From patchwork Wed Oct 16 12:30:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhuo, Qiuxu" X-Patchwork-Id: 13838441 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.15]) (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 167D3208972; Wed, 16 Oct 2024 12:54:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.15 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729083253; cv=none; b=Ceha0g+AqOTX7NM67PRoQOphVQb+btC7GS3KiNlo3Rr5gElzOmF1Z6oxJG6ZJa3UWnmJz6C2adJQkP8RjbW17aB8AqAHnM6gKicrxcai1ZL1cvwWkPFNUlRyQ0igGLEtJc/YN5/zH9hvz+bV+zbpMA4WcsTDVytFis+yNEqpuyY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729083253; c=relaxed/simple; bh=sqtaSqXECldmbQXgoQpmNNoPMlSVJcxlT9DyUld/VCY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=Pv+aVNjtIFozXCGTHjcoyD2I2meqfNB+a38BQmEFXHooH5SFCm4+Kon0T9b/YL301EoK4aH1CypbqVLNdHsYtg29FTMqawGFgO+wxSSZxIqtZEo7s10aUXbU0s5rBqyN6q6YLYImBpvrwIaNBk3lgmvQNyFP2oDQ46aCX0V/Ib0= 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=SW6sEFRx; arc=none smtp.client-ip=198.175.65.15 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="SW6sEFRx" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1729083253; x=1760619253; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=sqtaSqXECldmbQXgoQpmNNoPMlSVJcxlT9DyUld/VCY=; b=SW6sEFRxytxCd2bbVjvDZSScziRiRvuXNBv1/wlKqe4Ee4JwmTd+jjcN jKS6Jc2Dqtj8GuHKPvHl+cST7DZbUWybkK2cnDhyHUgmAFowtYCeMmtaa K28V2eCqBborIvx3OKVkf5xXZFnEW6X/ba843QzE3VVKj6cVQvGE3O3qG 71cVobR1pALpAwvQCFtmFdhUabCoPnWF5GzBD9u+PdSbwVTXLemP1Woa7 cygBoAVdPUhWxUqbDiQ9LV1loC5io+O8n+bZ/dU3K+863mYKGt0fOxDaX Q1n++ToNq5kLZEZm3cAp0gGJvXoZ/8WEu008xCRPHs6W5ArBIVjiwsLD/ A==; X-CSE-ConnectionGUID: 1FUKrM66Q0KTMmUVl92/Zg== X-CSE-MsgGUID: kKPKewyoTXyOY7p4nElHNA== X-IronPort-AV: E=McAfee;i="6700,10204,11222"; a="32217507" X-IronPort-AV: E=Sophos;i="6.11,199,1725346800"; d="scan'208";a="32217507" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Oct 2024 05:54:12 -0700 X-CSE-ConnectionGUID: z7He18iMS02ZPMB8kTHUNQ== X-CSE-MsgGUID: Tz0IwFCGQa2QONFSeTUyaQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,208,1725346800"; d="scan'208";a="82761701" Received: from qiuxu-clx.sh.intel.com ([10.239.53.109]) by fmviesa005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Oct 2024 05:54:09 -0700 From: Qiuxu Zhuo To: tony.luck@intel.com, bp@alien8.de Cc: tglx@linutronix.de, dave.hansen@linux.intel.com, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org, qiuxu.zhuo@intel.com Subject: [PATCH v2 04/10] x86/mce/threshold: Remove the redundant this_cpu_dec_return() Date: Wed, 16 Oct 2024 20:30:30 +0800 Message-Id: <20241016123036.21366-5-qiuxu.zhuo@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20241016123036.21366-1-qiuxu.zhuo@intel.com> References: <20241010153202.30876-1-qiuxu.zhuo@intel.com> <20241016123036.21366-1-qiuxu.zhuo@intel.com> Precedence: bulk X-Mailing-List: linux-edac@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The 'storm' variable points to this_cpu_ptr(&storm_desc). Access the 'stormy_bank_count' field through the 'storm' to avoid calling this_cpu_*() on the same per-CPU variable twice. This minor optimization reduces the text size by 16 bytes. $ size threshold.o.* text data bss dec hex filename 1395 1664 0 3059 bf3 threshold.o.old 1379 1664 0 3043 be3 threshold.o.new No functional changes intended. Reviewed-by: Tony Luck Signed-off-by: Qiuxu Zhuo --- arch/x86/kernel/cpu/mce/threshold.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/mce/threshold.c b/arch/x86/kernel/cpu/mce/threshold.c index 89e31e1e5c9c..f4a007616468 100644 --- a/arch/x86/kernel/cpu/mce/threshold.c +++ b/arch/x86/kernel/cpu/mce/threshold.c @@ -90,7 +90,7 @@ void cmci_storm_end(unsigned int bank) storm->banks[bank].in_storm_mode = false; /* If no banks left in storm mode, stop polling. */ - if (!this_cpu_dec_return(storm_desc.stormy_bank_count)) + if (!--storm->stormy_bank_count) mce_timer_kick(false); }