[PATCH] lockdep: annotate on-stack completions

lockdep needs to have the waitqueue lock initialized for on-stack waitqueues
implicitly initialized by DECLARE_COMPLETION().  Annotate on-stack completions
accordingly.

Has no effect on non-lockdep kernels.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/x86_64/kernel/smpboot.c b/arch/x86_64/kernel/smpboot.c
index 9705a6a..b7c7059 100644 (file)
--- a/arch/x86_64/kernel/smpboot.c
+++ b/arch/x86_64/kernel/smpboot.c
@@ -775,6 +775,8 @@ static int __cpuinit do_boot_cpu(int cpu, int apicid)
        };
        DECLARE_WORK(work, do_fork_idle, &c_idle);
 
+       lockdep_set_class(&c_idle.done.wait.lock, &waitqueue_lock_key);
+
        /* allocate memory for gdts of secondary cpus. Hotplug is considered */
        if (!cpu_gdt_descr[cpu].address &&
                !(cpu_gdt_descr[cpu].address = get_zeroed_page(GFP_KERNEL))) {

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 5813d63..ab17c72 100644 (file)
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -2516,7 +2516,7 @@ EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);
 int blk_execute_rq(request_queue_t *q, struct gendisk *bd_disk,
                   struct request *rq, int at_head)
 {
-       DECLARE_COMPLETION(wait);
+       DECLARE_COMPLETION_ONSTACK(wait);
        char sense[SCSI_SENSE_BUFFERSIZE];
        int err = 0;
 

diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index d6bf1ec..fb67952 100644 (file)
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -1705,7 +1705,7 @@ int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t actio
 {
        unsigned long flags;
        ide_hwgroup_t *hwgroup = HWGROUP(drive);
-       DECLARE_COMPLETION(wait);
+       DECLARE_COMPLETION_ONSTACK(wait);
        int where = ELEVATOR_INSERT_BACK, err;
        int must_wait = (action == ide_wait || action == ide_head_wait);
 

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 82caba4..1c960ac 100644 (file)
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -1001,7 +1001,7 @@ unsigned ata_exec_internal(struct ata_device *dev,
        struct ata_queued_cmd *qc;
        unsigned int tag, preempted_tag;
        u32 preempted_sactive, preempted_qc_active;
-       DECLARE_COMPLETION(wait);
+       DECLARE_COMPLETION_ONSTACK(wait);
        unsigned long flags;
        unsigned int err_mask;
        int rc;

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index ed1cdf6..146298a 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -510,7 +510,7 @@ static void spi_complete(void *arg)
  */
 int spi_sync(struct spi_device *spi, struct spi_message *message)
 {
-       DECLARE_COMPLETION(done);
+       DECLARE_COMPLETION_ONSTACK(done);
        int status;
 
        message->complete = spi_complete;

diff --git a/kernel/kmod.c b/kernel/kmod.c
index 1b7157a..1d32def 100644 (file)
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -233,7 +233,7 @@ static void __call_usermodehelper(void *data)
 int call_usermodehelper_keys(char *path, char **argv, char **envp,
                             struct key *session_keyring, int wait)
 {
-       DECLARE_COMPLETION(done);
+       DECLARE_COMPLETION_ONSTACK(done);
        struct subprocess_info sub_info = {
                .complete       = &done,
                .path           = path,