From: Edward Liaw <edliaw@google.com>
To: linux-kernel@vger.kernel.org, Shuah Khan <shuah@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
"H. Peter Anvin" <hpa@linux.intel.com>,
Andy Lutomirski <luto@mit.edu>
Cc: linux-kselftest@vger.kernel.org, kernel-team@android.com,
Edward Liaw <edliaw@google.com>,
llvm@lists.linux.dev
Subject: [PATCH v3] selftests/vDSO: Explicit unsigned char conversion for elf_hash
Date: Wed, 1 May 2024 18:06:18 +0000 [thread overview]
Message-ID: <20240501180622.1676340-1-edliaw@google.com> (raw)
Fixes clang compilation warnings by adding explicit unsigned conversion:
parse_vdso.c:206:22: warning: passing 'const char *' to parameter of
type 'const unsigned char *' converts between pointers to integer types
where one is of the unique plain 'char' type and the other is not
[-Wpointer-sign]
ver_hash = elf_hash(version);
^~~~~~~
parse_vdso.c:59:52: note: passing argument to parameter 'name' here
static unsigned long elf_hash(const unsigned char *name)
^
parse_vdso.c:207:46: warning: passing 'const char *' to parameter of
type 'const unsigned char *' converts between pointers to integer types
where one is of the unique plain 'char' type and the other is not
[-Wpointer-sign]
ELF(Word) chain = vdso_info.bucket[elf_hash(name) % vdso_info.nbucket];
^~~~
parse_vdso.c:59:52: note: passing argument to parameter 'name' here
static unsigned long elf_hash(const unsigned char *name)
Fixes: 98eedc3a9dbf ("Document the vDSO and add a reference parser")
Signed-off-by: Edward Liaw <edliaw@google.com>
---
v2: update commit message with correct compiler warning
v3: fix checkpatch errors and indentation
---
tools/testing/selftests/vDSO/parse_vdso.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/vDSO/parse_vdso.c b/tools/testing/selftests/vDSO/parse_vdso.c
index 413f75620a35..9e29ff0657ea 100644
--- a/tools/testing/selftests/vDSO/parse_vdso.c
+++ b/tools/testing/selftests/vDSO/parse_vdso.c
@@ -203,8 +203,9 @@ void *vdso_sym(const char *version, const char *name)
if (!vdso_info.valid)
return 0;
- ver_hash = elf_hash(version);
- ELF(Word) chain = vdso_info.bucket[elf_hash(name) % vdso_info.nbucket];
+ ver_hash = elf_hash((const unsigned char *)version);
+ ELF(Word) chain = vdso_info.bucket[
+ elf_hash((const unsigned char *)name) % vdso_info.nbucket];
for (; chain != STN_UNDEF; chain = vdso_info.chain[chain]) {
ELF(Sym) *sym = &vdso_info.symtab[chain];
--
2.45.0.rc0.197.gbae5840b3b-goog
next reply other threads:[~2024-05-01 18:06 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-01 18:06 Edward Liaw [this message]
2024-05-01 19:54 ` [PATCH v3] selftests/vDSO: Explicit unsigned char conversion for elf_hash Justin Stitt
2024-05-01 20:21 ` Edward Liaw
2024-05-05 13:20 ` David Laight
2024-05-06 17:16 ` Justin Stitt
2024-05-06 17:34 ` Edward Liaw
2024-05-06 19:31 ` David Laight
2024-05-06 23:10 ` Edward Liaw
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