From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.16]) (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 D302539937C for ; Tue, 7 Jul 2026 09:35:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783416915; cv=none; b=pJ89eyApXw6usHQOEIJTjegcnv5Zb4P1fQu0ikEP/mbaKSzw/8gh+xxkrUFuM2mfc1IxWdnlBW3mqHX+pnu//OdUsaxF0XPO2KvkVIolkUOQXzHtEYQDgER05GwlmuiIl8OxxChIrC5lE1gMESbzkhcVLneWAEfMCSJhAc6vPzc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783416915; c=relaxed/simple; bh=zh6bfRZDR21O0hQCv9y1kWHf08ejX5KBHXPErVczrlA=; h=Date:From:To:Cc:Subject:Message-ID; b=Fv0GqvMofQmoZVOYdc2JvYRJzySGzvpwowWBx+MU/pQj5UNQpH3OsHyhKXO6IxtfYIn2eKDgnrbUpSSVXXc58tHciVboFAqcv9wajDGw43cQCI4e1f/giatHJzjlDgt7VGsK5t2VJyYriBs+6zKMbatDAvAtBd3BHYGDUe/uuLw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=WRNvHVBI; arc=none smtp.client-ip=192.198.163.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="WRNvHVBI" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1783416913; x=1814952913; h=date:from:to:cc:subject:message-id; bh=zh6bfRZDR21O0hQCv9y1kWHf08ejX5KBHXPErVczrlA=; b=WRNvHVBIH84/QlJwjBVIj43LZ5qEuv6D8B1+21Ds2NktoQhKiyBJfF+C r4PQPH/x15RL/HOjBXf/u48Qk0tXE4xJ2n2zhDHFueisfhEJ8dAzTViEb 2OXVT/Gx/6XERwpGlsTPdldXOWEdrRONSiq9najyY1z/1nLWff8MLMBB1 zv3PonEKRh931fz43CfL9qyEfZ5nV1AdotospIfYcJV32MCVoEn6lAGzn s/GWmrB1pISvc0Cy0usmJ7JT0ltIamzBJfTx0mJPfNFfMbpWFQF43Bc4Q NAgIxEUpp6KqecxfYnkI45R2WFwvvJ3UTjGg0iqZTAShB26AQhDw0/3GO g==; X-CSE-ConnectionGUID: CNczquTkSjOHIvRoYThKBQ== X-CSE-MsgGUID: xLGptx1cRGSJWrO3/y+Nug== X-IronPort-AV: E=McAfee;i="6800,10657,11839"; a="71580924" X-IronPort-AV: E=Sophos;i="6.25,153,1779174000"; d="scan'208";a="71580924" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jul 2026 02:35:12 -0700 X-CSE-ConnectionGUID: LaDsnf7jTqKJ+07SmPCEUA== X-CSE-MsgGUID: IkVccCUeSOiKf12FJp4rRg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,153,1779174000"; d="scan'208";a="278319047" Received: from lkp-server02.sh.intel.com (HELO ea128546eb3d) ([10.239.97.151]) by fmviesa001.fm.intel.com with ESMTP; 07 Jul 2026 02:35:10 -0700 Received: from kbuild by ea128546eb3d with local (Exim 4.98.2) (envelope-from ) id 1wh2Cq-00000000FCf-1kS4; Tue, 07 Jul 2026 09:35:08 +0000 Date: Tue, 07 Jul 2026 17:34:49 +0800 From: kernel test robot To: Jan Polensky Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, Alexander Gordeev Subject: warning: unstable feature specified for `-Ctarget-feature`: `backchain` Message-ID: <202607071750.4f5d6hPj-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53 commit: 3f70ebe638581e73c8df6b3fa7eed9b45d90b083 s390: Enable Rust support date: 4 weeks ago config: s390-randconfig-001-20260707 (https://download.01.org/0day-ci/archive/20260707/202607071750.4f5d6hPj-lkp@intel.com/config) compiler: clang version 21.1.8 (https://github.com/llvm/llvm-project 2078da43e25a4623cab2d0d60decddf709aaea28) rustc: rustc 1.96.0 (ac68faa20 2026-05-25) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260707/202607071750.4f5d6hPj-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Fixes: 3f70ebe63858 ("s390: Enable Rust support") | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202607071750.4f5d6hPj-lkp@intel.com/ All warnings (new ones prefixed by >>): >> warning: unstable feature specified for `-Ctarget-feature`: `backchain` | = note: this feature is not stably supported; its behavior can change in the future -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki