Commit 30796e18 authored Apr 10, 2020 by Logan Gunthorpe Committed by Linus Torvalds Apr 10, 2020

x86/mm: introduce __set_memory_prot()

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>

parent c164fbb4

arch/x86/include/asm/set_memory.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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);

arch/x86/mm/pat/set_memory.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -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)
		{
		/*

Admin message