From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C4D0BC433EF for ; Wed, 6 Jul 2022 17:55:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=tnrVQLydcluFXoVjTDV3pX0SB+/HUZNo0YzQvaLIilg=; b=2QWWt8nQK8dCLL J7vTI9DiaVbJH8xJ+j4ffUvXoQPy9+0OUuHTtZc01Bz2TaqWgY477rzDqEUrymrZ0u11WrqHpNGh9 Y8VpqSjd8ONSUskcRE06UYQztykoQPerQemrOZk05Y2fI1F9FDiDVlkiRIG03nOa7xCSygNE1wHx7 UwzOg4c1H9CbC3ZRerNaJTThcrFRT6F0sNoSj1Idhh0AjMM/DfhaDQRVoHHhYLB71EexUMVhS6w9q x8JVn6+2kvQxnD4Me3QM51+4h5Lg0ythYDQFVWgvEEbkgojgiqRmra1gXnUi9SOOTUIPhPdb9FYzM 2mVo05GSn+k1n3jkn+zw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o99Em-00Bqr9-Lb; Wed, 06 Jul 2022 17:54:56 +0000 Received: from ams.source.kernel.org ([2604:1380:4601:e00::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o99Du-00BqZr-6Z for linux-arm-kernel@lists.infradead.org; Wed, 06 Jul 2022 17:54:03 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id C6433B81ADB; Wed, 6 Jul 2022 17:54:00 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 49439C341C8; Wed, 6 Jul 2022 17:53:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1657130039; bh=CXKbLKzOmn3+Rr6dj2MDJMY8en+5oa/0YHrtas5QQUY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bjU2KGsUfxS+xGQOhnY1OdDP0qSkh68lCZOxLWZn28mJl3TJekSWiREDzwIFq+xnv r2DXqNtvz5wXKIKGTsk3FRIazPNNsDVDWaZtN0HzjPMsasOc3fzAID6tIvjaXUV3Z5 j8K4lJBvizDkUt/bVIhchW/7YWlBJ5S4tFjd8xTy9msB0ZbWxfm3XCY0o6m5SOxA0g smCL27zgAmK7BvASfXoOkAJaCXVdq9dW3I/cjjAFeXzWiFRJqlKHc/o1wYgW/DYs4A nGWo8eG9+LOhbtnd6rr+8bTb8QiSGtdQk1fgwy8pJ4lUdwDBp4kb4ajgQxDSX9lBAx 9/YkwsUQysVWw== From: Mark Brown To: Catalin Marinas , Will Deacon Cc: Suzuki K Poulose , Szabolcs Nagy , linux-arm-kernel@lists.infradead.org, Mark Brown Subject: [PATCH v4 1/3] arm64/hwcap: Document allocation of upper bits of AT_HWCAP Date: Wed, 6 Jul 2022 18:52:54 +0100 Message-Id: <20220706175256.847703-2-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220706175256.847703-1-broonie@kernel.org> References: <20220706175256.847703-1-broonie@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=783; h=from:subject; bh=CXKbLKzOmn3+Rr6dj2MDJMY8en+5oa/0YHrtas5QQUY=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBixcv1v1FetBP2ZdYq1kNylC04BS/AFgJMpfXWiHQF xaqGmmyJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYsXL9QAKCRAk1otyXVSH0DtRCA CHELMym0sXrElqX258raHh4n5WJ6iTQVqYpGvR+ZZPpQZXpgpdj8A/Wh/PBq42lm0vntmYZ3XadC3e QLHfAVVap11eM9L6xhV2eRRKkSHBliPWvMDL3u4a/gcFXa/kpGpRfhDlXlNXk0K9GTq9xZR7iv/J+s myKnVj+O4jU8lMne/mA63WfTanQuTJDcMxUEAL4i6APMBEpmYxNlC0S1P5ZAdOY9K11T2vEfpBkLId u5FnIbBsyJ757L3yCrcYkMGhxaAhF99RlqfdNyrokeyslassWLWUabN64MeFb/jneFjRLBqCnpLgvy i9SNngd/2j7ugE9JLE/Qxq/M2sUQ3/ X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220706_105402_418845_16CD5B03 X-CRM114-Status: GOOD ( 10.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The top two bits of AT_HWCAP are reserved for use by glibc and the rest of the top 32 bits are being kept unallocated for potential use by glibc. Document this in the header. Signed-off-by: Mark Brown --- arch/arm64/include/uapi/asm/hwcap.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/include/uapi/asm/hwcap.h b/arch/arm64/include/uapi/asm/hwcap.h index 4bb2cc8ac446..cc2ccd0a9edf 100644 --- a/arch/arm64/include/uapi/asm/hwcap.h +++ b/arch/arm64/include/uapi/asm/hwcap.h @@ -19,6 +19,9 @@ /* * HWCAP flags - for AT_HWCAP + * + * Bits 60 and 61 are reserved for use by libc. + * Bits 32-59 are unallocated for potential use by libc. */ #define HWCAP_FP (1 << 0) #define HWCAP_ASIMD (1 << 1) -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel