powerpc/tm: Add checking to treclaim/trechkpt

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If we do a treclaim and we are not in TM suspend mode, it results in a TM bad
thing (ie. a 0x700 program check).  Similarly if we do a trechkpt and we have
an active transaction or TEXASR Failure Summary (FS) is not set, we also take a
TM bad thing.

This should never happen, but if it does (ie. a kernel bug), the cause is
almost impossible to debug as the GPR state is mostly userspace and hence we
don't get a call chain.

This adds some checks in these cases case a BUG_ON() (in asm) in case we ever
hit these cases.  It moves the register saving around to preserve r1 till later
also.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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This commit is contained in:

Michael Neuling 2014-03-28 16:40:34 +11:00 • committed by Benjamin Herrenschmidt

parent ce0ac1fc32

commit 7f06f21d40

2 changed files with 36 additions and 3 deletions

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arch/powerpc/include/asm/reg.h

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38

arch/powerpc/kernel/tm.S

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