linux-kernel - [PATCH 02/10] powerpc/uaccess: Also perform 64 bits copies in unsafe_copy_from

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Message-Id: <308e65d9237a14e8c0e3b22919fcf0b5e5592608.1616151715.git.christophe.leroy@csgroup.eu>
Date:   Fri, 19 Mar 2021 11:06:51 +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>, cmr@...efail.de
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 02/10] powerpc/uaccess: Also perform 64 bits copies in
 unsafe_copy_from_user() on ppc32

Similarly to commit 5cf773fc8f37 ("powerpc/uaccess: Also perform
64 bits copies in unsafe_copy_to_user() on ppc32")

ppc32 has an efficiant 64 bits unsafe_get_user(), so also use it in
order to unroll loops more.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/include/asm/uaccess.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 77d837b16e4d..a4e791bcd3fe 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -432,9 +432,9 @@ do {											\
 	size_t _len = (l);								\
 	int _i;										\
 											\
-	for (_i = 0; _i < (_len & ~(sizeof(long) - 1)); _i += sizeof(long))		\
-		unsafe_get_user(*(long *)(_dst + _i), (long __user *)(_src + _i), e);	\
-	if (IS_ENABLED(CONFIG_PPC64) && (_len & 4)) {					\
+	for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64))		\
+		unsafe_get_user(*(u64 *)(_dst + _i), (u64 __user *)(_src + _i), e);	\
+	if (_len & 4) {									\
 		unsafe_get_user(*(u32 *)(_dst + _i), (u32 __user *)(_src + _i), e);	\
 		_i += 4;								\
 	}										\
-- 
2.25.0