linux-kernel - [PATCH v2 05/16] powerpc/kuap: Remove __kuap_assert

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Date:   Fri,  8 Oct 2021 17:40:33 +0200
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:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 05/16] powerpc/kuap: Remove __kuap_assert_locked()

__kuap_assert_locked() is redundant with
__kuap_get_and_assert_locked().

Move the verification of CONFIG_PPC_KUAP_DEBUG in kuap_assert_locked()
and make it call __kuap_get_and_assert_locked() directly.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/include/asm/book3s/32/kup.h     | 5 -----
 arch/powerpc/include/asm/book3s/64/kup.h     | 6 ------
 arch/powerpc/include/asm/kup.h               | 3 ++-
 arch/powerpc/include/asm/nohash/32/kup-8xx.h | 6 ------
 4 files changed, 2 insertions(+), 18 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h
index f1617ba85068..e273a6d3b6ad 100644
--- a/arch/powerpc/include/asm/book3s/32/kup.h
+++ b/arch/powerpc/include/asm/book3s/32/kup.h
@@ -120,11 +120,6 @@ static inline unsigned long __kuap_get_and_assert_locked(void)
 	return kuap;
 }
 
-static inline void __kuap_assert_locked(void)
-{
-	__kuap_get_and_assert_locked();
-}
-
 static __always_inline void __allow_user_access(void __user *to, const void __user *from,
 						u32 size, unsigned long dir)
 {
diff --git a/arch/powerpc/include/asm/book3s/64/kup.h b/arch/powerpc/include/asm/book3s/64/kup.h
index 9f2099790658..503828709d55 100644
--- a/arch/powerpc/include/asm/book3s/64/kup.h
+++ b/arch/powerpc/include/asm/book3s/64/kup.h
@@ -298,12 +298,6 @@ static inline unsigned long __kuap_get_and_assert_locked(void)
 	return amr;
 }
 
-static inline void __kuap_assert_locked(void)
-{
-	if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
-		WARN_ON_ONCE(mfspr(SPRN_AMR) != AMR_KUAP_BLOCKED);
-}
-
 /*
  * We support individually allowing read or write, but we don't support nesting
  * because that would require an expensive read/modify write of the AMR.
diff --git a/arch/powerpc/include/asm/kup.h b/arch/powerpc/include/asm/kup.h
index ea70e6f1df1e..7f0d614c5b8b 100644
--- a/arch/powerpc/include/asm/kup.h
+++ b/arch/powerpc/include/asm/kup.h
@@ -89,7 +89,8 @@ static __always_inline void kuap_assert_locked(void)
 	if (kuap_is_disabled())
 		return;
 
-	__kuap_assert_locked();
+	if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
+		__kuap_get_and_assert_locked();
 }
 
 #ifdef CONFIG_PPC32
diff --git a/arch/powerpc/include/asm/nohash/32/kup-8xx.h b/arch/powerpc/include/asm/nohash/32/kup-8xx.h
index 74f15c386476..37fe4b32b658 100644
--- a/arch/powerpc/include/asm/nohash/32/kup-8xx.h
+++ b/arch/powerpc/include/asm/nohash/32/kup-8xx.h
@@ -47,12 +47,6 @@ static inline unsigned long __kuap_get_and_assert_locked(void)
 	return kuap;
 }
 
-static inline void __kuap_assert_locked(void)
-{
-	if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
-		__kuap_get_and_assert_locked();
-}
-
 static inline void __allow_user_access(void __user *to, const void __user *from,
 				       unsigned long size, unsigned long dir)
 {
-- 
2.31.1