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kcsan: Remove debugfs test command

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Remove the debugfs test command, as it is no longer needed now that we
have the KUnit+Torture based kcsan-test module. This is to avoid
confusion around how KCSAN should be tested, as only the kcsan-test
module is maintained.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Marco Elver 2020-07-31 10:17:21 +02:00 committed by Paul E. McKenney
parent a4e74fa5f0
commit 4700ccdf18
1 changed files with 0 additions and 66 deletions
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66
kernel/kcsan/debugfs.c
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@ -98,66 +98,6 @@ static noinline void microbenchmark(unsigned long iters)
current->kcsan_ctx = ctx_save;
}
/*
* Simple test to create conflicting accesses. Write 'test=<iters>' to KCSAN's
* debugfs file from multiple tasks to generate real conflicts and show reports.
*/
static long test_dummy;
static long test_flags;
static long test_scoped;
static noinline void test_thread(unsigned long iters)
{
const long CHANGE_BITS = 0xff00ff00ff00ff00L;
const struct kcsan_ctx ctx_save = current->kcsan_ctx;
cycles_t cycles;
/* We may have been called from an atomic region; reset context. */
memset(&current->kcsan_ctx, 0, sizeof(current->kcsan_ctx));
pr_info("KCSAN: %s begin | iters: %lu\n", __func__, iters);
pr_info("test_dummy@%px, test_flags@%px, test_scoped@%px,\n",
&test_dummy, &test_flags, &test_scoped);
cycles = get_cycles();
while (iters--) {
/* These all should generate reports. */
__kcsan_check_read(&test_dummy, sizeof(test_dummy));
ASSERT_EXCLUSIVE_WRITER(test_dummy);
ASSERT_EXCLUSIVE_ACCESS(test_dummy);
ASSERT_EXCLUSIVE_BITS(test_flags, ~CHANGE_BITS); /* no report */
__kcsan_check_read(&test_flags, sizeof(test_flags)); /* no report */
ASSERT_EXCLUSIVE_BITS(test_flags, CHANGE_BITS); /* report */
__kcsan_check_read(&test_flags, sizeof(test_flags)); /* no report */
/* not actually instrumented */
WRITE_ONCE(test_dummy, iters); /* to observe value-change */
__kcsan_check_write(&test_dummy, sizeof(test_dummy));
test_flags ^= CHANGE_BITS; /* generate value-change */
__kcsan_check_write(&test_flags, sizeof(test_flags));
BUG_ON(current->kcsan_ctx.scoped_accesses.prev);
{
/* Should generate reports anywhere in this block. */
ASSERT_EXCLUSIVE_WRITER_SCOPED(test_scoped);
ASSERT_EXCLUSIVE_ACCESS_SCOPED(test_scoped);
BUG_ON(!current->kcsan_ctx.scoped_accesses.prev);
/* Unrelated accesses. */
__kcsan_check_access(&cycles, sizeof(cycles), 0);
__kcsan_check_access(&cycles, sizeof(cycles), KCSAN_ACCESS_ATOMIC);
}
BUG_ON(current->kcsan_ctx.scoped_accesses.prev);
}
cycles = get_cycles() - cycles;
pr_info("KCSAN: %s end | cycles: %llu\n", __func__, cycles);
/* restore context */
current->kcsan_ctx = ctx_save;
}
static int cmp_filterlist_addrs(const void *rhs, const void *lhs)
{
const unsigned long a = *(const unsigned long *)rhs;
@ -306,12 +246,6 @@ debugfs_write(struct file *file, const char __user *buf, size_t count, loff_t *o
if (kstrtoul(&arg[strlen("microbench=")], 0, &iters))
return -EINVAL;
microbenchmark(iters);
} else if (str_has_prefix(arg, "test=")) {
unsigned long iters;
if (kstrtoul(&arg[strlen("test=")], 0, &iters))
return -EINVAL;
test_thread(iters);
} else if (!strcmp(arg, "whitelist")) {
set_report_filterlist_whitelist(true);
} else if (!strcmp(arg, "blacklist")) {