powerpc used to set the pte specific flags in set_pte_at(). This is
different from other architectures. To be consistent with other
architecture powerpc updated pfn_pte to set _PAGE_PTE with
commit 379c926d6334 ("powerpc/mm: move setting pte specific flags to pfn_pte")
The commit didn't do the same w.r.t pfn_pmd because we expect pmd_mkhuge
to do that. But as per Linus that is a bad rule [1].
Hence update pfn_pmd to set _PAGE_PTE.
[1]
" The rule that you must use "pmd_mkhuge()" seems _completely_ wrong.
It's insane. The only valid use to ever make a pmd out of a pfn is to
make a huge-page."
message-id: CAHk-=whG+Z2mBFTT026PZAdjn=gSsLk9bk0wnYJ5peyuVGfwyg@xxxxxxxxxxxxxx
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
---
arch/powerpc/include/asm/book3s/64/pgtable.h | 17 ++++++++++++++++-
arch/powerpc/mm/book3s64/pgtable.c | 8 +++++++-
2 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index cd3feeac6e87..a39886681629 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -1231,13 +1231,28 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
return hash__pmd_same(pmd_a, pmd_b);
}
-static inline pmd_t pmd_mkhuge(pmd_t pmd)
+static inline pmd_t __pmd_mkhuge(pmd_t pmd)
{
if (radix_enabled())
return radix__pmd_mkhuge(pmd);
return hash__pmd_mkhuge(pmd);
}
+/*
+ * pfn_pmd return a pmd_t that can be used as pmd pte entry.
+ */
+static inline pmd_t pmd_mkhuge(pmd_t pmd)
+{
+#ifdef CONFIG_DEBUG_VM
+ if (radix_enabled())
+ WARN_ON((pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE)) == 0);
+ else
+ WARN_ON((pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE | H_PAGE_THP_HUGE)) !=
+ cpu_to_be64(_PAGE_PTE | H_PAGE_THP_HUGE));
+#endif
+ return pmd;
+}
+
#define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
extern int pmdp_set_access_flags(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp,
diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
index e18ae50a275c..5b3a3bae21aa 100644
--- a/arch/powerpc/mm/book3s64/pgtable.c
+++ b/arch/powerpc/mm/book3s64/pgtable.c
@@ -136,12 +136,18 @@ static pmd_t pmd_set_protbits(pmd_t pmd, pgprot_t pgprot)
return __pmd(pmd_val(pmd) | pgprot_val(pgprot));
}
+/*
+ * At some point we should be able to get rid of
+ * pmd_mkhuge() and mk_huge_pmd() when we update all the
+ * other archs to mark the pmd huge in pfn_pmd()
+ */
pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot)
{
unsigned long pmdv;
pmdv = (pfn << PAGE_SHIFT) & PTE_RPN_MASK;
- return pmd_set_protbits(__pmd(pmdv), pgprot);
+
+ return __pmd_mkhuge(pmd_set_protbits(__pmd(pmdv), pgprot));
}
pmd_t mk_pmd(struct page *page, pgprot_t pgprot)
--
2.26.2
