]> git.ipfire.org Git - thirdparty/kernel/stable.git/commit
x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper
authorTianxiang Peng <txpeng@tencent.com>
Mon, 23 Jun 2025 09:31:53 +0000 (17:31 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 28 Aug 2025 14:28:47 +0000 (16:28 +0200)
commit7207923d8453ebfb35667c1736169f2dd796772e
treec7621bb71ba33b0c228c30736fe06d9dd7125a18
parent4986548825fe4b8050b06ba14263b56940032804
x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper

commit d8df126349dad855cdfedd6bbf315bad2e901c2f upstream.

Since

  923f3a2b48bd ("x86/resctrl: Query LLC monitoring properties once during boot")

resctrl_cpu_detect() has been moved from common CPU initialization code to
the vendor-specific BSP init helper, while Hygon didn't put that call in their
code.

This triggers a division by zero fault during early booting stage on our
machines with X86_FEATURE_CQM* supported, where get_rdt_mon_resources() tries
to calculate mon_l3_config with uninitialized boot_cpu_data.x86_cache_occ_scale.

Add the missing resctrl_cpu_detect() in the Hygon BSP init helper.

  [ bp: Massage commit message. ]

Fixes: 923f3a2b48bd ("x86/resctrl: Query LLC monitoring properties once during boot")
Signed-off-by: Tianxiang Peng <txpeng@tencent.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Hui Li <caelli@tencent.com>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/20250623093153.3016937-1-txpeng@tencent.com
Signed-off-by: Tianxiang Peng <txpeng@tencent.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/x86/kernel/cpu/hygon.c