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SubjectRe: [Patch V6 12/16] mm: provide early_memremap_ro to establish read-only mapping
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MM maintainers,

is it really so hard to comment on this patch?


Juergen

On 07/29/2015 11:20 AM, Juergen Gross wrote:
> On 07/21/2015 06:49 AM, Juergen Gross wrote:
>> Hi MM maintainers,
>>
>> this patch is the last requiring an ack for the series to go in.
>> Could you please comment?
>
> PING?
>
>>
>>
>> Juergen
>>
>> On 07/17/2015 06:51 AM, Juergen Gross wrote:
>>> During early boot as Xen pv domain the kernel needs to map some page
>>> tables supplied by the hypervisor read only. This is needed to be
>>> able to relocate some data structures conflicting with the physical
>>> memory map especially on systems with huge RAM (above 512GB).
>>>
>>> Provide the function early_memremap_ro() to provide this read only
>>> mapping.
>>>
>>> Signed-off-by: Juergen Gross <jgross@suse.com>
>>> Acked-by: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
>>> Cc: Arnd Bergmann <arnd@arndb.de>
>>> Cc: linux-mm@kvack.org
>>> Cc: linux-arch@vger.kernel.org
>>> ---
>>> include/asm-generic/early_ioremap.h | 2 ++
>>> include/asm-generic/fixmap.h | 3 +++
>>> mm/early_ioremap.c | 12 ++++++++++++
>>> 3 files changed, 17 insertions(+)
>>>
>>> diff --git a/include/asm-generic/early_ioremap.h
>>> b/include/asm-generic/early_ioremap.h
>>> index a5de55c..316bd04 100644
>>> --- a/include/asm-generic/early_ioremap.h
>>> +++ b/include/asm-generic/early_ioremap.h
>>> @@ -11,6 +11,8 @@ extern void __iomem *early_ioremap(resource_size_t
>>> phys_addr,
>>> unsigned long size);
>>> extern void *early_memremap(resource_size_t phys_addr,
>>> unsigned long size);
>>> +extern void *early_memremap_ro(resource_size_t phys_addr,
>>> + unsigned long size);
>>> extern void early_iounmap(void __iomem *addr, unsigned long size);
>>> extern void early_memunmap(void *addr, unsigned long size);
>>>
>>> diff --git a/include/asm-generic/fixmap.h b/include/asm-generic/fixmap.h
>>> index f23174f..1cbb833 100644
>>> --- a/include/asm-generic/fixmap.h
>>> +++ b/include/asm-generic/fixmap.h
>>> @@ -46,6 +46,9 @@ static inline unsigned long virt_to_fix(const
>>> unsigned long vaddr)
>>> #ifndef FIXMAP_PAGE_NORMAL
>>> #define FIXMAP_PAGE_NORMAL PAGE_KERNEL
>>> #endif
>>> +#if !defined(FIXMAP_PAGE_RO) && defined(PAGE_KERNEL_RO)
>>> +#define FIXMAP_PAGE_RO PAGE_KERNEL_RO
>>> +#endif
>>> #ifndef FIXMAP_PAGE_NOCACHE
>>> #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE
>>> #endif
>>> diff --git a/mm/early_ioremap.c b/mm/early_ioremap.c
>>> index e10ccd2..0cfadaf 100644
>>> --- a/mm/early_ioremap.c
>>> +++ b/mm/early_ioremap.c
>>> @@ -217,6 +217,13 @@ early_memremap(resource_size_t phys_addr,
>>> unsigned long size)
>>> return (__force void *)__early_ioremap(phys_addr, size,
>>> FIXMAP_PAGE_NORMAL);
>>> }
>>> +#ifdef FIXMAP_PAGE_RO
>>> +void __init *
>>> +early_memremap_ro(resource_size_t phys_addr, unsigned long size)
>>> +{
>>> + return (__force void *)__early_ioremap(phys_addr, size,
>>> FIXMAP_PAGE_RO);
>>> +}
>>> +#endif
>>> #else /* CONFIG_MMU */
>>>
>>> void __init __iomem *
>>> @@ -231,6 +238,11 @@ early_memremap(resource_size_t phys_addr,
>>> unsigned long size)
>>> {
>>> return (void *)phys_addr;
>>> }
>>> +void __init *
>>> +early_memremap_ro(resource_size_t phys_addr, unsigned long size)
>>> +{
>>> + return (void *)phys_addr;
>>> +}
>>>
>>> void __init early_iounmap(void __iomem *addr, unsigned long size)
>>> {
>>>
>>
>> --
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>
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