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CVE-2025-39681 x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper

Description

In the Linux kernel, the following vulnerability has been resolved: x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper 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. ]

Affected products and versions

Product	Affected versions	Fixed in
Linux 6.17	earliest → < 6.17	6.17
Linux 6.16	earliest → < 6.16.4	6.16.4
Linux 6.12	earliest → < 6.12.44	6.12.44
Linux 6.6	earliest → < 6.6.103	6.6.103
Linux 6.1	earliest → < 6.1.149	6.1.149
Linux 5.15	earliest → < 5.15.190	5.15.190
Linux 5.10	earliest → < 5.10.242	5.10.242
Linux	5.8	No fix stated
SIMATIC CN 4100 5.0	earliest → < 5.0	5.0

Show the 3 other branches

Product	Affected versions	Fixed in
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated