On 12/13/2017 01:53 PM, Janosch Frank wrote:
> A shadow gmap and its parent are locked right after each other when
> doing VSIE management. Lockdep can't differentiate between the two
> classes without some help.
>
> TODO: Not sure yet if I have to annotate all and if gmap_pmd_walk will
> be used by both shadow and parent
I think the annotations are just fine here.
>
> Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxxxxxxx>
> ---
> arch/s390/include/asm/gmap.h | 6 ++++++
> arch/s390/mm/gmap.c | 40 +++++++++++++++++++---------------------
> 2 files changed, 25 insertions(+), 21 deletions(-)
>
> diff --git a/arch/s390/include/asm/gmap.h b/arch/s390/include/asm/gmap.h
> index a187033..6287aca 100644
> --- a/arch/s390/include/asm/gmap.h
> +++ b/arch/s390/include/asm/gmap.h
> @@ -20,6 +20,12 @@
> #define _SEGMENT_ENTRY_GMAP_UC 0x4000 /* user dirty (migration) */
> #define _SEGMENT_ENTRY_GMAP_VSIE 0x8000 /* vsie bit */
>
> +
> +enum gmap_lock_class {
> + GMAP_LOCK_PARENT,
> + GMAP_LOCK_SHADOW
> +};
> +
> /**
> * struct gmap_struct - guest address space
> * @list: list head for the mm->context gmap list
> diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
> index cb03646..86a12f3 100644
> --- a/arch/s390/mm/gmap.c
> +++ b/arch/s390/mm/gmap.c
> @@ -199,10 +199,8 @@ static void gmap_free(struct gmap *gmap)
> gmap_radix_tree_free(&gmap->host_to_guest);
>
> /* Free split pmd page tables */
> - spin_lock(&gmap->guest_table_lock);
> list_for_each_entry_safe(page, next, &gmap->split_list, lru)
> page_table_free_pgste(page);
> - spin_unlock(&gmap->guest_table_lock);
Any reason why you only remove these?
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