> On Sep 15, 2017, at 11:47 AM, Linus Torvalds <[email protected]> > wrote: > >> On Fri, Sep 15, 2017 at 3:22 AM, Pavel Machek <[email protected]> wrote: >> >> Let me pull latest... >> >> 711aab1dbb324d321e3d84368a435a78908c7bce >> >> (Strange. Not authored by Linus and old?) > > That's the author date, the committer date is new. Top of tree right > now just happens to be a patch I applied, it's much more commonly a > merge I've done. > >> But result is still similar, this time with more debug information. >> [ 0.116813] x86: Booting SMP configuration: >> [ 0.116893] .... node #0, CPUs: #1 >> [ 0.004000] Initializing CPU#1 >> [ 0.004000] ------------[ cut here ]------------ >> [ 0.004000] WARNING: CPU: 1 PID: 0 at arch/x86/mm/tlb.c:257 >> initialize_tlbstate_and_flush+0x2e/0xed >> [ 0.004000] Hardware name: LENOVO 17097HU/17097HU, BIOS 7BETD8WW (2.19 ) >> 03/31/2011 >> [ 0.004000] task: f5ca2080 task.stack: f5cc4000 >> [ 0.004000] EIP: initialize_tlbstate_and_flush+0x2e/0xed >> [ 0.004000] EFLAGS: 00210087 CPU: 1 >> [ 0.004000] EAX: 0504b000 EBX: c4f15540 ECX: c4f15710 EDX: 00000000 >> [ 0.004000] ESI: 04ee7000 EDI: f5ca2080 EBP: f5cc5f54 ESP: f5cc5f44 >> [ 0.004000] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 >> [ 0.004000] CR0: 80050033 CR2: 00000000 CR3: 04ee7000 CR4: 000006b0 >> [ 0.004000] Call Trace: >> [ 0.004000] cpu_init+0xdc/0x2f0 >> [ 0.004000] start_secondary+0x34/0x1c6 >> [ 0.004000] startup_32_smp+0x164/0x166 >> [ 0.004000] ? startup_32_smp+0x164/0x166 >> [ 0.004000] Code: 56 53 83 ec 08 64 8b 1d c0 c0 03 c5 b9 10 57 f1 c4 e8 >> de 65 9e 00 89 45 f0 89 55 f4 0f 20 de 8b 43 20 05 00 00 00 40 39 c6 74 11 >> <0f> ff 50 56 68 74 9c d8 c4 e8 d1 cd 04 00 83 c4 0c a1 20 90 f8 >> [ 0.004000] ---[ end trace 7439e29925a49b51 ]--- >> [ 0.004000] # CR3: 0000000004ee7000, __pa(mm->pgd): 000000000504b000 > > Ok, clearly Andy didn't get the 32-bit SMP bringup path right. > Presumable tested a 32-bit UP image, or in a single-cpu VM? > > Andy?
The warning only triggers on 32-bit SMP. The issue seems to be that boot_cpu_has(X86_FEATURE_PCID) is true despite setup_clear_cpu_cap. I'm still trying to figure out why. I'll hopefully have a patch after lunch. > > Linus
