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>
diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c
index 0f61a73..e83cc99 100644
--- a/arch/tile/mm/fault.c
+++ b/arch/tile/mm/fault.c
@@ -35,6 +35,7 @@
#include <linux/syscalls.h>
#include <linux/uaccess.h>
#include <linux/kdebug.h>
+#include <linux/context_tracking.h>
#include <asm/pgalloc.h>
#include <asm/sections.h>
@@ -702,6 +703,7 @@
unsigned long address, unsigned long write)
{
int is_page_fault;
+ enum ctx_state prev_state = exception_enter();
#ifdef CONFIG_KPROBES
/*
@@ -711,7 +713,7 @@
*/
if (notify_die(DIE_PAGE_FAULT, "page fault", regs, -1,
regs->faultnum, SIGSEGV) == NOTIFY_STOP)
- return;
+ goto done;
#endif
#ifdef __tilegx__
@@ -750,7 +752,6 @@
current->comm, current->pid, pc, address);
show_regs(regs);
do_group_exit(SIGKILL);
- return;
}
}
#else
@@ -834,12 +835,15 @@
async->is_fault = is_page_fault;
async->is_write = write;
async->address = address;
- return;
+ goto done;
}
}
#endif
handle_page_fault(regs, fault_num, is_page_fault, address, write);
+
+done:
+ exception_exit(prev_state);
}