILE
diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/asm/thread_info.h
index cdea4f6..61215a3 100644
--- a/arch/mips/include/asm/thread_info.h
+++ b/arch/mips/include/asm/thread_info.h
@@ -109,6 +109,7 @@
#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
+#define TIF_NOHZ 19 /* in adaptive nohz mode */
#define TIF_FIXADE 20 /* Fix address errors in software */
#define TIF_LOGADE 21 /* Log address errors to syslog */
#define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */
@@ -124,6 +125,7 @@
#define _TIF_SECCOMP (1<<TIF_SECCOMP)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
#define _TIF_USEDFPU (1<<TIF_USEDFPU)
+#define _TIF_NOHZ (1<<TIF_NOHZ)
#define _TIF_FIXADE (1<<TIF_FIXADE)
#define _TIF_LOGADE (1<<TIF_LOGADE)
#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
@@ -131,16 +133,19 @@
#define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
-#define _TIF_WORK_SYSCALL_ENTRY (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT)
+#define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
+ _TIF_SYSCALL_AUDIT)
/* work to do in syscall_trace_leave() */
-#define _TIF_WORK_SYSCALL_EXIT (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT)
+#define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
+ _TIF_SYSCALL_AUDIT)
/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK \
(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
/* work to do on any return to u-space */
-#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | _TIF_WORK_SYSCALL_EXIT)
+#define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \
+ _TIF_WORK_SYSCALL_EXIT)
#endif /* __KERNEL__ */
diff --git a/arch/mips/kernel/cpu-bugs64.c b/arch/mips/kernel/cpu-bugs64.c
index de3c25f..0c61df2 100644
--- a/arch/mips/kernel/cpu-bugs64.c
+++ b/arch/mips/kernel/cpu-bugs64.c
@@ -6,6 +6,7 @@
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
+#include <linux/context_tracking.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/ptrace.h>
@@ -171,8 +172,12 @@
asmlinkage void __init do_daddi_ov(struct pt_regs *regs)
{
+ enum ctx_state prev_state;
+
+ prev_state = exception_enter();
daddi_ov = 1;
regs->cp0_epc += 4;
+ exception_exit(prev_state);
}
static inline void check_daddi(void)
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 9c6299c..8ae1ebe 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -15,6 +15,7 @@
* binaries.
*/
#include <linux/compiler.h>
+#include <linux/context_tracking.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
@@ -534,6 +535,8 @@
*/
asmlinkage void syscall_trace_enter(struct pt_regs *regs)
{
+ user_exit();
+
/* do the secure computing check first */
secure_computing_strict(regs->regs[2]);
@@ -570,6 +573,13 @@
*/
asmlinkage void syscall_trace_leave(struct pt_regs *regs)
{
+ /*
+ * We may come here right after calling schedule_user()
+ * or do_notify_resume(), in which case we can be in RCU
+ * user mode.
+ */
+ user_exit();
+
audit_syscall_exit(regs);
if (!(current->ptrace & PT_PTRACED))
@@ -592,4 +602,6 @@
send_sig(current->exit_code, current, 1);
current->exit_code = 0;
}
+
+ user_enter();
}
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index fd3ef2c..2f285ab 100644
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -8,6 +8,7 @@
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
#include <linux/cache.h>
+#include <linux/context_tracking.h>
#include <linux/irqflags.h>
#include <linux/sched.h>
#include <linux/mm.h>
@@ -573,6 +574,8 @@
{
local_irq_enable();
+ user_exit();
+
/* deal with pending signal delivery */
if (thread_info_flags & _TIF_SIGPENDING)
do_signal(regs);
@@ -581,6 +584,8 @@
clear_thread_flag(TIF_NOTIFY_RESUME);
tracehook_notify_resume(regs);
}
+
+ user_enter();
}
#ifdef CONFIG_SMP
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index a75ae40..beba1e6 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -13,6 +13,7 @@
*/
#include <linux/bug.h>
#include <linux/compiler.h>
+#include <linux/context_tracking.h>
#include <linux/kexec.h>
#include <linux/init.h>
#include <linux/kernel.h>
@@ -423,7 +424,9 @@
const struct exception_table_entry *fixup = NULL;
int data = regs->cp0_cause & 4;
int action = MIPS_BE_FATAL;
+ enum ctx_state prev_state;
+ prev_state = exception_enter();
/* XXX For now. Fixme, this searches the wrong table ... */
if (data && !user_mode(regs))
fixup = search_dbe_tables(exception_epc(regs));
@@ -436,11 +439,11 @@
switch (action) {
case MIPS_BE_DISCARD:
- return;
+ goto out;
case MIPS_BE_FIXUP:
if (fixup) {
regs->cp0_epc = fixup->nextinsn;
- return;
+ goto out;
}
break;
default:
@@ -455,10 +458,13 @@
field, regs->cp0_epc, field, regs->regs[31]);
if (notify_die(DIE_OOPS, "bus error", regs, 0, regs_to_trapnr(regs), SIGBUS)
== NOTIFY_STOP)
- return;
+ goto out;
die_if_kernel("Oops", regs);
force_sig(SIGBUS, current);
+
+out:
+ exception_exit(prev_state);
}
/*
@@ -673,8 +679,10 @@
asmlinkage void do_ov(struct pt_regs *regs)
{
+ enum ctx_state prev_state;
siginfo_t info;
+ prev_state = exception_enter();
die_if_kernel("Integer overflow", regs);
info.si_code = FPE_INTOVF;
@@ -682,6 +690,7 @@
info.si_errno = 0;
info.si_addr = (void __user *) regs->cp0_epc;
force_sig_info(SIGFPE, &info, current);
+ exception_exit(prev_state);
}
int process_fpemu_return(int sig, void __user *fault_addr)
@@ -713,11 +722,13 @@
*/
asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
{
+ enum ctx_state prev_state;
siginfo_t info = {0};
+ prev_state = exception_enter();
if (notify_die(DIE_FP, "FP exception", regs, 0, regs_to_trapnr(regs), SIGFPE)
== NOTIFY_STOP)
- return;
+ goto out;
die_if_kernel("FP exception in kernel code", regs);
if (fcr31 & FPU_CSR_UNI_X) {
@@ -753,7 +764,7 @@
/* If something went wrong, signal */
process_fpemu_return(sig, fault_addr);
- return;
+ goto out;
} else if (fcr31 & FPU_CSR_INV_X)
info.si_code = FPE_FLTINV;
else if (fcr31 & FPU_CSR_DIV_X)
@@ -770,6 +781,9 @@
info.si_errno = 0;
info.si_addr = (void __user *) regs->cp0_epc;
force_sig_info(SIGFPE, &info, current);
+
+out:
+ exception_exit(prev_state);
}
static void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
@@ -835,9 +849,11 @@
asmlinkage void do_bp(struct pt_regs *regs)
{
unsigned int opcode, bcode;
+ enum ctx_state prev_state;
unsigned long epc;
u16 instr[2];
+ prev_state = exception_enter();
if (get_isa16_mode(regs->cp0_epc)) {
/* Calculate EPC. */
epc = exception_epc(regs);
@@ -852,7 +868,7 @@
goto out_sigsegv;
bcode = (instr[0] >> 6) & 0x3f;
do_trap_or_bp(regs, bcode, "Break");
- return;
+ goto out;
}
} else {
if (__get_user(opcode, (unsigned int __user *) exception_epc(regs)))
@@ -876,12 +892,12 @@
switch (bcode) {
case BRK_KPROBE_BP:
if (notify_die(DIE_BREAK, "debug", regs, bcode, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP)
- return;
+ goto out;
else
break;
case BRK_KPROBE_SSTEPBP:
if (notify_die(DIE_SSTEPBP, "single_step", regs, bcode, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP)
- return;
+ goto out;
else
break;
default:
@@ -889,18 +905,24 @@
}
do_trap_or_bp(regs, bcode, "Break");
+
+out:
+ exception_exit(prev_state);
return;
out_sigsegv:
force_sig(SIGSEGV, current);
+ goto out;
}
asmlinkage void do_tr(struct pt_regs *regs)
{
u32 opcode, tcode = 0;
+ enum ctx_state prev_state;
u16 instr[2];
unsigned long epc = msk_isa16_mode(exception_epc(regs));
+ prev_state = exception_enter();
if (get_isa16_mode(regs->cp0_epc)) {
if (__get_user(instr[0], (u16 __user *)(epc + 0)) ||
__get_user(instr[1], (u16 __user *)(epc + 2)))
@@ -918,10 +940,14 @@
}
do_trap_or_bp(regs, tcode, "Trap");
+
+out:
+ exception_exit(prev_state);
return;
out_sigsegv:
force_sig(SIGSEGV, current);
+ goto out;
}
asmlinkage void do_ri(struct pt_regs *regs)
@@ -929,17 +955,19 @@
unsigned int __user *epc = (unsigned int __user *)exception_epc(regs);
unsigned long old_epc = regs->cp0_epc;
unsigned long old31 = regs->regs[31];
+ enum ctx_state prev_state;
unsigned int opcode = 0;
int status = -1;
+ prev_state = exception_enter();
if (notify_die(DIE_RI, "RI Fault", regs, 0, regs_to_trapnr(regs), SIGILL)
== NOTIFY_STOP)
- return;
+ goto out;
die_if_kernel("Reserved instruction in kernel code", regs);
if (unlikely(compute_return_epc(regs) < 0))
- return;
+ goto out;
if (get_isa16_mode(regs->cp0_epc)) {
unsigned short mmop[2] = { 0 };
@@ -974,6 +1002,9 @@
regs->regs[31] = old31;
force_sig(status, current);
}
+
+out:
+ exception_exit(prev_state);
}
/*
@@ -1040,6 +1071,7 @@
asmlinkage void do_cpu(struct pt_regs *regs)
{
+ enum ctx_state prev_state;
unsigned int __user *epc;
unsigned long old_epc, old31;
unsigned int opcode;
@@ -1047,6 +1079,7 @@
int status;
unsigned long __maybe_unused flags;
+ prev_state = exception_enter();
die_if_kernel("do_cpu invoked from kernel context!", regs);
cpid = (regs->cp0_cause >> CAUSEB_CE) & 3;
@@ -1060,7 +1093,7 @@
status = -1;
if (unlikely(compute_return_epc(regs) < 0))
- return;
+ goto out;
if (get_isa16_mode(regs->cp0_epc)) {
unsigned short mmop[2] = { 0 };
@@ -1093,7 +1126,7 @@
force_sig(status, current);
}
- return;
+ goto out;
case 3:
/*
@@ -1131,19 +1164,26 @@
mt_ase_fp_affinity();
}
- return;
+ goto out;
case 2:
raw_notifier_call_chain(&cu2_chain, CU2_EXCEPTION, regs);
- return;
+ goto out;
}
force_sig(SIGILL, current);
+
+out:
+ exception_exit(prev_state);
}
asmlinkage void do_mdmx(struct pt_regs *regs)
{
+ enum ctx_state prev_state;
+
+ prev_state = exception_enter();
force_sig(SIGILL, current);
+ exception_exit(prev_state);
}
/*
@@ -1151,8 +1191,10 @@
*/
asmlinkage void do_watch(struct pt_regs *regs)
{
+ enum ctx_state prev_state;
u32 cause;
+ prev_state = exception_enter();
/*
* Clear WP (bit 22) bit of cause register so we don't loop
* forever.
@@ -1174,13 +1216,16 @@
mips_clear_watch_registers();
local_irq_enable();
}
+ exception_exit(prev_state);
}
asmlinkage void do_mcheck(struct pt_regs *regs)
{
const int field = 2 * sizeof(unsigned long);
int multi_match = regs->cp0_status & ST0_TS;
+ enum ctx_state prev_state;
+ prev_state = exception_enter();
show_regs(regs);
if (multi_match) {
@@ -1202,6 +1247,7 @@
panic("Caught Machine Check exception - %scaused by multiple "
"matching entries in the TLB.",
(multi_match) ? "" : "not ");
+ exception_exit(prev_state);
}
asmlinkage void do_mt(struct pt_regs *regs)
diff --git a/arch/mips/kernel/unaligned.c b/arch/mips/kernel/unaligned.c
index 203d885..3eaa02a 100644
--- a/arch/mips/kernel/unaligned.c
+++ b/arch/mips/kernel/unaligned.c
@@ -72,6 +72,7 @@
* A store crossing a page boundary might be executed only partially.
* Undo the partial store in this case.
*/
+#include <linux/context_tracking.h>
#include <linux/mm.h>
#include <linux/signal.h>
#include <linux/smp.h>
@@ -1550,9 +1551,11 @@
}
asmlinkage void do_ade(struct pt_regs *regs)
{
+ enum ctx_state prev_state;
unsigned int __user *pc;
mm_segment_t seg;
+ prev_state = exception_enter();
perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS,
1, regs, regs->cp0_badvaddr);
/*
@@ -1628,6 +1631,7 @@
/*
* XXX On return from the signal handler we should advance the epc
*/
+ exception_exit(prev_state);
}
#ifdef CONFIG_DEBUG_FS
diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index 0fead53..85df1cd 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -5,6 +5,7 @@
*
* Copyright (C) 1995 - 2000 by Ralf Baechle
*/
+#include <linux/context_tracking.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
@@ -32,8 +33,8 @@
* and the problem, and then passes it off to one of the appropriate
* routines.
*/
-asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, unsigned long write,
- unsigned long address)
+static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
+ unsigned long address)
{
struct vm_area_struct * vma = NULL;
struct task_struct *tsk = current;
@@ -312,3 +313,13 @@
}
#endif
}
+
+asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
+ unsigned long write, unsigned long address)
+{
+ enum ctx_state prev_state;
+
+ prev_state = exception_enter();
+ __do_page_fault(regs, write, address);
+ exception_exit(prev_state);
+}