kernel/tools/testing/selftests/powerpc/tm/tm-syscall.c, branch linux-5.2.y

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 191

2019-05-30T18:29:21Z

Based on 1 normalized pattern(s): licensed under gplv2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 99 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Alexios Zavras Reviewed-by: Richard Fontana Reviewed-by: Allison Randal Reviewed-by: Steve Winslow Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528170027.163048684@linutronix.de Signed-off-by: Greg Kroah-Hartman

selftests/powerpc: exec() with suspended transaction

2016-07-26T04:28:22Z

Perform an exec() class syscall with a suspended transaction. This is a test for the bug we fixed in 8e96a87c5431 ("powerpc/tm: Always reclaim in start_thread() for exec() class syscalls"). Signed-off-by: Cyril Bur [mpe: Fix build errors, use a single binary for the test] Signed-off-by: Michael Ellerman

selftests/powerpc: Move TM helpers into tm.h

2015-12-14T09:41:48Z

Move have_htm_nosc() into a new tm.h, and add a new helper, have_htm() which we'll use in the next patch. Signed-off-by: Michael Ellerman

selftests/powerpc: Add have_hwcap2() helper

2015-12-14T09:41:47Z

We already do this twice and want to add another so add a helper. Signed-off-by: Michael Ellerman

selftests/powerpc: Allow the tm-syscall test to build with old headers

2015-10-15T09:32:04Z

When building against older kernel headers, currently the tm-syscall test fails to build because PPC_FEATURE2_HTM_NOSC is not defined. Tweak the test so that if PPC_FEATURE2_HTM_NOSC is not defined it still builds, but prints a warning at run time and marks the test as skipped. Signed-off-by: Michael Ellerman

powerpc/tm: Abort syscalls in active transactions

2015-06-19T07:10:28Z

This patch changes the syscall handler to doom (tabort) active transactions when a syscall is made and return very early without performing the syscall and keeping side effects to a minimum (no CPU accounting or system call tracing is performed). Also included is a new HWCAP2 bit, PPC_FEATURE2_HTM_NOSC, to indicate this behaviour to userspace. Currently, the system call instruction automatically suspends an active transaction which causes side effects to persist when an active transaction fails. This does change the kernel's behaviour, but in a way that was documented as unsupported. It doesn't reduce functionality as syscalls will still be performed after tsuspend; it just requires that the transaction be explicitly suspended. It also provides a consistent interface and makes the behaviour of user code substantially the same across powerpc and platforms that do not support suspended transactions (e.g. x86 and s390). Performance measurements using http://ozlabs.org/~anton/junkcode/null_syscall.c indicate the cost of a normal (non-aborted) system call increases by about 0.25%. Signed-off-by: Sam Bobroff Signed-off-by: Michael Ellerman

selftests/powerpc: Add transactional syscall test

2015-04-11T10:49:20Z

Check that a syscall made during an active transaction will fail with the correct failure code and that one made during a suspended transaction will succeed. Signed-off-by: Sam Bobroff Signed-off-by: Michael Ellerman