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authorChris Metcalf <cmetcalf@ezchip.com>2015-03-23 21:23:58 +0300
committerChris Metcalf <cmetcalf@ezchip.com>2015-04-17 21:01:10 +0300
commit49e4e15619cd7cd9fc275d460fae2a95c1337fcc (patch)
tree700e24bb8f72a7662e7d4ae26d847e908d08de92 /arch/tile/kernel/traps.c
parentb340c656af6317e28b466996a72cca019d97b42d (diff)
downloadlinux-49e4e15619cd7cd9fc275d460fae2a95c1337fcc.tar.xz
tile: support CONTEXT_TRACKING and thus NOHZ_FULL
Add the TIF_NOHZ flag appropriately. Add call to user_exit() on entry to do_work_pending() and on entry to syscalls via do_syscall_trace_enter(), and also the top of do_syscall_trace_exit() just because it's done in x86. Add call to user_enter() at the bottom of do_work_pending() once we have no more work to do before returning to userspace. Wrap all the trap code in exception_enter() / exception_exit(). Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'arch/tile/kernel/traps.c')
-rw-r--r--arch/tile/kernel/traps.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/arch/tile/kernel/traps.c b/arch/tile/kernel/traps.c
index bf841ca517bb..312fc134c1cb 100644
--- a/arch/tile/kernel/traps.c
+++ b/arch/tile/kernel/traps.c
@@ -20,6 +20,7 @@
#include <linux/reboot.h>
#include <linux/uaccess.h>
#include <linux/ptrace.h>
+#include <linux/context_tracking.h>
#include <asm/stack.h>
#include <asm/traps.h>
#include <asm/setup.h>
@@ -253,6 +254,7 @@ static int do_bpt(struct pt_regs *regs)
void __kprobes do_trap(struct pt_regs *regs, int fault_num,
unsigned long reason)
{
+ enum ctx_state prev_state = exception_enter();
siginfo_t info = { 0 };
int signo, code;
unsigned long address = 0;
@@ -261,7 +263,7 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
/* Handle breakpoints, etc. */
if (is_kernel && fault_num == INT_ILL && do_bpt(regs))
- return;
+ goto done;
/* Re-enable interrupts, if they were previously enabled. */
if (!(regs->flags & PT_FLAGS_DISABLE_IRQ))
@@ -275,7 +277,7 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
const char *name;
char buf[100];
if (fixup_exception(regs)) /* ILL_TRANS or UNALIGN_DATA */
- return;
+ goto done;
if (fault_num >= 0 &&
fault_num < ARRAY_SIZE(int_name) &&
int_name[fault_num] != NULL)
@@ -294,7 +296,6 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
fault_num, name, regs->pc, buf);
show_regs(regs);
do_exit(SIGKILL); /* FIXME: implement i386 die() */
- return;
}
switch (fault_num) {
@@ -308,7 +309,6 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
pr_err("Unreadable instruction for INT_ILL: %#lx\n",
regs->pc);
do_exit(SIGKILL);
- return;
}
if (!special_ill(instr, &signo, &code)) {
signo = SIGILL;
@@ -319,7 +319,7 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
case INT_GPV:
#if CHIP_HAS_TILE_DMA()
if (retry_gpv(reason))
- return;
+ goto done;
#endif
/*FALLTHROUGH*/
case INT_UDN_ACCESS:
@@ -346,7 +346,7 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
if (!state ||
(void __user *)(regs->pc) != state->buffer) {
single_step_once(regs);
- return;
+ goto done;
}
}
#endif
@@ -380,7 +380,6 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
#endif
default:
panic("Unexpected do_trap interrupt number %d", fault_num);
- return;
}
info.si_signo = signo;
@@ -391,6 +390,9 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
if (signo != SIGTRAP)
trace_unhandled_signal("trap", regs, address, signo);
force_sig_info(signo, &info, current);
+
+done:
+ exception_exit(prev_state);
}
void kernel_double_fault(int dummy, ulong pc, ulong lr, ulong sp, ulong r52)