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Revert: "powerpc/tm: Check for already reclaimed tasks"

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This reverts commit e924c60db1b4891e45d15a33474ac5fab62cf029 which was
commit 7f821fc9c77a9b01fe7b1d6e72717b33d8d64142 upstream.

It shouldn't have been applied as the original was already in 4.4.

Reported-by: Jiri Slaby <jslaby@suse.cz>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2016-05-06 12:03:29 -04:00
parent 1a1a512b98
commit a9bd748299
1 changed files with 0 additions and 18 deletions
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18
arch/powerpc/kernel/process.c
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@ -551,24 +551,6 @@ static void tm_reclaim_thread(struct thread_struct *thr,
msr_diff &= MSR_FP | MSR_VEC | MSR_VSX | MSR_FE0 | MSR_FE1;
}
/*
* Use the current MSR TM suspended bit to track if we have
* checkpointed state outstanding.
* On signal delivery, we'd normally reclaim the checkpointed
* state to obtain stack pointer (see:get_tm_stackpointer()).
* This will then directly return to userspace without going
* through __switch_to(). However, if the stack frame is bad,
* we need to exit this thread which calls __switch_to() which
* will again attempt to reclaim the already saved tm state.
* Hence we need to check that we've not already reclaimed
* this state.
* We do this using the current MSR, rather tracking it in
* some specific thread_struct bit, as it has the additional
* benifit of checking for a potential TM bad thing exception.
*/
if (!MSR_TM_SUSPENDED(mfmsr()))
return;
/*
* Use the current MSR TM suspended bit to track if we have
* checkpointed state outstanding.