Re: [PATCH] x86: Remove register_nosave_region_late()

From: Rafael J. Wysocki
Date: Tue Jan 25 2022 - 12:37:01 EST


On Wed, Jan 19, 2022 at 11:48 AM Amadeusz Sławiński
<amadeuszx.slawinski@xxxxxxxxxxxxxxx> wrote:
>
> It is an unused wrapper forcing kmalloc allocation for registering
> nosave regions. Also, rename __register_nosave_region() to
> register_nosave_region() now that there is no need for disambiguation.
>
> Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@xxxxxxxxxxxxxxx>
> Reviewed-by: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
> ---
> include/linux/suspend.h | 11 +----------
> kernel/power/snapshot.c | 21 +++++++--------------
> 2 files changed, 8 insertions(+), 24 deletions(-)
>
> diff --git a/include/linux/suspend.h b/include/linux/suspend.h
> index 5785d909c321..3e8ecdebe601 100644
> --- a/include/linux/suspend.h
> +++ b/include/linux/suspend.h
> @@ -430,15 +430,7 @@ struct platform_hibernation_ops {
>
> #ifdef CONFIG_HIBERNATION
> /* kernel/power/snapshot.c */
> -extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
> -static inline void __init register_nosave_region(unsigned long b, unsigned long e)
> -{
> - __register_nosave_region(b, e, 0);
> -}
> -static inline void __init register_nosave_region_late(unsigned long b, unsigned long e)
> -{
> - __register_nosave_region(b, e, 1);
> -}
> +extern void register_nosave_region(unsigned long b, unsigned long e);
> extern int swsusp_page_is_forbidden(struct page *);
> extern void swsusp_set_page_free(struct page *);
> extern void swsusp_unset_page_free(struct page *);
> @@ -458,7 +450,6 @@ int pfn_is_nosave(unsigned long pfn);
> int hibernate_quiet_exec(int (*func)(void *data), void *data);
> #else /* CONFIG_HIBERNATION */
> static inline void register_nosave_region(unsigned long b, unsigned long e) {}
> -static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
> static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
> static inline void swsusp_set_page_free(struct page *p) {}
> static inline void swsusp_unset_page_free(struct page *p) {}
> diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
> index f7a986078213..330d49937692 100644
> --- a/kernel/power/snapshot.c
> +++ b/kernel/power/snapshot.c
> @@ -978,8 +978,7 @@ static void memory_bm_recycle(struct memory_bitmap *bm)
> * Register a range of page frames the contents of which should not be saved
> * during hibernation (to be used in the early initialization code).
> */
> -void __init __register_nosave_region(unsigned long start_pfn,
> - unsigned long end_pfn, int use_kmalloc)
> +void __init register_nosave_region(unsigned long start_pfn, unsigned long end_pfn)
> {
> struct nosave_region *region;
>
> @@ -995,18 +994,12 @@ void __init __register_nosave_region(unsigned long start_pfn,
> goto Report;
> }
> }
> - if (use_kmalloc) {
> - /* During init, this shouldn't fail */
> - region = kmalloc(sizeof(struct nosave_region), GFP_KERNEL);
> - BUG_ON(!region);
> - } else {
> - /* This allocation cannot fail */
> - region = memblock_alloc(sizeof(struct nosave_region),
> - SMP_CACHE_BYTES);
> - if (!region)
> - panic("%s: Failed to allocate %zu bytes\n", __func__,
> - sizeof(struct nosave_region));
> - }
> + /* This allocation cannot fail */
> + region = memblock_alloc(sizeof(struct nosave_region),
> + SMP_CACHE_BYTES);
> + if (!region)
> + panic("%s: Failed to allocate %zu bytes\n", __func__,
> + sizeof(struct nosave_region));
> region->start_pfn = start_pfn;
> region->end_pfn = end_pfn;
> list_add_tail(&region->list, &nosave_regions);
> --

Applied as 5.18 material, thanks!