| Message ID | 20170328065033.15966-1-takahiro.akashi@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 28 March 2017 at 07:50, AKASHI Takahiro <takahiro.akashi@linaro.org> wrote: > This function, with a combination of memblock_mark_nomap(), will be used > in a later kdump patch for arm64 when it temporarily isolates some range > of memory from the other memory blocks in order to create a specific > kernel mapping at boot time. > > Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> > --- > include/linux/memblock.h | 1 + > mm/memblock.c | 12 ++++++++++++ > 2 files changed, 13 insertions(+) > > diff --git a/include/linux/memblock.h b/include/linux/memblock.h > index bdfc65af4152..e82daffcfc44 100644 > --- a/include/linux/memblock.h > +++ b/include/linux/memblock.h > @@ -93,6 +93,7 @@ int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); > int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); > int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); > int memblock_mark_nomap(phys_addr_t base, phys_addr_t size); > +int memblock_clear_nomap(phys_addr_t base, phys_addr_t size); > ulong choose_memblock_flags(void); > > /* Low level functions */ > diff --git a/mm/memblock.c b/mm/memblock.c > index 696f06d17c4e..2f4ca8104ea4 100644 > --- a/mm/memblock.c > +++ b/mm/memblock.c > @@ -805,6 +805,18 @@ int __init_memblock memblock_mark_nomap(phys_addr_t base, phys_addr_t size) > } > > /** > + * memblock_clear_nomap - Clear flag MEMBLOCK_NOMAP for a specified region. > + * @base: the base phys addr of the region > + * @size: the size of the region > + * > + * Return 0 on success, -errno on failure. > + */ > +int __init_memblock memblock_clear_nomap(phys_addr_t base, phys_addr_t size) > +{ > + return memblock_setclr_flag(base, size, 0, MEMBLOCK_NOMAP); > +} > + > +/** > * __next_reserved_mem_region - next function for for_each_reserved_region() > * @idx: pointer to u64 loop variable > * @out_start: ptr to phys_addr_t for start address of the region, can be %NULL > -- > 2.11.1 >
diff --git a/include/linux/memblock.h b/include/linux/memblock.h index bdfc65af4152..e82daffcfc44 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -93,6 +93,7 @@ int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); int memblock_mark_nomap(phys_addr_t base, phys_addr_t size); +int memblock_clear_nomap(phys_addr_t base, phys_addr_t size); ulong choose_memblock_flags(void); /* Low level functions */ diff --git a/mm/memblock.c b/mm/memblock.c index 696f06d17c4e..2f4ca8104ea4 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -805,6 +805,18 @@ int __init_memblock memblock_mark_nomap(phys_addr_t base, phys_addr_t size) } /** + * memblock_clear_nomap - Clear flag MEMBLOCK_NOMAP for a specified region. + * @base: the base phys addr of the region + * @size: the size of the region + * + * Return 0 on success, -errno on failure. + */ +int __init_memblock memblock_clear_nomap(phys_addr_t base, phys_addr_t size) +{ + return memblock_setclr_flag(base, size, 0, MEMBLOCK_NOMAP); +} + +/** * __next_reserved_mem_region - next function for for_each_reserved_region() * @idx: pointer to u64 loop variable * @out_start: ptr to phys_addr_t for start address of the region, can be %NULL
This function, with a combination of memblock_mark_nomap(), will be used in a later kdump patch for arm64 when it temporarily isolates some range of memory from the other memory blocks in order to create a specific kernel mapping at boot time. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> --- include/linux/memblock.h | 1 + mm/memblock.c | 12 ++++++++++++ 2 files changed, 13 insertions(+)