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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1783124466; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=nhQI8qrC1+u/J9NZuv3XyN01AIsqOde2x76wYlNC8WM=; b=BS4ui7F1n8y9YLLRS7xGfVRmM9PrQ1NaYnwBB6b5ezq/2Xvv16B1OJ3GluXFE81Vado51k AHtaRNz/zcyvLaegy5t2p3Xc3fQTc2fiSnJl9w2/3IC2jWPaMs/40YWaJ/pxuSRFV9GOeC 8G/QEIUtIp4tZY/kGkh09G9ZuKrmHXg= From: Ihor Solodrai To: Borislav Petkov , Dave Hansen , Ingo Molnar , Thomas Gleixner Cc: Alexei Starovoitov , Andrii Nakryiko , Andrey Ryabinin , Andrew Morton , "H . Peter Anvin" , Andrey Konovalov , bpf@vger.kernel.org, kernel-team@meta.com, kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 0/5] x86/cpu: Refactor identify_cpu() Date: Fri, 3 Jul 2026 17:20:41 -0700 Message-ID: <20260704002046.3859585-1-ihor.solodrai@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 6C6BB140007 X-Stat-Signature: 9rgw4tz4nh97nr7jdd1fnkbr8pb7qhy4 X-Rspam-User: X-HE-Tag: 1783124468-784634 X-HE-Meta: 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 jV6mqOd+ C2B7FSIrdQ+up6jH7KntHKPbp8KFGpUmuuVsVpbwOeKuCLSqxJFhgyVXtdG6cOASr0x4tJIc1dwvc2iOdH8R/tzHcLh6Qn9rVcNsvzNKk3QqBBkdPrqmQ3hkk6cvJ7qOYaOtPjqfgoy3LZ3XsYT2C1z1D9ZrzummbXbntOnXXD/Y1SjHzjBOhOf9GshbP6ol0OGAAMlEhMcuwgpoEXuHOfb22pAEvkWh7TIPC6sjLRkssypZuCMPirg4IabVZHJU4wQoExuNwwsBWfboIocuPtZTyRWiDdo5YXhvalqM57+Wegc0hXlYtM6L2SCgJ3b//uONdcho/a90zv20KYnRB97T0a4Ro+04cxP64 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This series refactors identify_cpu() machinery on x86 and then implements a fix for a bug when cpu capabilities are temporarily cleared within an interruptable window. For more details and discussion see the relevant bug report [1]. Suggested-by: Borislav Petkov Signed-off-by: Ihor Solodrai [1] https://lore.kernel.org/bpf/20260610175651.647515-1-ihor.solodrai@linux.dev/ Ihor Solodrai (5): x86/cpu: Factor init_cpu_info() out of identify_cpu() x86/cpu: Inline generic_identify() into identify_cpu() x86/cpu: Introduce identify_cpu_32() helper x86/cpu: Set X86_BUG_ESPFIX in identify_cpu_32() x86/cpu: Don't reset boot CPU cpuinfo in identify_cpu() arch/x86/kernel/cpu/common.c | 114 +++++++++++++++++++---------------- 1 file changed, 61 insertions(+), 53 deletions(-) -- 2.54.0