MIPS: Fix watchpoint restoration

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commit a7e89326b4 upstream.

Commit f51246efee ("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
Patchwork: https://patchwork.linux-mips.org/patch/12726/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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James Hogan 2016-03-01 22:19:36 +00:00 • committed by Greg Kroah-Hartman

parent d59a1b85d6

commit 68d64569ff

4 changed files with 9 additions and 10 deletions

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2

arch/mips/include/asm/switch_to.h

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10

arch/mips/include/asm/watch.h

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2

arch/mips/kernel/pm.c

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5

arch/mips/kernel/watch.c

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