linux-kernel - [PATCH v2] selftests/vDSO: Fix assignment in condition without parentheses

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Date: Wed,  1 May 2024 00:21:48 +0000
From: Edward Liaw <edliaw@...gle.com>
To: linux-kernel@...r.kernel.org, Shuah Khan <shuah@...nel.org>, 
	Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, 
	Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
	Andy Lutomirski <luto@....edu>, "H. Peter Anvin" <hpa@...ux.intel.com>
Cc: linux-kselftest@...r.kernel.org, kernel-team@...roid.com, 
	Edward Liaw <edliaw@...gle.com>, llvm@...ts.linux.dev
Subject: [PATCH v2] selftests/vDSO: Fix assignment in condition without parentheses

Fixes clang compiler warnings by adding parentheses:

parse_vdso.c:65:9: warning: using the result of an assignment as a
 condition without parentheses [-Wparentheses]
                if (g = h & 0xf0000000)
                    ~~^~~~~~~~~~~~~~~~
parse_vdso.c:65:9: note: place parentheses around the assignment to
 silence this warning
                if (g = h & 0xf0000000)
                      ^
                    (                 )
parse_vdso.c:65:9: note: use '==' to turn this assignment into an
 equality comparison
                if (g = h & 0xf0000000)
                      ^
                      ==

Fixes: 98eedc3a9dbf ("Document the vDSO and add a reference parser")
Reviewed-by: Justin Stitt <justinstitt@...gle.com>
Signed-off-by: Edward Liaw <edliaw@...gle.com>
---
v2: separated assignment from predicate
---
 tools/testing/selftests/vDSO/parse_vdso.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/vDSO/parse_vdso.c b/tools/testing/selftests/vDSO/parse_vdso.c
index 413f75620a35..fdd38f7e0e43 100644
--- a/tools/testing/selftests/vDSO/parse_vdso.c
+++ b/tools/testing/selftests/vDSO/parse_vdso.c
@@ -62,7 +62,8 @@ static unsigned long elf_hash(const unsigned char *name)
 	while (*name)
 	{
 		h = (h << 4) + *name++;
-		if (g = h & 0xf0000000)
+		g = h & 0xf0000000;
+		if (g)
 			h ^= g >> 24;
 		h &= ~g;
 	}
--
2.45.0.rc0.197.gbae5840b3b-goog