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x86/mm: introduce __set_memory_prot()

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For use in the 32bit arch_add_memory() to set the pgprot type of the
memory to add.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Hildenbrand <david@redhat.com>
Cc: Eric Badger <ebadger@gigaio.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Will Deacon <will@kernel.org>
Link: http://lkml.kernel.org/r/20200306170846.9333-5-logang@deltatee.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Logan Gunthorpe 2020-04-10 14:33:28 -07:00 committed by Linus Torvalds
parent c164fbb40c
commit 30796e18c2
2 changed files with 14 additions and 0 deletions
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1
arch/x86/include/asm/set_memory.h
View File

@ -34,6 +34,7 @@
* The caller is required to take care of these.
*/
int __set_memory_prot(unsigned long addr, int numpages, pgprot_t prot);
int _set_memory_uc(unsigned long addr, int numpages);
int _set_memory_wc(unsigned long addr, int numpages);
int _set_memory_wt(unsigned long addr, int numpages);

13
arch/x86/mm/pat/set_memory.c
View File

@ -1795,6 +1795,19 @@ static inline int cpa_clear_pages_array(struct page **pages, int numpages,
CPA_PAGES_ARRAY, pages);
}
/*
* _set_memory_prot is an internal helper for callers that have been passed
* a pgprot_t value from upper layers and a reservation has already been taken.
* If you want to set the pgprot to a specific page protocol, use the
* set_memory_xx() functions.
*/
int __set_memory_prot(unsigned long addr, int numpages, pgprot_t prot)
{
return change_page_attr_set_clr(&addr, numpages, prot,
__pgprot(~pgprot_val(prot)), 0, 0,
NULL);
}
int _set_memory_uc(unsigned long addr, int numpages)
{
/*