linux-kernel - [PATCH 4.19 031/114] of: fix clang -Wunsequenced for be32_to

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Date:   Thu, 23 May 2019 21:05:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Phong Tran <tranmanphong@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        David Laight <David.Laight@...LAB.COM>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH 4.19 031/114] of: fix clang -Wunsequenced for be32_to_cpu()

From: Phong Tran <tranmanphong@...il.com>

commit 440868661f36071886ed360d91de83bd67c73b4f upstream.

Now, make the loop explicit to avoid clang warning.

./include/linux/of.h:238:37: warning: multiple unsequenced modifications
to 'cell' [-Wunsequenced]
                r = (r << 32) | be32_to_cpu(*(cell++));
                                                  ^~
./include/linux/byteorder/generic.h:95:21: note: expanded from macro
'be32_to_cpu'
                    ^
./include/uapi/linux/byteorder/little_endian.h:40:59: note: expanded
from macro '__be32_to_cpu'
                                                          ^
./include/uapi/linux/swab.h:118:21: note: expanded from macro '__swab32'
        ___constant_swab32(x) :                 \
                           ^
./include/uapi/linux/swab.h:18:12: note: expanded from macro
'___constant_swab32'
        (((__u32)(x) & (__u32)0x000000ffUL) << 24) |            \
                  ^

Signed-off-by: Phong Tran <tranmanphong@...il.com>
Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/460
Suggested-by: David Laight <David.Laight@...LAB.COM>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: stable@...r.kernel.org
[robh: fix up whitespace]
Signed-off-by: Rob Herring <robh@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/linux/of.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -236,8 +236,8 @@ extern struct device_node *of_find_all_n
 static inline u64 of_read_number(const __be32 *cell, int size)
 {
 	u64 r = 0;
-	while (size--)
-		r = (r << 32) | be32_to_cpu(*(cell++));
+	for (; size--; cell++)
+		r = (r << 32) | be32_to_cpu(*cell);
 	return r;
 }