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    Subject[PATCH 4/5] kcsan: Show message if enabled early
    From
    Show a message in the kernel log if KCSAN was enabled early.

    Signed-off-by: Marco Elver <elver@google.com>
    ---
    kernel/kcsan/core.c | 8 ++++++--
    1 file changed, 6 insertions(+), 2 deletions(-)

    diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c
    index e43a55643e00..23d0c4e4cd3a 100644
    --- a/kernel/kcsan/core.c
    +++ b/kernel/kcsan/core.c
    @@ -1,5 +1,7 @@
    // SPDX-License-Identifier: GPL-2.0

    +#define pr_fmt(fmt) "kcsan: " fmt
    +
    #include <linux/atomic.h>
    #include <linux/bug.h>
    #include <linux/delay.h>
    @@ -442,7 +444,7 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type)

    if (IS_ENABLED(CONFIG_KCSAN_DEBUG)) {
    kcsan_disable_current();
    - pr_err("KCSAN: watching %s, size: %zu, addr: %px [slot: %d, encoded: %lx]\n",
    + pr_err("watching %s, size: %zu, addr: %px [slot: %d, encoded: %lx]\n",
    is_write ? "write" : "read", size, ptr,
    watchpoint_slot((unsigned long)ptr),
    encode_watchpoint((unsigned long)ptr, size, is_write));
    @@ -601,8 +603,10 @@ void __init kcsan_init(void)
    * We are in the init task, and no other tasks should be running;
    * WRITE_ONCE without memory barrier is sufficient.
    */
    - if (kcsan_early_enable)
    + if (kcsan_early_enable) {
    + pr_info("enabled early\n");
    WRITE_ONCE(kcsan_enabled, true);
    + }
    }

    /* === Exported interface =================================================== */
    --
    2.28.0.163.g6104cc2f0b6-goog
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