On Mon, Jun 27, 2022 at 06:13:32PM +0200, Adam Sindelar wrote: > The test va_128TBswitch.c expects to be able to pass mmap an address hint > and length that cross the address 1<<47. This is not possible without > 5-level page tables, so the test fails. > > The test is already only run on 64-bit powerpc and x86 archs, but this > patch adds an additional check that skips the test if PG_TABLE_LEVELS < 5. > There is precedent for checking /proc/config.gz in selftests, e.g. in > selftests/firmware. > > Running `sudo make -C tools/testing/selftests TARGETS=vm run_tests` > produces the desired output: > > ``` > --------------------------- > running ./va_128TBswitch.sh > --------------------------- > ./va_128TBswitch.sh: PG_TABLE_LEVELS=4, must be >= 5 to run this test > [SKIP] > ------------------------------- > ``` Different subsystems have different workflows, but I don't recall having ever seen markdown used in any mm patches. Can you update the patch description to not use markdown? > v2: > - Function variables declared local > - Fixed variable name typo in Makefile > - Comment to explain gzip -dcfq Can you move the version-change descriptions out of the commit summary and into the patch itself, directly after the ---? We don't want it to be included in the changelog that eventually gets merged. This is described in more detail in [0]. [0] https://www.kernel.org/doc/html/latest/process/submitting-patches.html#the-canonical-patch-format > Signed-off-by: Adam Sindelar <adam@xxxxxxxxxxxx> > --- > tools/testing/selftests/vm/Makefile | 1 + > tools/testing/selftests/vm/run_vmtests.sh | 2 +- > tools/testing/selftests/vm/va_128TBswitch.sh | 39 ++++++++++++++++++++ > 3 files changed, 41 insertions(+), 1 deletion(-) > create mode 100755 tools/testing/selftests/vm/va_128TBswitch.sh > > diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile > index c45e535ff4b8..7860d0969888 100644 > --- a/tools/testing/selftests/vm/Makefile > +++ b/tools/testing/selftests/vm/Makefile > @@ -91,6 +91,7 @@ endif > TEST_PROGS := run_vmtests.sh > > TEST_FILES := test_vmalloc.sh > +TEST_FILES += va_128TBswitch.sh > > KSFT_KHDR_INSTALL := 1 > include ../lib.mk > diff --git a/tools/testing/selftests/vm/run_vmtests.sh b/tools/testing/selftests/vm/run_vmtests.sh > index a2302b5faaf2..edda7350ccca 100755 > --- a/tools/testing/selftests/vm/run_vmtests.sh > +++ b/tools/testing/selftests/vm/run_vmtests.sh > @@ -149,7 +149,7 @@ if [ $VADDR64 -ne 0 ]; then > run_test ./virtual_address_range > > # virtual address 128TB switch test > - run_test ./va_128TBswitch > + run_test ./va_128TBswitch.sh > fi # VADDR64 > > # vmalloc stability smoke test > diff --git a/tools/testing/selftests/vm/va_128TBswitch.sh b/tools/testing/selftests/vm/va_128TBswitch.sh > new file mode 100755 > index 000000000000..767a6465b5d2 > --- /dev/null > +++ b/tools/testing/selftests/vm/va_128TBswitch.sh > @@ -0,0 +1,39 @@ > +#!/bin/bash > +# SPDX-License-Identifier: GPL-2.0 > +# > +# Copyright (C) 2022 Adam Sindelar (Meta) <adam@xxxxxxxxxxxx> > +# > +# This is a test for mmap behavior with 5-level paging. This script wraps the > +# real test to check that the kernel is configured to support at least 5 > +# pagetable levels. > + > +# 1 means the test failed > +exitcode=1 Agreed that it's preferable to follow the contours that already exist in the vm/ tests, but IMO this is pretty confusing and should be fixed for the whole suite in a follow-on patch. Both ksft_skip and exitcode are exit codes so this variable name doesn't really make sense. > +# Kselftest framework requirement - SKIP code is 4. > +ksft_skip=4 > + > +die() Sorry, missed this on the first pass, but can we change the name of this function to fail() to show that we're failing the test rather than killing the testrun? > +{ > + echo "$1" > + exit $exitcode > +} > + > +check_test_requirements() > +{ > + local config="/proc/config.gz" > + [[ -f "${config}" ]] || config="/boot/config-$(uname -r)" > + [[ -f "${config}" ]] || die "Cannot find kernel config in /proc or /boot" > + > + # gzip -dcfq automatically handles both compressed and plaintext input. > + # See man 1 gzip under '-f'. > + local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2) > + > + if [[ "${pg_table_levels}" -lt 5 ]]; then > + echo "$0: PG_TABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test" > + exit $ksft_skip > + fi > +} > + > +check_test_requirements > +./va_128TBswitch > -- > 2.35.1
