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Tue, 20 Jan 2026 03:14:34 +0000 Date: Tue, 20 Jan 2026 11:14:24 +0800 From: Chao Gao To: Dave Hansen CC: , , Borislav Petkov , "H. 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While it would be possible to stash this ID >off somewhere or read it dynamically, that approaches would not be >consistent with the other fields which can be matched. > >Read the platform ID and store it in cpuinfo_x86->x86_platform_id. > >There are lots of sites to set this new field. Place it near >the place c->microcode is established since the platform ID is >so closely intertwined with microcode updates. > >Note: This should not grow the size of 'struct cpuinfo_x86' in >practice since the u8 fits next to another u8 in the structure. > >Signed-off-by: Dave Hansen >Cc: Thomas Gleixner >Cc: Ingo Molnar >Cc: Borislav Petkov >Cc: Dave Hansen >Cc: "H. Peter Anvin" >Cc: Tony Luck >Cc: Pawan Gupta >Cc: "Peter Zijlstra (Intel)" >Cc: x86@kernel.org >Cc: Jon Kohler >--- > > b/arch/x86/include/asm/processor.h | 1 + > b/arch/x86/kernel/cpu/common.c | 4 +++- > b/arch/x86/kernel/cpu/intel.c | 1 + > 3 files changed, 5 insertions(+), 1 deletion(-) > >diff -puN arch/x86/include/asm/processor.h~cpu-x86_stepping arch/x86/include/asm/processor.h >--- a/arch/x86/include/asm/processor.h~cpu-x86_stepping 2026-01-19 11:38:09.341914025 -0800 >+++ b/arch/x86/include/asm/processor.h 2026-01-19 11:38:09.444917962 -0800 >@@ -140,6 +140,7 @@ struct cpuinfo_x86 { > __u32 x86_vfm; > }; > __u8 x86_stepping; >+ __u8 x86_platform_id; /* Intel-only. 3 bits */ Tail comments are not preferred. I've seen tglx complain about them a few times. Also, "3 bits" is misleading since x86_platform_id actually stores a bit mask.