From: kernel test robot <lkp@intel.com>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: oe-kbuild-all@lists.linux.dev
Subject: [ardb:x86-pie-for-sev-v3 17/22] arch/x86/kernel/sev.o: warning: objtool: vc_handle_mmio+0x8d: can't find switch jump table
Date: Tue, 30 Jan 2024 18:34:34 +0800 [thread overview]
Message-ID: <202401301803.kBJrJ2fo-lkp@intel.com> (raw)
tree: git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git x86-pie-for-sev-v3
head: e808f1d9ecc40f701330869bdb4f8ce0ad23c774
commit: 842c40c07fd9f102438449c58bbfd8a1a640fbab [17/22] x86/sev: Use PIC codegen for early SEV startup code
config: x86_64-randconfig-161-20240130 (https://download.01.org/0day-ci/archive/20240130/202401301803.kBJrJ2fo-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240130/202401301803.kBJrJ2fo-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401301803.kBJrJ2fo-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> arch/x86/kernel/sev.o: warning: objtool: vc_handle_mmio+0x8d: can't find switch jump table
objdump-func vmlinux.o vc_handle_mmio:
0000 0000000000061880 <vc_handle_mmio>:
0000 61880: 41 57 push %r15
0002 61882: 41 56 push %r14
0004 61884: 41 55 push %r13
0006 61886: 41 54 push %r12
0008 61888: 4c 8d 66 08 lea 0x8(%rsi),%r12
000c 6188c: 55 push %rbp
000d 6188d: 53 push %rbx
000e 6188e: 48 89 f5 mov %rsi,%rbp
0011 61891: 49 89 fd mov %rdi,%r13
0014 61894: 4c 89 e7 mov %r12,%rdi
0017 61897: 48 83 ec 28 sub $0x28,%rsp
001b 6189b: 48 8d 74 24 1c lea 0x1c(%rsp),%rsi
0020 618a0: c7 44 24 1c 00 00 00 00 movl $0x0,0x1c(%rsp)
0028 618a8: e8 00 00 00 00 call 618ad <vc_handle_mmio+0x2d> 618a9: R_X86_64_PLT32 insn_decode_mmio-0x4
002d 618ad: 89 c3 mov %eax,%ebx
002f 618af: 85 db test %ebx,%ebx
0031 618b1: 75 0b jne 618be <vc_handle_mmio+0x3e>
0033 618b3: 41 bf 03 00 00 00 mov $0x3,%r15d
0039 618b9: e9 93 03 00 00 jmp 61c51 <vc_handle_mmio+0x3d1>
003e 618be: 89 d8 mov %ebx,%eax
0040 618c0: 48 8b 7d 00 mov 0x0(%rbp),%rdi
0044 618c4: 83 e0 fb and $0xfffffffb,%eax
0047 618c7: 83 f8 02 cmp $0x2,%eax
004a 618ca: 74 17 je 618e3 <vc_handle_mmio+0x63>
004c 618cc: 48 89 fe mov %rdi,%rsi
004f 618cf: 4c 89 e7 mov %r12,%rdi
0052 618d2: e8 00 00 00 00 call 618d7 <vc_handle_mmio+0x57> 618d3: R_X86_64_PLT32 insn_get_modrm_reg_ptr-0x4
0057 618d7: 48 85 c0 test %rax,%rax
005a 618da: 49 89 c6 mov %rax,%r14
005d 618dd: 74 d4 je 618b3 <vc_handle_mmio+0x33>
005f 618df: 48 8b 7d 00 mov 0x0(%rbp),%rdi
0063 618e3: f6 87 88 00 00 00 03 testb $0x3,0x88(%rdi)
006a 618ea: 41 bf 01 00 00 00 mov $0x1,%r15d
0070 618f0: 0f 85 5b 03 00 00 jne 61c51 <vc_handle_mmio+0x3d1>
0076 618f6: 83 fb 06 cmp $0x6,%ebx
0079 618f9: 0f 87 4c 03 00 00 ja 61c4b <vc_handle_mmio+0x3cb>
007f 618ff: 48 8d 15 00 00 00 00 lea 0x0(%rip),%rdx # 61906 <vc_handle_mmio+0x86> 61902: R_X86_64_PC32 .rodata+0x1037c
0086 61906: 48 63 04 9a movslq (%rdx,%rbx,4),%rax
008a 6190a: 48 01 d0 add %rdx,%rax
008d 6190d: ff e0 jmp *%rax
008f 6190f: 44 8b 64 24 1c mov 0x1c(%rsp),%r12d
0094 61914: 4d 8d bd 00 08 00 00 lea 0x800(%r13),%r15
009b 6191b: 49 81 fc f0 07 00 00 cmp $0x7f0,%r12
00a2 61922: 4c 89 e3 mov %r12,%rbx
00a5 61925: 76 35 jbe 6195c <vc_handle_mmio+0xdc>
00a7 61927: 80 3d 00 00 00 00 00 cmpb $0x0,0x0(%rip) # 6192e <vc_handle_mmio+0xae> 61929: R_X86_64_PC32 .data.once+0x4b
00ae 6192e: 75 2c jne 6195c <vc_handle_mmio+0xdc>
00b0 61930: c6 05 00 00 00 00 01 movb $0x1,0x0(%rip) # 61937 <vc_handle_mmio+0xb7> 61932: R_X86_64_PC32 .data.once+0x4b
00b7 61937: 90 nop
00b8 61938: 48 8d 15 00 00 00 00 lea 0x0(%rip),%rdx # 6193f <vc_handle_mmio+0xbf> 6193b: R_X86_64_PC32 .LC17-0x4
00bf 6193f: 48 8d 3d 00 00 00 00 lea 0x0(%rip),%rdi # 61946 <vc_handle_mmio+0xc6> 61942: R_X86_64_PC32 .LC18-0x4
00c6 61946: b9 f0 07 00 00 mov $0x7f0,%ecx
00cb 6194b: 4c 89 e6 mov %r12,%rsi
00ce 6194e: e8 00 00 00 00 call 61953 <vc_handle_mmio+0xd3> 6194f: R_X86_64_PLT32 __warn_printk-0x4
00d3 61953: 90 nop
00d4 61954: 0f 0b ud2
00d6 61956: 90 nop
00d7 61957: 90 nop
00d8 61958: 8b 5c 24 1c mov 0x1c(%rsp),%ebx
00dc 6195c: 4c 89 e2 mov %r12,%rdx
00df 6195f: 4c 89 f6 mov %r14,%rsi
00e2 61962: 4c 89 ff mov %r15,%rdi
00e5 61965: eb 5a jmp 619c1 <vc_handle_mmio+0x141>
00e7 61967: 44 8b 64 24 1c mov 0x1c(%rsp),%r12d
00ec 6196c: 4d 8d b5 00 08 00 00 lea 0x800(%r13),%r14
00f3 61973: 4c 8d 7d 40 lea 0x40(%rbp),%r15
00f7 61977: 49 81 fc f0 07 00 00 cmp $0x7f0,%r12
00fe 6197e: 4c 89 e3 mov %r12,%rbx
0101 61981: 76 35 jbe 619b8 <vc_handle_mmio+0x138>
0103 61983: 80 3d 00 00 00 00 00 cmpb $0x0,0x0(%rip) # 6198a <vc_handle_mmio+0x10a> 61985: R_X86_64_PC32 .data.once+0x4a
010a 6198a: 75 2c jne 619b8 <vc_handle_mmio+0x138>
010c 6198c: c6 05 00 00 00 00 01 movb $0x1,0x0(%rip) # 61993 <vc_handle_mmio+0x113> 6198e: R_X86_64_PC32 .data.once+0x4a
0113 61993: 90 nop
0114 61994: 48 8d 15 00 00 00 00 lea 0x0(%rip),%rdx # 6199b <vc_handle_mmio+0x11b> 61997: R_X86_64_PC32 .LC19-0x4
011b 6199b: 48 8d 3d 00 00 00 00 lea 0x0(%rip),%rdi # 619a2 <vc_handle_mmio+0x122> 6199e: R_X86_64_PC32 .LC18-0x4
0122 619a2: b9 f0 07 00 00 mov $0x7f0,%ecx
0127 619a7: 4c 89 e6 mov %r12,%rsi
012a 619aa: e8 00 00 00 00 call 619af <vc_handle_mmio+0x12f> 619ab: R_X86_64_PLT32 __warn_printk-0x4
012f 619af: 90 nop
0130 619b0: 0f 0b ud2
0132 619b2: 90 nop
0133 619b3: 90 nop
0134 619b4: 8b 5c 24 1c mov 0x1c(%rsp),%ebx
0138 619b8: 4c 89 e2 mov %r12,%rdx
013b 619bb: 4c 89 fe mov %r15,%rsi
013e 619be: 4c 89 f7 mov %r14,%rdi
0141 619c1: e8 00 00 00 00 call 619c6 <vc_handle_mmio+0x146> 619c2: R_X86_64_PLT32 memcpy-0x4
0146 619c6: 31 c9 xor %ecx,%ecx
0148 619c8: 89 da mov %ebx,%edx
014a 619ca: 48 89 ee mov %rbp,%rsi
014d 619cd: 4c 89 ef mov %r13,%rdi
0150 619d0: e8 eb fc ff ff call 616c0 <vc_do_mmio>
0155 619d5: 41 89 c7 mov %eax,%r15d
0158 619d8: e9 74 02 00 00 jmp 61c51 <vc_handle_mmio+0x3d1>
015d 619dd: 8b 54 24 1c mov 0x1c(%rsp),%edx
0161 619e1: b9 01 00 00 00 mov $0x1,%ecx
0166 619e6: 48 89 ee mov %rbp,%rsi
0169 619e9: 4c 89 ef mov %r13,%rdi
016c 619ec: e8 cf fc ff ff call 616c0 <vc_do_mmio>
0171 619f1: 85 c0 test %eax,%eax
0173 619f3: 41 89 c7 mov %eax,%r15d
0176 619f6: 0f 85 55 02 00 00 jne 61c51 <vc_handle_mmio+0x3d1>
017c 619fc: 8b 54 24 1c mov 0x1c(%rsp),%edx
0180 61a00: 83 fa 04 cmp $0x4,%edx
0183 61a03: 75 0b jne 61a10 <vc_handle_mmio+0x190>
0185 61a05: 49 c7 06 00 00 00 00 movq $0x0,(%r14)
018c 61a0c: 8b 54 24 1c mov 0x1c(%rsp),%edx
0190 61a10: 49 8d b5 00 08 00 00 lea 0x800(%r13),%rsi
0197 61a17: 4c 89 f7 mov %r14,%rdi
019a 61a1a: e8 00 00 00 00 call 61a1f <vc_handle_mmio+0x19f> 61a1b: R_X86_64_PLT32 memcpy-0x4
019f 61a1f: e9 2d 02 00 00 jmp 61c51 <vc_handle_mmio+0x3d1>
01a4 61a24: 8b 54 24 1c mov 0x1c(%rsp),%edx
01a8 61a28: b9 01 00 00 00 mov $0x1,%ecx
01ad 61a2d: 48 89 ee mov %rbp,%rsi
01b0 61a30: 4c 89 ef mov %r13,%rdi
01b3 61a33: e8 88 fc ff ff call 616c0 <vc_do_mmio>
01b8 61a38: 85 c0 test %eax,%eax
01ba 61a3a: 41 89 c7 mov %eax,%r15d
01bd 61a3d: 0f 85 0e 02 00 00 jne 61c51 <vc_handle_mmio+0x3d1>
01c3 61a43: 0f b6 45 58 movzbl 0x58(%rbp),%eax
01c7 61a47: 83 f8 08 cmp $0x8,%eax
01ca 61a4a: 73 2c jae 61a78 <vc_handle_mmio+0x1f8>
01cc 61a4c: a8 04 test $0x4,%al
01ce 61a4e: 74 12 je 61a62 <vc_handle_mmio+0x1e2>
01d0 61a50: 41 c7 06 00 00 00 00 movl $0x0,(%r14)
01d7 61a57: 41 c7 44 06 fc 00 00 00 00 movl $0x0,-0x4(%r14,%rax,1)
01e0 61a60: eb aa jmp 61a0c <vc_handle_mmio+0x18c>
01e2 61a62: 85 c0 test %eax,%eax
01e4 61a64: 74 a6 je 61a0c <vc_handle_mmio+0x18c>
01e6 61a66: a8 02 test $0x2,%al
01e8 61a68: 41 c6 06 00 movb $0x0,(%r14)
01ec 61a6c: 74 9e je 61a0c <vc_handle_mmio+0x18c>
01ee 61a6e: 66 41 c7 44 06 fe 00 00 movw $0x0,-0x2(%r14,%rax,1)
01f6 61a76: eb 94 jmp 61a0c <vc_handle_mmio+0x18c>
01f8 61a78: 49 8d 7e 08 lea 0x8(%r14),%rdi
01fc 61a7c: 4c 89 f2 mov %r14,%rdx
01ff 61a7f: 49 c7 06 00 00 00 00 movq $0x0,(%r14)
0206 61a86: 49 c7 44 06 f8 00 00 00 00 movq $0x0,-0x8(%r14,%rax,1)
020f 61a8f: 48 83 e7 f8 and $0xfffffffffffffff8,%rdi
0213 61a93: 48 29 fa sub %rdi,%rdx
0216 61a96: 01 d0 add %edx,%eax
0218 61a98: c1 e8 03 shr $0x3,%eax
021b 61a9b: 89 c1 mov %eax,%ecx
021d 61a9d: 31 c0 xor %eax,%eax
021f 61a9f: f3 48 ab rep stos %rax,%es:(%rdi)
0222 61aa2: e9 65 ff ff ff jmp 61a0c <vc_handle_mmio+0x18c>
0227 61aa7: 8b 54 24 1c mov 0x1c(%rsp),%edx
022b 61aab: b9 01 00 00 00 mov $0x1,%ecx
0230 61ab0: 48 89 ee mov %rbp,%rsi
0233 61ab3: 4c 89 ef mov %r13,%rdi
0236 61ab6: e8 05 fc ff ff call 616c0 <vc_do_mmio>
023b 61abb: 85 c0 test %eax,%eax
023d 61abd: 41 89 c7 mov %eax,%r15d
0240 61ac0: 0f 85 8b 01 00 00 jne 61c51 <vc_handle_mmio+0x3d1>
0246 61ac6: 83 7c 24 1c 01 cmpl $0x1,0x1c(%rsp)
024b 61acb: 75 0d jne 61ada <vc_handle_mmio+0x25a>
024d 61acd: 41 0f b6 85 00 08 00 00 movzbl 0x800(%r13),%eax
0255 61ad5: c0 f8 07 sar $0x7,%al
0258 61ad8: eb 0c jmp 61ae6 <vc_handle_mmio+0x266>
025a 61ada: 41 0f b7 85 00 08 00 00 movzwl 0x800(%r13),%eax
0262 61ae2: 66 c1 f8 0f sar $0xf,%ax
0266 61ae6: 0f b6 55 58 movzbl 0x58(%rbp),%edx
026a 61aea: 0f b6 c0 movzbl %al,%eax
026d 61aed: 48 b9 01 01 01 01 01 01 01 01 movabs $0x101010101010101,%rcx
0277 61af7: 48 0f af c1 imul %rcx,%rax
027b 61afb: 83 fa 08 cmp $0x8,%edx
027e 61afe: 73 31 jae 61b31 <vc_handle_mmio+0x2b1>
0280 61b00: f6 c2 04 test $0x4,%dl
0283 61b03: 74 0d je 61b12 <vc_handle_mmio+0x292>
0285 61b05: 41 89 06 mov %eax,(%r14)
0288 61b08: 41 89 44 16 fc mov %eax,-0x4(%r14,%rdx,1)
028d 61b0d: e9 fa fe ff ff jmp 61a0c <vc_handle_mmio+0x18c>
0292 61b12: 85 d2 test %edx,%edx
0294 61b14: 0f 84 f2 fe ff ff je 61a0c <vc_handle_mmio+0x18c>
029a 61b1a: f6 c2 02 test $0x2,%dl
029d 61b1d: 41 88 06 mov %al,(%r14)
02a0 61b20: 0f 84 e6 fe ff ff je 61a0c <vc_handle_mmio+0x18c>
02a6 61b26: 66 41 89 44 16 fe mov %ax,-0x2(%r14,%rdx,1)
02ac 61b2c: e9 db fe ff ff jmp 61a0c <vc_handle_mmio+0x18c>
02b1 61b31: 49 8d 7e 08 lea 0x8(%r14),%rdi
02b5 61b35: 4c 89 f1 mov %r14,%rcx
02b8 61b38: 49 89 06 mov %rax,(%r14)
02bb 61b3b: 49 89 44 16 f8 mov %rax,-0x8(%r14,%rdx,1)
02c0 61b40: 48 83 e7 f8 and $0xfffffffffffffff8,%rdi
02c4 61b44: 48 29 f9 sub %rdi,%rcx
02c7 61b47: 01 ca add %ecx,%edx
02c9 61b49: c1 ea 03 shr $0x3,%edx
02cc 61b4c: 89 d1 mov %edx,%ecx
02ce 61b4e: f3 48 ab rep stos %rax,%es:(%rdi)
02d1 61b51: e9 b6 fe ff ff jmp 61a0c <vc_handle_mmio+0x18c>
02d6 61b56: be 04 00 00 00 mov $0x4,%esi
02db 61b5b: 44 8b 6c 24 1c mov 0x1c(%rsp),%r13d
02e0 61b60: e8 00 00 00 00 call 61b65 <vc_handle_mmio+0x2e5> 61b61: R_X86_64_PLT32 insn_get_seg_base-0x4
02e5 61b65: 48 8b 7d 00 mov 0x0(%rbp),%rdi
02e9 61b69: 48 89 c3 mov %rax,%rbx
02ec 61b6c: be 05 00 00 00 mov $0x5,%esi
02f1 61b71: e8 00 00 00 00 call 61b76 <vc_handle_mmio+0x2f6> 61b72: R_X86_64_PLT32 insn_get_seg_base-0x4
02f6 61b76: 48 83 fb ff cmp $0xffffffffffffffff,%rbx
02fa 61b7a: 74 06 je 61b82 <vc_handle_mmio+0x302>
02fc 61b7c: 48 83 f8 ff cmp $0xffffffffffffffff,%rax
0300 61b80: 75 1e jne 61ba0 <vc_handle_mmio+0x320>
0302 61b82: 48 c7 45 78 0d 00 00 00 movq $0xd,0x78(%rbp)
030a 61b8a: 48 c7 85 80 00 00 00 00 00 00 00 movq $0x0,0x80(%rbp)
0315 61b95: 41 bf 04 00 00 00 mov $0x4,%r15d
031b 61b9b: e9 b1 00 00 00 jmp 61c51 <vc_handle_mmio+0x3d1>
0320 61ba0: 48 89 44 24 08 mov %rax,0x8(%rsp)
0325 61ba5: 48 8b 45 00 mov 0x0(%rbp),%rax
0329 61ba9: 4c 8d 74 24 20 lea 0x20(%rsp),%r14
032e 61bae: 45 89 ea mov %r13d,%r10d
0331 61bb1: 48 89 ef mov %rbp,%rdi
0334 61bb4: 4c 89 f2 mov %r14,%rdx
0337 61bb7: 4c 89 14 24 mov %r10,(%rsp)
033b 61bbb: 48 03 58 68 add 0x68(%rax),%rbx
033f 61bbf: 48 8b 48 70 mov 0x70(%rax),%rcx
0343 61bc3: 48 89 4c 24 10 mov %rcx,0x10(%rsp)
0348 61bc8: 4c 89 d1 mov %r10,%rcx
034b 61bcb: 48 89 de mov %rbx,%rsi
034e 61bce: e8 ad f1 ff ff call 60d80 <vc_read_mem>
0353 61bd3: 85 c0 test %eax,%eax
0355 61bd5: 41 89 c7 mov %eax,%r15d
0358 61bd8: 4c 8b 14 24 mov (%rsp),%r10
035c 61bdc: 4c 8b 44 24 08 mov 0x8(%rsp),%r8
0361 61be1: 75 6e jne 61c51 <vc_handle_mmio+0x3d1>
0363 61be3: 48 8b 74 24 10 mov 0x10(%rsp),%rsi
0368 61be8: 4c 89 d1 mov %r10,%rcx
036b 61beb: 4c 89 f2 mov %r14,%rdx
036e 61bee: 48 89 ef mov %rbp,%rdi
0371 61bf1: 4c 01 c6 add %r8,%rsi
0374 61bf4: e8 c7 f3 ff ff call 60fc0 <vc_write_mem>
0379 61bf9: 85 c0 test %eax,%eax
037b 61bfb: 41 89 c7 mov %eax,%r15d
037e 61bfe: 75 51 jne 61c51 <vc_handle_mmio+0x3d1>
0380 61c00: 48 8b 55 00 mov 0x0(%rbp),%rdx
0384 61c04: 44 89 e8 mov %r13d,%eax
0387 61c07: 4c 89 e7 mov %r12,%rdi
038a 61c0a: f7 d8 neg %eax
038c 61c0c: f6 82 91 00 00 00 04 testb $0x4,0x91(%rdx)
0393 61c13: 41 0f 44 c5 cmove %r13d,%eax
0397 61c17: 48 98 cltq
0399 61c19: 48 01 42 68 add %rax,0x68(%rdx)
039d 61c1d: 48 8b 55 00 mov 0x0(%rbp),%rdx
03a1 61c21: 48 01 42 70 add %rax,0x70(%rdx)
03a5 61c25: e8 00 00 00 00 call 61c2a <vc_handle_mmio+0x3aa> 61c26: R_X86_64_PLT32 insn_has_rep_prefix-0x4
03aa 61c2a: 84 c0 test %al,%al
03ac 61c2c: 74 23 je 61c51 <vc_handle_mmio+0x3d1>
03ae 61c2e: 48 8b 45 00 mov 0x0(%rbp),%rax
03b2 61c32: 48 83 68 58 01 subq $0x1,0x58(%rax)
03b7 61c37: 48 8b 45 00 mov 0x0(%rbp),%rax
03bb 61c3b: 48 83 78 58 00 cmpq $0x0,0x58(%rax)
03c0 61c40: b8 05 00 00 00 mov $0x5,%eax
03c5 61c45: 44 0f 45 f8 cmovne %eax,%r15d
03c9 61c49: eb 06 jmp 61c51 <vc_handle_mmio+0x3d1>
03cb 61c4b: 41 bf 01 00 00 00 mov $0x1,%r15d
03d1 61c51: 48 83 c4 28 add $0x28,%rsp
03d5 61c55: 44 89 f8 mov %r15d,%eax
03d8 61c58: 5b pop %rbx
03d9 61c59: 5d pop %rbp
03da 61c5a: 41 5c pop %r12
03dc 61c5c: 41 5d pop %r13
03de 61c5e: 41 5e pop %r14
03e0 61c60: 41 5f pop %r15
03e2 61c62: c3 ret
03e3 61c63: 66 66 2e 0f 1f 84 00 00 00 00 00 data16 cs nopw 0x0(%rax,%rax,1)
03ee 61c6e: 66 66 2e 0f 1f 84 00 00 00 00 00 data16 cs nopw 0x0(%rax,%rax,1)
03f9 61c79: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2024-01-30 10:36 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=202401301803.kBJrJ2fo-lkp@intel.com \
--to=lkp@intel.com \
--cc=ardb@kernel.org \
--cc=oe-kbuild-all@lists.linux.dev \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.