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tile: support CONTEXT_TRACKING and thus NOHZ_FULL

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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>
This commit is contained in:
Chris Metcalf 2015-03-23 14:23:58 -04:00
parent b340c656af
commit 49e4e15619
8 changed files with 67 additions and 28 deletions
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12
arch/tile/kernel/process.c
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@ -27,6 +27,7 @@
#include <linux/kernel.h>
#include <linux/tracehook.h>
#include <linux/signal.h>
#include <linux/context_tracking.h>
#include <asm/stack.h>
#include <asm/switch_to.h>
#include <asm/homecache.h>
@ -474,6 +475,8 @@ int do_work_pending(struct pt_regs *regs, u32 thread_info_flags)
if (!user_mode(regs))
return 0;
user_exit();
/* Enable interrupts; they are disabled again on return to caller. */
local_irq_enable();
@ -496,11 +499,12 @@ int do_work_pending(struct pt_regs *regs, u32 thread_info_flags)
tracehook_notify_resume(regs);
return 1;
}
if (thread_info_flags & _TIF_SINGLESTEP) {
if (thread_info_flags & _TIF_SINGLESTEP)
single_step_once(regs);
return 0;
}
panic("work_pending: bad flags %#x\n", thread_info_flags);
user_enter();
return 0;
}
unsigned long get_wchan(struct task_struct *p)