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Core changes to support TASK_NOTIFY_SIGNAL

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Merge tag 'core-entry-notify-signal' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into tif-task_work.arch

Core changes to support TASK_NOTIFY_SIGNAL

* tag 'core-entry-notify-signal' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  task_work: Use TIF_NOTIFY_SIGNAL if available
  entry: Add support for TIF_NOTIFY_SIGNAL
  signal: Add task_sigpending() helper
This commit is contained in:
Jens Axboe 2020-11-09 07:19:32 -07:00
commit 29701d69b9
10 changed files with 118 additions and 30 deletions
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11
include/linux/entry-common.h
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@ -37,6 +37,10 @@
# define _TIF_UPROBE (0)
#endif
#ifndef _TIF_NOTIFY_SIGNAL
# define _TIF_NOTIFY_SIGNAL (0)
#endif
/*
* TIF flags handled in syscall_enter_from_user_mode()
*/
@ -69,7 +73,7 @@
#define EXIT_TO_USER_MODE_WORK \
(_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
_TIF_NEED_RESCHED | _TIF_PATCH_PENDING | \
_TIF_NEED_RESCHED | _TIF_PATCH_PENDING | _TIF_NOTIFY_SIGNAL | \
ARCH_EXIT_TO_USER_MODE_WORK)
/**
@ -259,12 +263,13 @@ static __always_inline void arch_exit_to_user_mode(void) { }
#endif
/**
* arch_do_signal - Architecture specific signal delivery function
* arch_do_signal_or_restart - Architecture specific signal delivery function
* @regs: Pointer to currents pt_regs
* @has_signal: actual signal to handle
*
* Invoked from exit_to_user_mode_loop().
*/
void arch_do_signal(struct pt_regs *regs);
void arch_do_signal_or_restart(struct pt_regs *regs, bool has_signal);
/**
* arch_syscall_exit_tracehook - Wrapper around tracehook_report_syscall_exit()