From: Tianxiang Peng txpeng@tencent.com
[ Upstream commit d8df126349dad855cdfedd6bbf315bad2e901c2f ]
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 [ Adjust context ] Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/kernel/cpu/hygon.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/x86/kernel/cpu/hygon.c b/arch/x86/kernel/cpu/hygon.c index 8a80d5343f3a..4f69e85bc255 100644 --- a/arch/x86/kernel/cpu/hygon.c +++ b/arch/x86/kernel/cpu/hygon.c @@ -14,6 +14,7 @@ #include <asm/cacheinfo.h> #include <asm/spec-ctrl.h> #include <asm/delay.h> +#include <asm/resctrl.h>
#include "cpu.h"
@@ -239,6 +240,8 @@ static void bsp_init_hygon(struct cpuinfo_x86 *c) x86_amd_ls_cfg_ssbd_mask = 1ULL << 10; } } + + resctrl_cpu_detect(c); }
static void early_init_hygon(struct cpuinfo_x86 *c)