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Merge tag 'kcsan.2024.05.10a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

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Pull kcsan update from Paul McKenney:
 "Introduce __data_racy type qualifier

  This adds a __data_racy type qualifier that enables kernel developers
  to inform KCSAN that a given variable is a shared variable without
  needing to mark each and every access.

  This allows pre-KCSAN code to be correctly (if approximately)
  instrumented withh very little effort, and also provides people
  reading the code a clear indication that the variable is in fact
  shared.

  In addition, it permits incremental transition to per-access KCSAN
  marking, so that (for example) a given subsystem can be transitioned
  one variable at a time, while avoiding large numbers of KCSAN warnings
  during this transition"

* tag 'kcsan.2024.05.10a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
  kcsan, compiler_types: Introduce __data_racy type qualifier
This commit is contained in:
Linus Torvalds
2024-05-13 10:13:39 -07:00
parent ee20260136 31f605a308
commit c07ea940a0
3 changed files with 34 additions and 0 deletions
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17
kernel/kcsan/kcsan_test.c
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@@ -304,6 +304,7 @@ static long test_array[3 * PAGE_SIZE / sizeof(long)];
static struct {
long val[8];
} test_struct;
static long __data_racy test_data_racy;
static DEFINE_SEQLOCK(test_seqlock);
static DEFINE_SPINLOCK(test_spinlock);
static DEFINE_MUTEX(test_mutex);
@@ -358,6 +359,8 @@ static noinline void test_kernel_write_uninstrumented(void) { test_var++; }
static noinline void test_kernel_data_race(void) { data_race(test_var++); }
static noinline void test_kernel_data_racy_qualifier(void) { test_data_racy++; }
static noinline void test_kernel_assert_writer(void)
{
ASSERT_EXCLUSIVE_WRITER(test_var);
@@ -1009,6 +1012,19 @@ static void test_data_race(struct kunit *test)
KUNIT_EXPECT_FALSE(test, match_never);
}
/* Test the __data_racy type qualifier. */
__no_kcsan
static void test_data_racy_qualifier(struct kunit *test)
{
bool match_never = false;
begin_test_checks(test_kernel_data_racy_qualifier, test_kernel_data_racy_qualifier);
do {
match_never = report_available();
} while (!end_test_checks(match_never));
KUNIT_EXPECT_FALSE(test, match_never);
}
__no_kcsan
static void test_assert_exclusive_writer(struct kunit *test)
{
@@ -1424,6 +1440,7 @@ static struct kunit_case kcsan_test_cases[] = {
KCSAN_KUNIT_CASE(test_read_plain_atomic_rmw),
KCSAN_KUNIT_CASE(test_zero_size_access),
KCSAN_KUNIT_CASE(test_data_race),
KCSAN_KUNIT_CASE(test_data_racy_qualifier),
KCSAN_KUNIT_CASE(test_assert_exclusive_writer),
KCSAN_KUNIT_CASE(test_assert_exclusive_access),
KCSAN_KUNIT_CASE(test_assert_exclusive_access_writer),