linux-kernel - [PATCH v2 12/12] powerpc/kuap: Remove to/from/size parameters of prevent_user

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Date:   Thu,  3 Jun 2021 08:41:48 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 12/12] powerpc/kuap: Remove to/from/size parameters of
 prevent_user_access()

prevent_user_access() doesn't use anymore to/from/size parameters.

Remove them.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/include/asm/book3s/32/kup.h     |  3 +--
 arch/powerpc/include/asm/book3s/64/kup.h     |  3 +--
 arch/powerpc/include/asm/kup.h               | 15 +++++++--------
 arch/powerpc/include/asm/nohash/32/kup-8xx.h |  3 +--
 4 files changed, 10 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h
index eb5ef59a406b..64201125a287 100644
--- a/arch/powerpc/include/asm/book3s/32/kup.h
+++ b/arch/powerpc/include/asm/book3s/32/kup.h
@@ -153,8 +153,7 @@ static __always_inline void allow_user_access(void __user *to, const void __user
 	kuap_unlock_one((__force u32)to);
 }
 
-static __always_inline void prevent_user_access(void __user *to, const void __user *from,
-						u32 size, unsigned long dir)
+static __always_inline void prevent_user_access(unsigned long dir)
 {
 	u32 kuap = current->thread.kuap;
 
diff --git a/arch/powerpc/include/asm/book3s/64/kup.h b/arch/powerpc/include/asm/book3s/64/kup.h
index 9700da3a4093..a1cc73a88710 100644
--- a/arch/powerpc/include/asm/book3s/64/kup.h
+++ b/arch/powerpc/include/asm/book3s/64/kup.h
@@ -398,8 +398,7 @@ static __always_inline void allow_user_access(void __user *to, const void __user
 
 #endif /* !CONFIG_PPC_KUAP */
 
-static inline void prevent_user_access(void __user *to, const void __user *from,
-				       unsigned long size, unsigned long dir)
+static inline void prevent_user_access(unsigned long dir)
 {
 	set_kuap(AMR_KUAP_BLOCKED);
 	if (static_branch_unlikely(&uaccess_flush_key))
diff --git a/arch/powerpc/include/asm/kup.h b/arch/powerpc/include/asm/kup.h
index 2c47feee9482..0202a7e84a49 100644
--- a/arch/powerpc/include/asm/kup.h
+++ b/arch/powerpc/include/asm/kup.h
@@ -72,8 +72,7 @@ static inline unsigned long kuap_get_and_assert_locked(void)
 #ifndef CONFIG_PPC_BOOK3S_64
 static inline void allow_user_access(void __user *to, const void __user *from,
 				     unsigned long size, unsigned long dir) { }
-static inline void prevent_user_access(void __user *to, const void __user *from,
-				       unsigned long size, unsigned long dir) { }
+static inline void prevent_user_access(unsigned long dir) { }
 static inline unsigned long prevent_user_access_return(void) { return 0UL; }
 static inline void restore_user_access(unsigned long flags) { }
 #endif /* CONFIG_PPC_BOOK3S_64 */
@@ -105,33 +104,33 @@ static inline void allow_read_write_user(void __user *to, const void __user *fro
 
 static inline void prevent_read_from_user(const void __user *from, unsigned long size)
 {
-	prevent_user_access(NULL, from, size, KUAP_READ);
+	prevent_user_access(KUAP_READ);
 }
 
 static inline void prevent_write_to_user(void __user *to, unsigned long size)
 {
-	prevent_user_access(to, NULL, size, KUAP_WRITE);
+	prevent_user_access(KUAP_WRITE);
 }
 
 static inline void prevent_read_write_user(void __user *to, const void __user *from,
 					   unsigned long size)
 {
-	prevent_user_access(to, from, size, KUAP_READ_WRITE);
+	prevent_user_access(KUAP_READ_WRITE);
 }
 
 static inline void prevent_current_access_user(void)
 {
-	prevent_user_access(NULL, NULL, ~0UL, KUAP_READ_WRITE);
+	prevent_user_access(KUAP_READ_WRITE);
 }
 
 static inline void prevent_current_read_from_user(void)
 {
-	prevent_user_access(NULL, NULL, ~0UL, KUAP_READ);
+	prevent_user_access(KUAP_READ);
 }
 
 static inline void prevent_current_write_to_user(void)
 {
-	prevent_user_access(NULL, NULL, ~0UL, KUAP_WRITE);
+	prevent_user_access(KUAP_WRITE);
 }
 
 #endif /* !__ASSEMBLY__ */
diff --git a/arch/powerpc/include/asm/nohash/32/kup-8xx.h b/arch/powerpc/include/asm/nohash/32/kup-8xx.h
index 295ef5639609..61333e3b5d2b 100644
--- a/arch/powerpc/include/asm/nohash/32/kup-8xx.h
+++ b/arch/powerpc/include/asm/nohash/32/kup-8xx.h
@@ -48,8 +48,7 @@ static inline void allow_user_access(void __user *to, const void __user *from,
 	mtspr(SPRN_MD_AP, MD_APG_INIT);
 }
 
-static inline void prevent_user_access(void __user *to, const void __user *from,
-				       unsigned long size, unsigned long dir)
+static inline void prevent_user_access(unsigned long dir)
 {
 	mtspr(SPRN_MD_AP, MD_APG_KUAP);
 }
-- 
2.25.0