From patchwork Mon May 6 18:19:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Edward Liaw X-Patchwork-Id: 795099 Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EB8F414293 for ; Mon, 6 May 2024 18:20:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715019606; cv=none; b=d7FdlayPUNHOfdA4ZMMUKX09A7qtUnKLP6T+h4BDs4Kny7vaDTEsRCeDuFFqKGfQETpk9sJAS4OqH2/o3XyGBpL/+lX6KHtDeVZ/NFK3zam7vb2p9ERCFIvEvVWDU3gZHNV+L9ZHr4fH6E+7uDEXitjtj2Jrg5DqbZUhfbnFvUA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715019606; c=relaxed/simple; bh=29kh0OQhNn8m2tDtlHwrVE2HKUPGcD9TJf7JFu5B20I=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=ALm71xZRfM99RPIQqNZHcglLYtWiv32Tsx0lMarRvlKu89FWXBztfYTxWYk/qjs0G98RUxYmmlzvXVxINzwcae88wFDbXcN8ErGXU4YDMMc1MPTfETMCoSrVuxzp6/uYdUd2KzV9CGlNBx3uKMmhs9m2AMiUUXpFNkvM5jWrzKA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--edliaw.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=EnloiKQk; arc=none smtp.client-ip=209.85.214.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--edliaw.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="EnloiKQk" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-1ee42b9a13cso6522485ad.2 for ; Mon, 06 May 2024 11:20:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1715019604; x=1715624404; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=PEorNdErbbliX1pJbW2p9S8u6EaFLwcWfv6R20jo+hk=; b=EnloiKQkrAMLAaIGOX9w6DVdy1Ispn4i4n+MmsnZrH9V/ISGVplEricaolBTHuWeCF hJ+xkfA0lVk6oyBbWfIAK8gjoRPJzbW2fZNK9CTlM9+UcIXtPmNVNXwD13aephdFYhmx uccbHq8j8aehU6SmyT9m3OXp+7Dxtp36zUG1v0W/Zb08/erNtqRCza5Ug8tCPYvrEiKi dZge/b8zmrTEcZyCZd0y8R0AoBN3sErpbFEe2VMWYOKTy08OSkyUpFZtQ1KWxnTlf/bA zMLWO5wZsXruN9v9c+YJOyANDPmqlNofNJ/nI3yxWjy/xiGZDCtqR5WkEVVkslTmNqDR Lhwg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1715019604; x=1715624404; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=PEorNdErbbliX1pJbW2p9S8u6EaFLwcWfv6R20jo+hk=; b=WRJFbCXvOi+r7wxDmnnhTjXkLxJBMRHFrUrHPgmN663wDhz4Ban75gxp2974LSxpwu LV483yXaN7KusJBjTNkgiCadHo606enYQBvR9Ing8KxHVUuhmdmfGdvnmH0zFon/pMEt 5pkrNgYEm/hJLTTDgyeElunJ8Uicl5JflC+wT8D9VP3DRTC8Ai00Km2CukxP/h+YpSQY bovUy0wD/uv3plMzoqmgC1f1qbEZRbnW9/Yeifq58sU8uDHR0AXXD1z0rHZRTCaFvOKS Suhwtk4Y/UGVkhhtwmgfEgu5wrWxacb2H1u3VQCRisAf9ue1yq/6D9hdjUUrssnle+LM Y2Ow== X-Gm-Message-State: AOJu0Yy4E0BS3ueXBT9POSXFvh9XKrtHj3c2E+w/IcdKVSLuli/A+AKD GepsCrCWlHWfxMvcOOpzX/DuI3HCpdyHd8hBxicRPXXY34w9uqLnMd1BwiUL6Tn94Fti73YF1+4 QgQ== X-Google-Smtp-Source: AGHT+IESrbjMUY8Mv1UKtz5WxeKTzz99i+OpRkFhriDD5+V9JAcwp6S8JYlh7Y55BwCk8V/xyJtIzeIlI/M= X-Received: from edliaw.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:305d]) (user=edliaw job=sendgmr) by 2002:a17:902:ec89:b0:1e8:d158:4e13 with SMTP id x9-20020a170902ec8900b001e8d1584e13mr796623plg.7.1715019604185; Mon, 06 May 2024 11:20:04 -0700 (PDT) Date: Mon, 6 May 2024 18:19:49 +0000 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.45.0.rc1.225.g2a3ae87e7f-goog Message-ID: <20240506181951.1804451-1-edliaw@google.com> Subject: [PATCH v4] selftests/vDSO: change elf_hash parameter to signed char From: Edward Liaw To: linux-kernel@vger.kernel.org, Shuah Khan , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Andy Lutomirski , "H. Peter Anvin" Cc: linux-kselftest@vger.kernel.org, kernel-team@android.com, Edward Liaw , llvm@lists.linux.dev Fixes clang compilation warnings by changing elf_hash's parameter type to char * and casting to unsigned char * inside elf_hash: 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 --- v2: updated commit message with correct compiler warning v3: fixed checkpatch errors and indentation https://lore.kernel.org/all/20240501180622.1676340-1-edliaw@google.com/ v4: moved the typecast into elf_hash based on libelf https://sourceforge.net/p/elftoolchain/code/HEAD/tree/trunk/libelf/elf_hash.c#l47 --- tools/testing/selftests/vDSO/parse_vdso.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) -- 2.45.0.rc1.225.g2a3ae87e7f-goog diff --git a/tools/testing/selftests/vDSO/parse_vdso.c b/tools/testing/selftests/vDSO/parse_vdso.c index 413f75620a35..33db8abd7d59 100644 --- a/tools/testing/selftests/vDSO/parse_vdso.c +++ b/tools/testing/selftests/vDSO/parse_vdso.c @@ -56,12 +56,15 @@ static struct vdso_info } vdso_info; /* Straight from the ELF specification. */ -static unsigned long elf_hash(const unsigned char *name) +static unsigned long elf_hash(const char *name) { unsigned long h = 0, g; - while (*name) + const unsigned char *s; + + s = (const unsigned char *) name; + while (*s) { - h = (h << 4) + *name++; + h = (h << 4) + *s++; if (g = h & 0xf0000000) h ^= g >> 24; h &= ~g;