list_bl would crash with BUG() if we used it without locking. dm-snapshot uses its own locking on realtime kernels (it can't use list_bl because list_bl uses raw spinlock and dm-snapshot takes other non-raw spinlocks while holding bl_lock).
To avoid this BUG we deactivate the list debug checks for list_bl on realtime kernels. This patch is intended only for the realtime kernel patchset, not for the upstream kernel. Signed-off-by: Nikos Tsironis <[email protected]> Reviewed-by: Mikulas Patocka <[email protected]> --- include/linux/list_bl.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/list_bl.h b/include/linux/list_bl.h index da38433240f5..3585b2f6b948 100644 --- a/include/linux/list_bl.h +++ b/include/linux/list_bl.h @@ -25,7 +25,7 @@ #define LIST_BL_LOCKMASK 0UL #endif -#ifdef CONFIG_DEBUG_LIST +#if defined(CONFIG_DEBUG_LIST) && !defined(CONFIG_PREEMPT_RT_BASE) #define LIST_BL_BUG_ON(x) BUG_ON(x) #else #define LIST_BL_BUG_ON(x) -- 2.11.0 -- dm-devel mailing list [email protected] https://www.redhat.com/mailman/listinfo/dm-devel
