linux-kernel - [PATCH 1/4] powerpc32: misuse of accessors to pte

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Date:	Wed, 10 Dec 2014 19:00:33 +0100 (CET)
From:	Christophe Leroy <christophe.leroy@....fr>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>, scottwood@...escale.com
CC:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 1/4] powerpc32: misuse of accessors to pte_t objects

pte_val() is not meant to be used as L value.
__pte() has to be used to assign value to pte_t.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

---
 arch/powerpc/include/asm/pgtable.h | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 316f9a5..5d4fdcc 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -115,24 +115,25 @@ static inline unsigned long pte_pfn(pte_t pte)	{
 
 /* Generic modifiers for PTE bits */
 static inline pte_t pte_wrprotect(pte_t pte) {
-	pte_val(pte) &= ~(_PAGE_RW | _PAGE_HWWRITE); return pte; }
+	pte = __pte(pte_val(pte) & ~(_PAGE_RW | _PAGE_HWWRITE)); return pte; }
 static inline pte_t pte_mkclean(pte_t pte) {
-	pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HWWRITE); return pte; }
+	pte = __pte(pte_val(pte) & ~(_PAGE_DIRTY | _PAGE_HWWRITE));
+	return pte; }
 static inline pte_t pte_mkold(pte_t pte) {
-	pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
+	pte = __pte(pte_val(pte) & ~_PAGE_ACCESSED); return pte; }
 static inline pte_t pte_mkwrite(pte_t pte) {
-	pte_val(pte) |= _PAGE_RW; return pte; }
+	pte = __pte(pte_val(pte) | _PAGE_RW); return pte; }
 static inline pte_t pte_mkdirty(pte_t pte) {
-	pte_val(pte) |= _PAGE_DIRTY; return pte; }
+	pte = __pte(pte_val(pte) | _PAGE_DIRTY); return pte; }
 static inline pte_t pte_mkyoung(pte_t pte) {
-	pte_val(pte) |= _PAGE_ACCESSED; return pte; }
+	pte = __pte(pte_val(pte) | _PAGE_ACCESSED); return pte; }
 static inline pte_t pte_mkspecial(pte_t pte) {
-	pte_val(pte) |= _PAGE_SPECIAL; return pte; }
+	pte = __pte(pte_val(pte) | _PAGE_SPECIAL); return pte; }
 static inline pte_t pte_mkhuge(pte_t pte) {
 	return pte; }
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
-	pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
+	pte = __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 	return pte;
 }
 
-- 
2.1.0

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