[PATCH v7 1/7] powerpc: mm: Separate set_pte, set_pte_at for internal, external use

[Rohan McLure]

Produce separate symbols for set_pte, which is to be used in
arch/powerpc for reassignment of pte's, and set_pte_at, used in generic
code.

The reason for this distinction is to support the Page Table Check
sanitiser. Having this distinction allows for set_pte_at to
instrumented, but set_pte not to be, permitting for uninstrumented
internal mappings. This distinction in names is also present in x86.

Signed-off-by: Rohan McLure <rmclure at linux.ibm.com>
---
v6: new patch
v7: Remove extern, move set_pte args to be in a single line.
---
 arch/powerpc/include/asm/book3s/pgtable.h | 3 +--
 arch/powerpc/include/asm/nohash/pgtable.h | 3 +--
 arch/powerpc/include/asm/pgtable.h        | 1 +
 arch/powerpc/mm/pgtable.c                 | 3 +--
 4 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/pgtable.h b/arch/powerpc/include/asm/book3s/pgtable.h
index d18b748ea3ae..1386ed705e66 100644
--- a/arch/powerpc/include/asm/book3s/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/pgtable.h
@@ -12,8 +12,7 @@
 /* Insert a PTE, top-level function is out of line. It uses an inline
  * low level function in the respective pgtable-* files
  */
-extern void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
-		       pte_t pte);
+void set_pte(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte);
 
 
 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h
index 69c3a050a3d8..f36dd2e2d591 100644
--- a/arch/powerpc/include/asm/nohash/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/pgtable.h
@@ -154,8 +154,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 /* Insert a PTE, top-level function is out of line. It uses an inline
  * low level function in the respective pgtable-* files
  */
-extern void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
-		       pte_t pte);
+void set_pte(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte);
 
 /* This low level function performs the actual PTE insertion
  * Setting the PTE depends on the MMU type and other factors. It's
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 9972626ddaf6..17d30359d1f4 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -48,6 +48,7 @@ struct mm_struct;
 /* Keep these as a macros to avoid include dependency mess */
 #define pte_page(x)		pfn_to_page(pte_pfn(x))
 #define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), (pgprot))
+#define set_pte_at  		set_pte
 /*
  * Select all bits except the pfn
  */
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index cb2dcdb18f8e..d7cce317cef8 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -187,8 +187,7 @@ static pte_t set_access_flags_filter(pte_t pte, struct vm_area_struct *vma,
 /*
  * set_pte stores a linux PTE into the linux page table.
  */
-void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
-		pte_t pte)
+void set_pte(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
 {
 	/*
 	 * Make sure hardware valid bit is not set. We don't do
-- 
2.37.2