mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 05:11:48 +00:00
faea623464
The save_fp_context()/restore_fp_context() might sleep on accessing user stack and therefore might lose FPU ownership in middle of them. If these function failed due to "in_atomic" test in do_page_fault, touch the sigcontext area in non-atomic context and retry these save/restore operation. This is a replacement of a (broken) fix which was titled "Allow CpU exception in kernel partially". Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright (C) 1994 - 2000 Ralf Baechle
|
|
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
|
|
*/
|
|
|
|
#ifndef __SIGNAL_COMMON_H
|
|
#define __SIGNAL_COMMON_H
|
|
|
|
/* #define DEBUG_SIG */
|
|
|
|
#ifdef DEBUG_SIG
|
|
# define DEBUGP(fmt, args...) printk("%s: " fmt, __FUNCTION__ , ##args)
|
|
#else
|
|
# define DEBUGP(fmt, args...)
|
|
#endif
|
|
|
|
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
|
|
|
|
/*
|
|
* Determine which stack to use..
|
|
*/
|
|
extern void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
|
|
size_t frame_size);
|
|
/*
|
|
* install trampoline code to get back from the sig handler
|
|
*/
|
|
extern int install_sigtramp(unsigned int __user *tramp, unsigned int syscall);
|
|
|
|
/* Check and clear pending FPU exceptions in saved CSR */
|
|
extern int fpcsr_pending(unsigned int __user *fpcsr);
|
|
|
|
/* Make sure we will not lose FPU ownership */
|
|
#ifdef CONFIG_PREEMPT
|
|
#define lock_fpu_owner() preempt_disable()
|
|
#define unlock_fpu_owner() preempt_enable()
|
|
#else
|
|
#define lock_fpu_owner() pagefault_disable()
|
|
#define unlock_fpu_owner() pagefault_enable()
|
|
#endif
|
|
|
|
#endif /* __SIGNAL_COMMON_H */
|