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git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
Pull nolibc updates from Paul McKenney:
- Add s390 support
- Add support for the ARM Thumb1 instruction set
- Fix O_* flags definitions for open() and fcntl()
- Make errno a weak symbol instead of a static variable
- Export environ as a weak symbol
- Export _auxv as a weak symbol for auxilliary vector retrieval
- Implement getauxval() and getpagesize()
- Further improve self tests, including permitting userland testing of
the nolibc library
* tag 'nolibc.2023.02.06a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: (28 commits)
selftests/nolibc: Add a "run-user" target to test the program in user land
selftests/nolibc: Support "x86_64" for arch name
selftests/nolibc: Add `getpagesize(2)` selftest
nolibc/sys: Implement `getpagesize(2)` function
nolibc/stdlib: Implement `getauxval(3)` function
tools/nolibc: add auxiliary vector retrieval for s390
tools/nolibc: add auxiliary vector retrieval for mips
tools/nolibc: add auxiliary vector retrieval for riscv
tools/nolibc: add auxiliary vector retrieval for arm
tools/nolibc: add auxiliary vector retrieval for arm64
tools/nolibc: add auxiliary vector retrieval for x86_64
tools/nolibc: add auxiliary vector retrieval for i386
tools/nolibc: export environ as a weak symbol on s390
tools/nolibc: export environ as a weak symbol on riscv
tools/nolibc: export environ as a weak symbol on mips
tools/nolibc: export environ as a weak symbol on arm
tools/nolibc: export environ as a weak symbol on arm64
tools/nolibc: export environ as a weak symbol on i386
tools/nolibc: export environ as a weak symbol on x86_64
tools/nolibc: make errno a weak symbol instead of a static one
...
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This reduces the size of init from ~600KB to ~1KB.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Add the required values to identify_qemu() and
identify_bootimage().
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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This commit upgrades the kvm.sh script's --kconfig parameter to accept
string-valued Kconfig options with double-quoted string values.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Currently, the presence of any quoted-string Kconfig option in the
scenario files or the CFcommon file (aside from the special-cased
CONFIG_INITRAMFS_SOURCE option) will result in an "improperly set"
diagnostic. This commit updates configcheck.sh to strip double quotes
in order to permit string-valued Kconfig options to be handled correctly.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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The latest version of grep is deprecating the egrep command, so that
its output contains warnings as follows:
egrep: warning: egrep is obsolescent; using grep -E
Fix this using "grep -E" instead.
sed -i "s/egrep/grep -E/g" `grep egrep -rwl tools/testing/selftests/rcutorture`
Here are the steps to install the latest grep:
wget http://ftp.gnu.org/gnu/grep/grep-3.8.tar.gz
tar xf grep-3.8.tar.gz
cd grep-3.8 && ./configure && make
sudo make install
export PATH=/usr/local/bin:$PATH
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Under some conditions, a given run's vmlinux file will be compressed,
so that it is named vmlinux.xz rather than vmlinux. in such cases,
kvm-find-errors.sh will complain about the nonexistence of vmlinux.
This commit therefore causes kvm-find-errors.sh to check for vmlinux.xz
as well as for vmlinux.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Currently, if the torture.sh allmodconfig step fails, this is counted as
an error (as it should be), but there is also an extraneous complaint
about a missing log file. This commit therefore adds that log file,
which is hoped to reduce confused reactions to the error report.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Currently, torture.sh will compress the vmlinux files for KASAN and
KCSAN runs. But it will compress all of the files, including those
copied verbatim by the kvm-again.sh script. Compression takes around ten
minutes, so this is not a good thing. This commit therefore compresses
only one of a given set of identical vmlinux files, and then hard-links
it to the directories produced by kvm-again.sh.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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This commit causes torture.sh to use the new --bootargs and --datestamp
parameters to kvm-again.sh in order to avoid redundant kernel builds
during rcuscale and refscale testing. This trims the better part of an
hour off of torture.sh runs that use --do-kasan.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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This commit adds a --datestamp parameter to kvm-again.sh, which, in
contrast to the existing --rundir argument, specifies only the last
segments of the pathname. This addition enables torture.sh to use
kvm-again.sh in order to avoid redundant kernel builds.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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As it should, the kvm-recheck.sh script sets the TORTURE_SUITE bash
variable based on the type of rcutorture test being run. However,
it does not export it. Which is OK, at least until you try running
kvm-again.sh on either a rcuscale or a refscale test, at which point you
get false-positive "no success message, N successful version messages"
errors. This commit therefore causes the kvm-recheck.sh script to export
TORTURE_SUITE, suppressing these false positives.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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The kvm-again.sh script, when running locally, can place the QEMU output
into kvm-test-1-run-qemu.sh.out instead of kvm-test-1-run.sh.out. This
commit therefore makes kvm-test-1-run-qemu.sh check both locations.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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This commit drags the rcutorture scripting kicking and screaming into the
twenty-first century by making use of the BSD-derived mktemp command to
create temporary files and directories. In happy contrast to many of its
ill-behaved predecessors, mktemp seems to actually work reasonably reliably!
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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The kvm-again.sh script can be used to repeat short boot-time tests,
but the kernel boot arguments cannot be changed. This means that every
change in kernel boot arguments currently necessitates a kernel build,
which greatly increases the duration of kernel-boot testing.
This commit therefore adds a --bootargs parameter to kvm-again.sh,
which allows a given kernel to be repeatedly booted, but overriding
old and adding new kernel boot parameters. This allows an old kernel
to be booted with new kernel boot parameters, avoiding the overhead of
rebuilding the kernel under test.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Currently, kvm-check-branches.sh causes each kvm.sh invocation create a
separate date-stamped directory, then after that invocation completes,
moves it into the *-group/NNNN directory. This works, but makes it more
difficult to monitor an ongoing run. This commit therefore uses the
kvm.sh --datestamp argument to make kvm.sh put the output in the right
place to start with, and also dispenses with the additional level of
datestamping. (Those wanting datestamps can find them in the log files.)
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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A recent change to the DEBUG_INFO Kconfig option means that simply adding
CONFIG_DEBUG_INFO=y to the .config file and running "make oldconfig" no
longer works. It is instead necessary to add CONFIG_DEBUG_INFO_NONE=n
and (for example) CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y.
This combination will then result in CONFIG_DEBUG_INFO being selected.
This commit therefore updates the Kconfig options produced in response
to the kvm.sh --gdb, --kasan, and --kcsan Kconfig options.
Fixes: f9b3cd245784 ("Kconfig.debug: make DEBUG_INFO selectable from a choice")
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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If a remote system fails in certain ways, for example, if it is rebooted
without removing the contents of the /tmp directory, its remote.run file
never will be removed and the kvm-remote.sh script will loop waiting
forever. The manual workaround for this (hopefully!) rare event is to
manually remove the file, which will cause the results up to the reboot
to be collected and evaluated.
Unfortunately, to work out which system is holding things up, the user
must refer to the name of the last system whose results were collected,
then look up the name of the next system in sequence, then manually
remove the remote.run file. Even more unfortunately, this procedure can
be fooled in runs where each system handles more than one batch should
a given system take longer than expected, causing the systems to be
handled out of order.
This commit therefore causes kvm-remote.sh to print out the name of
the system it will wait on next, allowing the user to refer directly
to that name. Making the kvm-remote.sh script automatically handle
unscheduled termination of the qemu processes is left as future work.
Quite possibly deep future work.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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'rcu-tasks.2022.04.11b', 'srcu.2022.05.03a', 'torture.2022.04.11b', 'torture-tasks.2022.04.20a' and 'torturescript.2022.04.20a' into HEAD
docs.2022.04.20a: Documentation updates.
fixes.2022.04.20a: Miscellaneous fixes.
nocb.2022.04.11b: Callback-offloading updates.
rcu-tasks.2022.04.11b: RCU-tasks updates.
srcu.2022.05.03a: Put SRCU on a memory diet.
torture.2022.04.11b: Torture-test updates.
torture-tasks.2022.04.20a: Avoid torture testing changing RCU configuration.
torturescript.2022.04.20a: Torture-test scripting updates.
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The torture.sh script provides extra memory for scftorture and rcuscale.
However, the total memory provided is only 1G, which is less than the
2G that is required for KASAN testing. This commit therefore ups the
torture.sh script's 1G to 2G.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Now that the Tasks RCU flavors are selected by their users rather than
by the rcutorture scenarios, torture.sh fails when attempting to run
NOPREEMPT scenarios for refscale and rcuscale. This commit therefore
makes torture.sh specify CONFIG_TASKS_TRACE_RCU=y to avoid such failure.
Why not also CONFIG_TASKS_RCU? Because tracing selects this one.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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KASAN allots significant memory to track allocation state, and the amount
of memory has increased recently, which results in frequent OOMs on a
few of the rcutorture scenarios. This commit therefore provides 2G of
memory for --kasan runs, up from the 512M default.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Currently, torture.sh saves only the build output and exit code from the
"make allmodconfig" test. This commit also saves the .config file.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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There is an extraneous "scf" in the per_version_boot_params shell function
used by scftorture. No harm done in that it is just passed as an argument
to the /init program in initrd, but this commit nevertheless removes it.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Now that CONFIG_PREEMPT_DYNAMIC=y is the default, kernels that are
ostensibly built with CONFIG_PREEMPT_NONE=y or CONFIG_PREEMPT_VOLUNTARY=y
are now actually built with CONFIG_PREEMPT=y, but are by default booted
so as to disable preemption. Although this allows much more flexibility
from a single kernel binary, it means that the current rcutorture
scenarios won't find build errors that happen only when preemption is
fully disabled at build time.
This commit therefore adds CONFIG_PREEMPT_DYNAMIC=n to several scenarios,
and while in the area switches one from CONFIG_PREEMPT_NONE=y to
CONFIG_PREEMPT_VOLUNTARY=y to add coverage of this Kconfig option.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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This commit passes the csdlock_debug=1 kernel parameter in order to
enable CSD-lock stall reports for torture.sh scftorure runs.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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The kvm-again.sh script reruns an previously built set of kernels, so
the vmlinux files are associated with that previous run, not this on.
This results in kvm-find_errors.sh reporting spurious failed-build errors.
This commit therefore omits the vmlinux check for kvm-again.sh runs.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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This commit adjusts the scftorture PREEMPT and NOPREEMPT scenarios to
account for the TASKS_RCU Kconfig option being explicitly selected rather
than computed in isolation.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Currently, a CONFIG_PREEMPT_NONE=y kernel substitutes normal RCU for
RCU Tasks Rude and RCU Tasks Trace. Unless that kernel builds rcuscale,
whether built-in or as a module, in which case these RCU Tasks flavors are
(unnecessarily) built in. This both increases kernel size and increases
the complexity of certain tracing operations. This commit therefore
decouples the presence of rcuscale from the presence of RCU Tasks Rude
and RCU Tasks Trace.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Currently, a CONFIG_PREEMPT_NONE=y kernel substitutes normal RCU for
RCU Tasks. Unless that kernel builds rcuscale, whether built-in or as
a module, in which case RCU Tasks is (unnecessarily) built. This both
increases kernel size and increases the complexity of certain tracing
operations. This commit therefore decouples the presence of rcuscale
from the presence of RCU Tasks.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Currently, a CONFIG_PREEMPT_NONE=y kernel substitutes normal RCU for
RCU Tasks Rude and RCU Tasks Trace. Unless that kernel builds refscale,
whether built-in or as a module, in which case these RCU Tasks flavors are
(unnecessarily) built in. This both increases kernel size and increases
the complexity of certain tracing operations. This commit therefore
decouples the presence of refscale from the presence of RCU Tasks Rude
and RCU Tasks Trace.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Currently, a CONFIG_PREEMPT_NONE=y kernel substitutes normal RCU for
RCU Tasks. Unless that kernel builds refscale, whether built-in or as a
module, in which case RCU Tasks is (unnecessarily) built in. This both
increases kernel size and increases the complexity of certain tracing
operations. This commit therefore decouples the presence of refscale
from the presence of RCU Tasks.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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The rcutorture test suite makes double use of the rcutorture.stat_interval
module parameter. As its name suggests, it controls the frequency
of statistics printing, but it also controls the rcu_torture_writer()
stall timeout. The current setting of 15 seconds works surprisingly well.
However, given that the RCU tasks stall-warning timeout is ten -minutes-,
15 seconds is too short for TASKS02, which runs a non-preemptible kernel
on a single CPU.
This commit therefore adds checks for per-scenario specification of the
rcutorture.stat_interval module parameter.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Now that CONFIG_PREEMPT_DYNAMIC=y is the default, TASKS02 no longer
builds a pure non-preemptible kernel that uses Tiny RCU. This commit
therefore fixes this new hole in rcutorture testing by adding
CONFIG_PREEMPT_DYNAMIC=n to the TASKS02 rcutorture scenario.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Unless a kernel builds rcutorture, whether built-in or as a module, that
kernel is also built with CONFIG_TASKS_RUDE_RCU, whether anything else
needs Tasks Rude RCU or not. This unnecessarily increases kernel size.
This commit therefore decouples the presence of rcutorture from the
presence of RCU Tasks Rude.
However, there is a need to select CONFIG_TASKS_RUDE_RCU for testing
purposes. Except that casual users must not be bothered with
questions -- for them, this needs to be fully automated. There is
thus a CONFIG_FORCE_TASKS_RUDE_RCU that selects CONFIG_TASKS_RUDE_RCU,
is user-selectable, but which depends on CONFIG_RCU_EXPERT.
[ paulmck: Apply kernel test robot feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Currently, a CONFIG_PREEMPT_NONE=y kernel substitutes normal RCU for
RCU Tasks. Unless that kernel builds rcutorture, whether built-in or as
a module, in which case RCU Tasks is (unnecessarily) used. This both
increases kernel size and increases the complexity of certain tracing
operations. This commit therefore decouples the presence of rcutorture
from the presence of RCU Tasks.
However, there is a need to select CONFIG_TASKS_RCU for testing purposes.
Except that casual users must not be bothered with questions -- for them,
this needs to be fully automated. There is thus a CONFIG_FORCE_TASKS_RCU
that selects CONFIG_TASKS_RCU, is user-selectable, but which depends
on CONFIG_RCU_EXPERT.
[ paulmck: Apply kernel test robot feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Unless a kernel builds rcutorture, whether built-in or as a module, that
kernel is also built with CONFIG_TASKS_TRACE_RCU, whether anything else
needs Tasks Trace RCU or not. This unnecessarily increases kernel size.
This commit therefore decouples the presence of rcutorture from the
presence of RCU Tasks Trace.
However, there is a need to select CONFIG_TASKS_TRACE_RCU for
testing purposes. Except that casual users must not be bothered with
questions -- for them, this needs to be fully automated. There is thus
a CONFIG_FORCE_TASKS_TRACE_RCU that selects CONFIG_TASKS_TRACE_RCU,
is user-selectable, but which depends on CONFIG_RCU_EXPERT.
[ paulmck: Apply kernel test robot feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Currently, any kernel built with CONFIG_PREEMPTION=y also gets
CONFIG_TASKS_RCU=y, which is not helpful to people trying to build
preemptible kernels of minimal size.
Because CONFIG_TASKS_RCU=y is needed only in kernels doing tracing of
one form or another, this commit moves from TASKS_RCU deciding when it
should be enabled to the tracing Kconfig options explicitly selecting it.
This allows building preemptible kernels without TASKS_RCU, if desired.
This commit also updates the SRCU-N and TREE09 rcutorture scenarios
in order to avoid Kconfig errors that would otherwise result from
CONFIG_TASKS_RCU being selected without its CONFIG_RCU_EXPERT dependency
being met.
[ paulmck: Apply BPF_SYSCALL feedback from Andrii Nakryiko. ]
Reported-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Tested-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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For consecutive numbers the lscpu command collapses the output and just
shows the range with start and end. The processors are numbered that
way on POWER8.
$ sudo ppc64_cpu --smt=8
$ lscpu | grep '^NUMA node'
NUMA node(s): 2
NUMA node0 CPU(s): 0-79
NUMA node8 CPU(s): 80-159
This causes the heuristic to detect the number threads per core, looking
for the number after the first comma, to fail, and QEMU aborts because of
invalid arguments.
$ lscpu | grep '^NUMA node0' | sed -e 's/^[^,-]*(,|\-)\([0-9]*\),.*$/\1/'
NUMA node0 CPU(s): 0-79
But the lscpu command shows the number of threads per core:
$ sudo ppc64_cpu --smt=8
$ lscpu | grep 'Thread(s) per core'
Thread(s) per core: 8
$ sudo ppc64_cpu --smt=off
$ lscpu | grep 'Thread(s) per core'
Thread(s) per core: 1
This commit therefore directly uses that value and replaces use of grep
with "sed -n" and its "p" command.
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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This commit weakens the checks of the kvm.sh script's --torture parameter
and the kvm-recheck.sh script's parsing so that experimental torture tests
may be created without updating these two scripts. The changes required
are to the appropriate Makefile and Kconfig file, plus a directory
whose name begins with "X" must be added to the rcutorture/configs file.
This new directory's name can then be passed in via the kvm.sh script's
--torture parameter.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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The torture.sh script normally runs unattended, so there is not much
point in the "ssh" command asking for a password. This commit therefore
adds the "-o Batchmode=yes" argument to each "ssh" command to cause it
to fail rather than ask for a password.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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An "echo" slipped in between an "ssh" and the "ret=$?" that was intended
to collect its exit code, which prevents torture.sh from detecting
"ssh" failure. This commit therefore reassociates the two.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Currently, the rcupdate.rcu_normal and rcupdate.rcu_expedited kernel
boot parameters are not regularly tested. The potential addition of
polled expedited grace-period APIs increases the amount of code that is
affected by these kernel boot parameters. This commit therefore adds a
"--do-rt" argument to torture.sh to exercise these kernel-boot options.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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This commit adjusts RUDE01 to 3 CPUs and TRACE01 to 5 CPUs in order to
test Tasks RCU's ability to handle non-power-of-two numbers of CPUs.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Thie commit adds kernel boot parameters to the SRCU-N and SRCU-P
rcutorture scenarios to cause SRCU-N to test contention-based resizing
and SRCU-P to test init_srcu_struct()-time resizing. Note that this
also tests never-resizing because the contention-based resizing normally
takes some minutes to make the shift.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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This commit fixes a couple of typos: s/--doall/--do-all/ and
s/--doallmodconfig/--do-allmodconfig/.
[ paulmck: Add Fixes: supplied by Paul Menzel. ]
Fixes: a115a775a8d5 ("torture: Add "make allmodconfig" to torture.sh")
Reported-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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The torture-test scripting's long-standing use of KVM as the environment
variable tracking the pathname of the rcutorture directory now conflicts
with allmodconfig builds due to the virt/kvm/Makefile.kvm file's use
of this as a makefile variable. This commit therefore changes the
torture-test scripting from KVM to RCUTORTURE, avoiding the name conflict.
Reported-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Tested-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Currently, an obtuse compiler diagnostic can fool kvm-find-errors.sh
into believing that the build was successful. This commit therefore
adds a check for a missing vmlinux file. Note that in the case of
repeated torture-test scenarios ("--configs '2*TREE01'"), the vmlinux
file will only be present in the first directory, that is, in TREE01
but not TREE01.2.
Link: https://lore.kernel.org/lkml/36bd91e4-8eda-5677-7fde-40295932a640@molgen.mpg.de/
Reported-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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The torture.sh scripts currently duplicates the summary lines, getting
one during the run phase and one during the summary phase of each run.
This commit therefore removes the run phase from consideration so as to
get only one summary line per run.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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This commit ups the retries for downloading the build-product tarball
to a given remote system from once to five times, the better to handle
transient network failures.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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