The patch titled
Subject: x86/mm: introduce __set_memory_prot()
has been added to the -mm tree. Its filename is
x86-mm-introduce-__set_memory_prot.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/x86-mm-introduce-__set_memory_prot.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/x86-mm-introduce-__set_memory_prot.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Subject: x86/mm: introduce __set_memory_prot()
For use in the 32bit arch_add_memory() to set the pgprot type of the
memory to add.
Link: http://lkml.kernel.org/r/20200306170846.9333-5-logang@xxxxxxxxxxxx
Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Eric Badger <ebadger@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/set_memory.h | 1 +
arch/x86/mm/pat/set_memory.c | 13 +++++++++++++
2 files changed, 14 insertions(+)
--- a/arch/x86/include/asm/set_memory.h~x86-mm-introduce-__set_memory_prot
+++ a/arch/x86/include/asm/set_memory.h
@@ -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);
--- a/arch/x86/mm/pat/set_memory.c~x86-mm-introduce-__set_memory_prot
+++ a/arch/x86/mm/pat/set_memory.c
@@ -1792,6 +1792,19 @@ static inline int cpa_clear_pages_array(
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)
{
/*
_
Patches currently in -mm which might be from logang@xxxxxxxxxxxx are
mm-memory_hotplug-drop-the-flags-field-from-struct-mhp_restrictions.patch
mm-memory_hotplug-rename-mhp_restrictions-to-mhp_params.patch
x86-mm-thread-pgprot_t-through-init_memory_mapping.patch
x86-mm-introduce-__set_memory_prot.patch
powerpc-mm-thread-pgprot_t-through-create_section_mapping.patch
mm-memory_hotplug-add-pgprot_t-to-mhp_params.patch
mm-memremap-set-caching-mode-for-pci-p2pdma-memory-to-wc.patch
