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Message-ID: <097a4926cebc9030469d42cc7a3392b39dfd703d.camel@nvidia.com> Date: Thu, 15 May 2025 19:06:10 +0000 From: Timur Tabi <ttabi@...dia.com> To: "jpoimboe@...nel.org" <jpoimboe@...nel.org> CC: "dakr@...nel.org" <dakr@...nel.org>, "a.hindborg@...nel.org" <a.hindborg@...nel.org>, "ojeda@...nel.org" <ojeda@...nel.org>, "boqun.feng@...il.com" <boqun.feng@...il.com>, "patches@...ts.linux.dev" <patches@...ts.linux.dev>, "stable@...r.kernel.org" <stable@...r.kernel.org>, "tmgross@...ch.edu" <tmgross@...ch.edu>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "alex.gaynor@...il.com" <alex.gaynor@...il.com>, "benno.lossin@...ton.me" <benno.lossin@...ton.me>, John Hubbard <jhubbard@...dia.com>, "rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>, "bjorn3_gh@...tonmail.com" <bjorn3_gh@...tonmail.com>, "peterz@...radead.org" <peterz@...radead.org>, Joel Fernandes <joelagnelf@...dia.com>, "aliceryhl@...gle.com" <aliceryhl@...gle.com>, "gary@...yguo.net" <gary@...yguo.net>, Alexandre Courbot <acourbot@...dia.com>, Alistair Popple <apopple@...dia.com> Subject: Re: [PATCH 1/5] objtool/rust: add one more `noreturn` Rust function for Rust 1.87.0 On Thu, 2025-05-15 at 09:18 -0700, Josh Poimboeuf wrote: > > Since I build with LLVM=1, I'm assuming the answer is 18.1.3 > > I'm not able to recreate, can you run with OBJTOOL_VERBOSE=1 and paste > the output? You probably can't repro because it includes code that hasn't been merged upstream yet. Try this: https://github.com/ttabi/linux/commits/alex CHK kernel/kheaders_data.tar.xz drivers/gpu/nova-core/nova_core.o: warning: objtool: _RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFro mNtB5_13BiosImageBaseE8try_from() falls through to next function _RNvMsd_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14FwSecBiosImage12fwsec_header() drivers/gpu/nova-core/nova_core.o: warning: objtool: _RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFro mNtB5_13BiosImageBaseE8try_from+0x5c: (branch) drivers/gpu/nova-core/nova_core.o: warning: objtool: _RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFro mNtB5_13BiosImageBaseE8try_from+0x4a: (branch) drivers/gpu/nova-core/nova_core.o: warning: objtool: _RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFro mNtB5_13BiosImageBaseE8try_from+0x0: <=== (sym) ./tools/objtool/objtool --hacks=jump_label --hacks=noinstr --hacks=skylake --mcount --mnop -- retpoline --rethunk --sls --stackval --static-call --uaccess --prefix=16 --module drivers/gpu/nova- core/nova_core.o.orig -o drivers/gpu/nova-core/nova_core.o 0000 0000000000006230 <_RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFr omNtB5_13BiosImageBaseE8try_from>: 0000 6230: 55 push %rbp 0001 6231: 48 89 e5 mov %rsp,%rbp 0004 6234: 53 push %rbx 0005 6235: 48 83 ec 18 sub $0x18,%rsp 0009 6239: 48 89 fb mov %rdi,%rbx 000c 623c: 48 8b 3e mov (%rsi),%rdi 000f 623f: 48 8b 4e 10 mov 0x10(%rsi),%rcx 0013 6243: c7 45 f2 ff b8 42 49 movl $0x4942b8ff,-0xe(%rbp) 001a 624a: 66 c7 45 f6 54 00 movw $0x54,-0xa(%rbp) 0020 6250: 48 83 f9 06 cmp $0x6,%rcx 0024 6254: 72 42 jb 6298 <_RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFr omNtB5_13BiosImageBaseE8try_from+0x68> 0026 6256: 48 8d 51 fb lea -0x5(%rcx),%rdx 002a 625a: 31 c0 xor %eax,%eax 002c 625c: 0f 1f 40 00 nopl 0x0(%rax) 0030 6260: 44 8b 04 07 mov (%rdi,%rax,1),%r8d 0034 6264: 44 33 45 f2 xor -0xe(%rbp),%r8d 0038 6268: 44 0f b7 4c 07 04 movzwl 0x4(%rdi,%rax,1),%r9d 003e 626e: 66 44 33 4d f6 xor -0xa(%rbp),%r9w 0043 6273: 45 0f b7 c9 movzwl %r9w,%r9d 0047 6277: 45 09 c1 or %r8d,%r9d 004a 627a: 74 0a je 6286 <_RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFr omNtB5_13BiosImageBaseE8try_from+0x56> 004c 627c: 48 ff c0 inc %rax 004f 627f: 48 39 c2 cmp %rax,%rdx 0052 6282: 75 dc jne 6260 <_RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFr omNtB5_13BiosImageBaseE8try_from+0x30> 0054 6284: eb 12 jmp 6298 <_RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFr omNtB5_13BiosImageBaseE8try_from+0x68> 0056 6286: 48 89 ca mov %rcx,%rdx 0059 6289: 48 29 c2 sub %rax,%rdx 005c 628c: 0f 82 ac 00 00 00 jb 633e <_RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFr omNtB5_13BiosImageBaseE8try_from+0x10e> 0062 6292: 48 83 fa 0c cmp $0xc,%rdx 0066 6296: 73 30 jae 62c8 <_RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFr omNtB5_13BiosImageBaseE8try_from+0x98> 0068 6298: c7 43 08 ea ff ff ff movl $0xffffffea,0x8(%rbx) 006f 629f: 48 c7 03 02 00 00 00 movq $0x2,(%rbx) 0076 62a6: 48 8b 46 08 mov 0x8(%rsi),%rax 007a 62aa: 48 85 c0 test %rax,%rax 007d 62ad: 48 0f 44 f8 cmove %rax,%rdi 0081 62b1: 31 f6 xor %esi,%esi 0083 62b3: 31 d2 xor %edx,%edx 0085 62b5: e8 00 00 00 00 call 62ba <_RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFr omNtB5_13BiosImageBaseE8try_from+0x8a> 62b6: R_X86_64_PLT32 rust_helper_krealloc-0x4 008a 62ba: 48 89 d8 mov %rbx,%rax 008d 62bd: 48 83 c4 18 add $0x18,%rsp 0091 62c1: 5b pop %rbx 0092 62c2: 5d pop %rbp 0093 62c3: e9 00 00 00 00 jmp 62c8 <_RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFr omNtB5_13BiosImageBaseE8try_from+0x98> 62c4: R_X86_64_PLT32 __x86_return_thunk-0x4 0098 62c8: 66 81 3c 07 ff b8 cmpw $0xb8ff,(%rdi,%rax,1) 009e 62ce: 75 c8 jne 6298 <_RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFr omNtB5_13BiosImageBaseE8try_from+0x68> 00a0 62d0: 81 7c 07 02 42 49 54 00 cmpl $0x544942,0x2(%rdi,%rax,1) 00a8 62d8: 75 be jne 6298 <_RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFr omNtB5_13BiosImageBaseE8try_from+0x68> 00aa 62da: 0f b6 4c 07 0a movzbl 0xa(%rdi,%rax,1),%ecx 00af 62df: 8b 54 07 06 mov 0x6(%rdi,%rax,1),%edx 00b3 62e3: 44 0f b6 44 07 0b movzbl 0xb(%rdi,%rax,1),%r8d 00b9 62e9: c7 45 ec 42 49 54 00 movl $0x544942,-0x14(%rbp) 00c0 62f0: 66 c7 45 f0 ff b8 movw $0xb8ff,-0x10(%rbp) 00c6 62f6: 48 c1 e1 20 shl $0x20,%rcx 00ca 62fa: 49 c1 e0 28 shl $0x28,%r8 00ce 62fe: 49 09 c8 or %rcx,%r8 00d1 6301: 44 8b 4d ee mov -0x12(%rbp),%r9d 00d5 6305: 48 c7 03 01 00 00 00 movq $0x1,(%rbx) 00dc 630c: 48 89 43 08 mov %rax,0x8(%rbx) 00e0 6310: 48 8d 7b 10 lea 0x10(%rbx),%rdi 00e4 6314: b9 0d 00 00 00 mov $0xd,%ecx 00e9 6319: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi) 00ec 631c: c7 43 78 01 00 42 49 movl $0x49420001,0x78(%rbx) 00f3 6323: 44 89 4b 7c mov %r9d,0x7c(%rbx) 00f7 6327: 49 c1 e8 20 shr $0x20,%r8 00fb 632b: 66 44 89 83 84 00 00 00 mov %r8w,0x84(%rbx) 0103 6333: 89 93 80 00 00 00 mov %edx,0x80(%rbx) 0109 6339: e9 7c ff ff ff jmp 62ba <_RNvXsa_NtCs8S3917Wilyo_9nova_core5vbiosNtB5_14PciAtBiosImageINtNtCsgK88DPai1lC_4core7convert7TryFr omNtB5_13BiosImageBaseE8try_from+0x8a> 010e 633e: 48 89 c7 mov %rax,%rdi 0111 6341: 48 89 ce mov %rcx,%rsi 0114 6344: 48 c7 c2 00 00 00 00 mov $0x0,%rdx 6347: R_X86_64_32S .rodata+0x1058 011b 634b: e8 00 00 00 00 call 6350 <.Ltmp38> 634c: R_X86_64_PLT32 _RNvNtNtCsgK88DPai1lC_4core5slice5index26slice_start_index_len_fail-0x4
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