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powerpc: Add PPC_FEATURE2_HTM_NO_SUSPEND

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Some CPUs can operate in a mode where TM (Transactional Memory) is
enabled but the suspended state of TM is disabled. In this mode
tsuspend does not enter suspended state, instead the transaction is
aborted. Similarly any other event that would lead to suspended state
instead aborts the transaction.

There is also an ABI change, in that in this mode processes are not
allowed to sigreturn with an MSR that would lead to suspended state,
Linux will instead return an error to the sigreturn syscall.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman 2017-10-12 21:17:17 +11:00
parent 07fd1761e1
commit cba6ac4869
1 changed files with 1 additions and 0 deletions
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arch/powerpc/include/uapi/asm/cputable.h
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@ -48,6 +48,7 @@
#define PPC_FEATURE2_HAS_IEEE128 0x00400000 /* VSX IEEE Binary Float 128-bit */
#define PPC_FEATURE2_DARN 0x00200000 /* darn random number insn */
#define PPC_FEATURE2_SCV 0x00100000 /* scv syscall */
#define PPC_FEATURE2_HTM_NO_SUSPEND 0x00080000 /* TM w/out suspended state */
/*
* IMPORTANT!