The patch titled
Subject: sparc64: define untagged_addr()
has been added to the -mm tree. Its filename is
sparc64-define-untagged_addr.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/sparc64-define-untagged_addr.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/sparc64-define-untagged_addr.patch
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------------------------------------------------------
From: Christoph Hellwig <hch@xxxxxx>
Subject: sparc64: define untagged_addr()
Add a helper to untag a user pointer. This is needed for ADI support
in get_user_pages_fast.
Link: http://lkml.kernel.org/r/20190625143715.1689-9-hch@xxxxxx
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Khalid Aziz <khalid.aziz@xxxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: James Hogan <jhogan@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/sparc/include/asm/pgtable_64.h | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
--- a/arch/sparc/include/asm/pgtable_64.h~sparc64-define-untagged_addr
+++ a/arch/sparc/include/asm/pgtable_64.h
@@ -1076,6 +1076,28 @@ static inline int io_remap_pfn_range(str
}
#define io_remap_pfn_range io_remap_pfn_range
+static inline unsigned long untagged_addr(unsigned long start)
+{
+ if (adi_capable()) {
+ long addr = start;
+
+ /* If userspace has passed a versioned address, kernel
+ * will not find it in the VMAs since it does not store
+ * the version tags in the list of VMAs. Storing version
+ * tags in list of VMAs is impractical since they can be
+ * changed any time from userspace without dropping into
+ * kernel. Any address search in VMAs will be done with
+ * non-versioned addresses. Ensure the ADI version bits
+ * are dropped here by sign extending the last bit before
+ * ADI bits. IOMMU does not implement version tags.
+ */
+ return (addr << (long)adi_nbits()) >> (long)adi_nbits();
+ }
+
+ return start;
+}
+#define untagged_addr untagged_addr
+
#include <asm/tlbflush.h>
#include <asm-generic/pgtable.h>
_
Patches currently in -mm which might be from hch@xxxxxx are
mm-remove-the-account_page_dirtied-export.patch
mm-fix-an-overly-long-line-in-read_cache_page.patch
mm-dont-cast-readpage-to-filler_t-for-do_read_cache_page.patch
jffs2-pass-the-correct-prototype-to-read_cache_page.patch
9p-pass-the-correct-prototype-to-read_cache_page.patch
mm-use-untagged_addr-for-get_user_pages_fast-addresses.patch
mm-simplify-gup_fast_permitted.patch
mm-lift-the-x86_32-pae-version-of-gup_get_pte-to-common-code.patch
mips-use-the-generic-get_user_pages_fast-code.patch
sh-add-the-missing-pud_page-definition.patch
sh-use-the-generic-get_user_pages_fast-code.patch
sparc64-add-the-missing-pgd_page-definition.patch
sparc64-define-untagged_addr.patch
sparc64-use-the-generic-get_user_pages_fast-code.patch
mm-rename-config_have_generic_gup-to-config_have_fast_gup.patch
mm-reorder-code-blocks-in-gupc.patch
mm-consolidate-the-get_user_pages-implementations.patch
mm-validate-get_user_pages_fast-flags.patch
mm-move-the-powerpc-hugepd-code-to-mm-gupc.patch
mm-switch-gup_hugepte-to-use-try_get_compound_head.patch
mm-mark-the-page-referenced-in-gup_hugepte.patch
