From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 88E5620B20B; Tue, 12 Nov 2024 10:26:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731407174; cv=none; b=bNzoBlH8oekCNJy9q0Qs4NQpYZOD0NfJbAGxIF/988PTKsfW2FKxIi3kuedEmi386pK/cll70zjQTOlYM+0YMe1NRnUZqTOtHhiW7ms2At9ZFg4hQHIz/y8ryak2PxQdThZUfgUnEtOHQv4IeUN6jBEPpY1WIXsbqWZ6ybfmK00= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731407174; c=relaxed/simple; bh=7VefaCYu/wINSpoY0SkxTA+QChKCePF5IXuVJydyxWE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dsnpYHKky5bQUKIutBLuuFP6QZCv3CgVS99p+0WYGLINunKsz1pjaeMrPyVn7aboVvU7q3NDTtJKy09dljWgasEVui7HcUn4FXFl7Bik/1cOJPi89f6txOWLonoXdfckkEXaV308NazBkRlo5UsNvNGHB5AIOIzPfWiWZY2JjCc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=m8RJC5jx; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="m8RJC5jx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9835FC4CEDA; Tue, 12 Nov 2024 10:26:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1731407174; bh=7VefaCYu/wINSpoY0SkxTA+QChKCePF5IXuVJydyxWE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=m8RJC5jxpcBekATrhb4lTu0/+3XV9iI0Hfwn50l3rXPbgkguU1e2P9VpIyGtbKeAP d4CjHZ90+eXsPLPV9iDekRm38jQH31TiXA2JPhccXCDMuMjRM5UaW9bo0HKi4pmk1z 89YBZIppB1UErsCCJ2rcs+zcxWXC09tTEIDwbDFc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Linux Kernel Functional Testing , Ard Biesheuvel , Dan Carpenter , "Paul E. McKenney" , "Rafael J. Wysocki" , Nathan Chancellor Subject: [PATCH 5.15 73/76] ACPI: PRM: Clean up guid type in struct prm_handler_info Date: Tue, 12 Nov 2024 11:21:38 +0100 Message-ID: <20241112101842.557993613@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241112101839.777512218@linuxfoundation.org> References: <20241112101839.777512218@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dan Carpenter commit 3d1c651272cf1df8aac7d9b6d92d836d27bed50f upstream. Clang 19 prints a warning when we pass &th->guid to efi_pa_va_lookup(): drivers/acpi/prmt.c:156:29: error: passing 1-byte aligned argument to 4-byte aligned parameter 1 of 'efi_pa_va_lookup' may result in an unaligned pointer access [-Werror,-Walign-mismatch] 156 | (void *)efi_pa_va_lookup(&th->guid, handler_info->handler_address); | ^ The problem is that efi_pa_va_lookup() takes a efi_guid_t and &th->guid is a regular guid_t. The difference between the two types is the alignment. efi_guid_t is a typedef. typedef guid_t efi_guid_t __aligned(__alignof__(u32)); It's possible that this a bug in Clang 19. Even though the alignment of &th->guid is not explicitly specified, it will still end up being aligned at 4 or 8 bytes. Anyway, as Ard points out, it's cleaner to change guid to efi_guid_t type and that also makes the warning go away. Fixes: 088984c8d54c ("ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM handler and context") Reported-by: Linux Kernel Functional Testing Suggested-by: Ard Biesheuvel Signed-off-by: Dan Carpenter Tested-by: Paul E. McKenney Acked-by: Ard Biesheuvel Link: https://patch.msgid.link/3777d71b-9e19-45f4-be4e-17bf4fa7a834@stanley.mountain [ rjw: Subject edit ] Signed-off-by: Rafael J. Wysocki [nathan: Fix conflicts due to lack of e38abdab441c] Signed-off-by: Nathan Chancellor Signed-off-by: Greg Kroah-Hartman --- drivers/acpi/prmt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/acpi/prmt.c +++ b/drivers/acpi/prmt.c @@ -52,7 +52,7 @@ struct prm_context_buffer { static LIST_HEAD(prm_module_list); struct prm_handler_info { - guid_t guid; + efi_guid_t guid; void *handler_addr; u64 static_data_buffer_addr; u64 acpi_param_buffer_addr;