From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794575485; b=tgi2OH9oipzWq2cF8/oYjnyw6nffjGCJXMgPD/2rEnU+bN1OmZ9f8tqp93LtBjGyeEXJ bE4i8vZLlB6jmf7WiEb03KsPze1VD8nCul+7K6ogABF3OXgXZ3MsLiNXXuVjZXPOrYkVl WxSEvqr13UTqEjw5qZadcW4E9IN3Nx02R/H4fC0wDIY7oZOS917ZOVLsqc5tLnOH+AQQX Bu0h0QLId/e0wRQWwklCa9CYLa645SFXGIHzTzq65Lbmlnt/EJe+V1Kn7NAzahDMEJtx1 p1qsCCCwCx1ZGow7QhQk5Bq44EkdZFQLyYEipuLMTsRDyS7OQjv+3WYA/RwKBdAm8/A== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794575485; h=Received:DKIM-Signature:Date:From:To:Cc:Subject:Message-ID:X-Mailer: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=qFtqGYTUNjzUMFsrvi1S0kj12LfH81X2ePo6PmzMZ8s=; b=DqCiClDDVM128NrZGRWE6hA5Od3cOrmPDQ8D41UlMjuoq8oq4k4mL0eFPi58imTm9oED p22PTVGclRYNeqrIc/0Ta36GTcg25Nv3Ek68zB8mLQ4kGfaHcMQT3i7EOIiPW8Q+qbP4I Hqve1nJYrgfT+SiCyTVQmiIxcI/xcJ/UwVutpTNUZ9Cz1/JENg3HhD8xjTYEZFErU7IZy qNy771HvrWctATQw0fOSOYLW/ENWgmHeJXYhEPu2qfZFyoHEJCfnH6qspqOPO3DNizED/ KU3AODmSM6R2GPQhCYw38Sk8ILoUy/xQrWWjyynSCdTdw9BdENB4nzhPyRreNg2BXiQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=J4dEznPn; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6A0D260A2622; Fri, 13 Nov 2026 13:11:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=J4dEznPn Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4935A1F000CB; Fri, 13 Nov 2026 13:11:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794575485; bh=qFtqGYTUNjzUMFsrvi1S0kj12LfH81X2ePo6PmzMZ8s=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=J4dEznPnZVV05l9En6yqvyZDvjtEy+Q5xoLBHeTu6rXs99d3+spn7QkVa9mBt8yoK SwwfyWimhp7A4uocyxYg8ByLb13Ne9Kc9uwo9vAov+jE93Py0ib7eVN7aZ+5yuqepq Ew9F76GbfloXcIYf60ui0ecN4MNSqko/s6D2CAS8b84CSGYKqoOvY7iKayjN/5ArjJ Bf4kbEYNs34bkb12aepNeLQ819B9/dg3KL3vC0Q76EaNfZGnf0ZNGYseWkC0XSA+5O LCOlrx639rbHgTtJujt2dn3yKWUeuwOPJtSQZTZVG4YyiDXpclAmr9eUrNYGB1LaCn J1RGlWwQ0aQEA== Date: Fri, 13 Nov 2026 14:11:17 +0100 From: Alejandro Colomar To: linux-hardening@vger.kernel.org Cc: Alejandro Colomar , Krzysztof Kozlowski , "Maciej W. Rozycki" , Geert Uytterhoeven , Andreas Schwab , Andy Shevchenko , Bartosz Golaszewski , Daniel Scally , Danilo Krummrich , Greg Kroah-Hartman , Hans Verkuil , Heikki Krogerus , Joe Perches , Johan Hovold , Kees Cook , Laurent Pinchart , Len Brown , Linus Torvalds , Linus Walleij , Namhyung Kim , "Rafael J. Wysocki" , Rob Herring , Sakari Ailus , Saravana Kannan , Steven Rostedt , Tom Zanussi , linux-acpi@vger.kernel.org, driver-core@lists.linux.dev, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org Subject: [PATCH v5 7/7] string: Implement strstarts() with strprefix() Message-ID: <382a44f7c68672ecead2436d9f569ee23f383830.1794574496.git.alx@kernel.org> X-Mailer: git-send-email 2.55.0 References: X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="7k3j24klskngolpj" Content-Disposition: inline In-Reply-To: --7k3j24klskngolpj Content-Type: text/plain; protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable From: Alejandro Colomar To: linux-hardening@vger.kernel.org Cc: Alejandro Colomar , Krzysztof Kozlowski , "Maciej W. Rozycki" , Geert Uytterhoeven , Andreas Schwab , Andy Shevchenko , Bartosz Golaszewski , Daniel Scally , Danilo Krummrich , Greg Kroah-Hartman , Hans Verkuil , Heikki Krogerus , Joe Perches , Johan Hovold , Kees Cook , Laurent Pinchart , Len Brown , Linus Torvalds , Linus Walleij , Namhyung Kim , "Rafael J. Wysocki" , Rob Herring , Sakari Ailus , Saravana Kannan , Steven Rostedt , Tom Zanussi , linux-acpi@vger.kernel.org, driver-core@lists.linux.dev, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org Subject: [PATCH v5 7/7] string: Implement strstarts() with strprefix() Message-ID: <382a44f7c68672ecead2436d9f569ee23f383830.1794574496.git.alx@kernel.org> References: MIME-Version: 1.0 In-Reply-To: The compiler should be able to optimize out the unused pointer arithmetic done at the end, so performance-wise this shouldn't change anything. This change de-duplicates the almost-identical implementations, and better shows the relationship between the two functions. Signed-off-by: Alejandro Colomar --- include/linux/string.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/string.h b/include/linux/string.h index b1468d3913f6..015d2c7ee6c2 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -608,7 +608,7 @@ static inline const char *strprefix(const char *s, cons= t char *prefix) */ static inline bool strstarts(const char *str, const char *prefix) { - return strncmp(str, prefix, strlen(prefix)) =3D=3D 0; + return strprefix(str, prefix); } =20 /** --=20 2.55.0 --7k3j24klskngolpj Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEES7Jt9u9GbmlWADAi64mZXMKQwqkFAmr3DHUACgkQ64mZXMKQ wqnLwA//WtiQCSR9YMqBx8L2aue7x9Qj4+hXDLVCAOfRvOmsHqkxBdQ9cY2xZ6/F MOuH0+c33PPFNENCj7SbrYKc4x3ri2/whEiBiROfYElLAHkglecYr2Z8dfEPL/hq SWajYY8WTuthJgrEKwI+b2iGgmCMHOD+DkJkXiPfTCqUZduwlWCFAC2h2Tut7m+E OVo811ViJnxlql6eXP4e8Xvcl3k16/3VXEygU/4YkqaImGb7eZQ/ZP+S8ApewcY5 44y9K5GgLpg0HjeoGPOqkG2gr6hZi4rR36mMKzLJI7TDOtMBz+xCHk0PlgBstypK yzYZ7bjYfW8AH+ZpeGYc+RHsfb5s1xPgAVcpJ8lWGPcq2ZtfFRcv02AV6mN/vsit 4cfFJti2mHDkDxM3LI05PjEuBrrCRnqDF06ZldgEawPztY2GWWnuGJS3y7oq2EhR W3Z7xDUbgvT57Ol7deOjSrpKhiJ4w4NEh100CgsolfGuM4RZCNwq9dRmRZpXebiq +GYlzTIFpIO/pnDTGscV47S0uUtQby629SCsx5k6yKs+RFI7jPGu95ucm0aBgOAS o4057EKqRReM32gmpi+WOPgoz7O3F4JwFC6R5kr+VKnd8EOlRbXes2EzHHcNgRVt pr0SbVQ0dpARbz0mXxKFlgX8lvoMReU4VDtn15UATo/PUq9pY0g= =sI0e -----END PGP SIGNATURE----- --7k3j24klskngolpj--