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authorMark Rutland <mark.rutland@arm.com>2021-04-14 13:28:19 +0200
committerPaul E. McKenney <paulmck@kernel.org>2021-05-18 19:58:14 +0200
commit95f7524d7f0c6fddbc24fb623d61b7d508626f41 (patch)
tree2a759a1e5fa31fcc044ae14f1f4d75e59989c2e8 /kernel/kcsan
parentkcsan: Distinguish kcsan_report() calls (diff)
downloadlinux-95f7524d7f0c6fddbc24fb623d61b7d508626f41.tar.xz
linux-95f7524d7f0c6fddbc24fb623d61b7d508626f41.zip
kcsan: Refactor passing watchpoint/other_info
The `watchpoint_idx` argument to kcsan_report() isn't meaningful for races which were not detected by a watchpoint, and it would be clearer if callers passed the other_info directly so that a NULL value can be passed in this case. Given that callers manipulate their watchpoints before passing the index into kcsan_report_*(), and given we index the `other_infos` array using this before we sanity-check it, the subsequent sanity check isn't all that useful. Let's remove the `watchpoint_idx` sanity check, and move the job of finding the `other_info` out of kcsan_report(). Other than the removal of the check, there should be no functional change as a result of this patch. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/kcsan')
-rw-r--r--kernel/kcsan/report.c13
1 files changed, 4 insertions, 9 deletions
diff --git a/kernel/kcsan/report.c b/kernel/kcsan/report.c
index 5232bf218ea7..88225f6d471e 100644
--- a/kernel/kcsan/report.c
+++ b/kernel/kcsan/report.c
@@ -600,7 +600,7 @@ static noinline bool prepare_report(unsigned long *flags,
static void kcsan_report(const volatile void *ptr, size_t size, int access_type,
enum kcsan_value_change value_change,
- enum kcsan_report_type type, int watchpoint_idx)
+ enum kcsan_report_type type, struct other_info *other_info)
{
unsigned long flags = 0;
const struct access_info ai = {
@@ -610,12 +610,8 @@ static void kcsan_report(const volatile void *ptr, size_t size, int access_type,
.task_pid = in_task() ? task_pid_nr(current) : -1,
.cpu_id = raw_smp_processor_id()
};
- struct other_info *other_info = type == KCSAN_REPORT_RACE_UNKNOWN_ORIGIN
- ? NULL : &other_infos[watchpoint_idx];
kcsan_disable_current();
- if (WARN_ON(watchpoint_idx < 0 || watchpoint_idx >= ARRAY_SIZE(other_infos)))
- goto out;
/*
* Because we may generate reports when we're in scheduler code, the use
@@ -642,7 +638,6 @@ static void kcsan_report(const volatile void *ptr, size_t size, int access_type,
}
lockdep_on();
-out:
kcsan_enable_current();
}
@@ -650,18 +645,18 @@ void kcsan_report_set_info(const volatile void *ptr, size_t size, int access_typ
int watchpoint_idx)
{
kcsan_report(ptr, size, access_type, KCSAN_VALUE_CHANGE_MAYBE,
- KCSAN_REPORT_CONSUMED_WATCHPOINT, watchpoint_idx);
+ KCSAN_REPORT_CONSUMED_WATCHPOINT, &other_infos[watchpoint_idx]);
}
void kcsan_report_known_origin(const volatile void *ptr, size_t size, int access_type,
enum kcsan_value_change value_change, int watchpoint_idx)
{
kcsan_report(ptr, size, access_type, value_change,
- KCSAN_REPORT_RACE_SIGNAL, watchpoint_idx);
+ KCSAN_REPORT_RACE_SIGNAL, &other_infos[watchpoint_idx]);
}
void kcsan_report_unknown_origin(const volatile void *ptr, size_t size, int access_type)
{
kcsan_report(ptr, size, access_type, KCSAN_VALUE_CHANGE_TRUE,
- KCSAN_REPORT_RACE_UNKNOWN_ORIGIN, 0);
+ KCSAN_REPORT_RACE_UNKNOWN_ORIGIN, NULL);
}