path: root/drivers/hv
diff options
authorJohn Ogness <>2021-03-03 11:15:25 +0100
committerPetr Mladek <>2021-03-08 11:43:27 +0100
commitf9f3f02db98bbe678a8e57fe9432b196174744a3 (patch)
treea788ed5cb2ff8ed46a25336400f2c23d6ba0a20c /drivers/hv
parent5f6c7648e556f41a3064bb6dceb9e102c50b618d (diff)
printk: introduce a kmsg_dump iterator
Rather than storing the iterator information in the registered kmsg_dumper structure, create a separate iterator structure. The kmsg_dump_iter structure can reside on the stack of the caller, thus allowing lockless use of the kmsg_dump functions. Update code that accesses the kernel logs using the kmsg_dumper structure to use the new kmsg_dump_iter structure. For kmsg_dumpers, this also means adding a call to kmsg_dump_rewind() to initialize the iterator. All this is in preparation for removal of @logbuf_lock. Signed-off-by: John Ogness <> Reviewed-by: Kees Cook <> # pstore Reviewed-by: Petr Mladek <> Signed-off-by: Petr Mladek <> Link:
Diffstat (limited to 'drivers/hv')
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 10dce9f91216..b341b144bde8 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1391,6 +1391,7 @@ static void vmbus_isr(void)
static void hv_kmsg_dump(struct kmsg_dumper *dumper,
enum kmsg_dump_reason reason)
+ struct kmsg_dump_iter iter;
size_t bytes_written;
phys_addr_t panic_pa;
@@ -1404,7 +1405,8 @@ static void hv_kmsg_dump(struct kmsg_dumper *dumper,
* Write dump contents to the page. No need to synchronize; panic should
* be single-threaded.
- kmsg_dump_get_buffer(dumper, false, hv_panic_page, HV_HYP_PAGE_SIZE,
+ kmsg_dump_rewind(&iter);
+ kmsg_dump_get_buffer(&iter, false, hv_panic_page, HV_HYP_PAGE_SIZE,
if (bytes_written)
hyperv_report_panic_msg(panic_pa, bytes_written);