forked from luck/tmp_suning_uos_patched
a7e89326b4
Commitf51246efee("MIPS: Get rid of finish_arch_switch().") moved the __restore_watch() call from finish_arch_switch() (i.e. after resume() returns) to before the resume() call in switch_to(). This results in watchpoints only being restored when a task is descheduled, preventing the watchpoints from being effective most of the time, except due to chance before the watchpoints are lazily removed. Fix the call sequence from switch_to() through to mips_install_watch_registers() to pass the task_struct pointer of the next task, instead of using current. This allows the watchpoints for the next (non-current) task to be restored without reintroducing finish_arch_switch(). Fixes:f51246efee("MIPS: Get rid of finish_arch_switch().") Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Cc: <stable@vger.kernel.org> # 4.3.x- Patchwork: https://patchwork.linux-mips.org/patch/12726/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
33 lines
827 B
C
33 lines
827 B
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2008 David Daney
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*/
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#ifndef _ASM_WATCH_H
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#define _ASM_WATCH_H
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#include <linux/bitops.h>
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#include <asm/mipsregs.h>
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void mips_install_watch_registers(struct task_struct *t);
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void mips_read_watch_registers(void);
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void mips_clear_watch_registers(void);
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void mips_probe_watch_registers(struct cpuinfo_mips *c);
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#ifdef CONFIG_HARDWARE_WATCHPOINTS
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#define __restore_watch(task) do { \
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if (unlikely(test_bit(TIF_LOAD_WATCH, \
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&task_thread_info(task)->flags))) { \
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mips_install_watch_registers(task); \
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} \
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} while (0)
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#else
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#define __restore_watch(task) do {} while (0)
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#endif
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#endif /* _ASM_WATCH_H */
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