Messages in this thread | | | Date | Thu, 25 Aug 2011 15:47:26 -0400 | Subject | Re: [GIT PULL] x86/vdso changes for v3.1 | From | Arnaud Lacombe <> |
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Hi,
On Thu, Aug 25, 2011 at 3:16 PM, Andrew Lutomirski <luto@mit.edu> wrote: > On Thu, Aug 25, 2011 at 10:06 AM, Arnaud Lacombe <lacombar@gmail.com> wrote: >> On Thu, Aug 25, 2011 at 7:51 AM, Andrew Lutomirski <luto@mit.edu> wrote: >>> On Thu, Aug 25, 2011 at 1:58 AM, Arnaud Lacombe <lacombar@gmail.com> wrote: >>>> Hi, > >>>> >>>> commit 59e97e4d6fbcd5b74a94cb48bcbfc6f8478a5e93 >>>> Author: Andy Lutomirski <luto@mit.edu> >>>> Date: Wed Jul 13 09:24:10 2011 -0400 >>>> >>>> x86: Make alternative instruction pointers relative >>>> >>>> This save a few bytes on x86-64 and means that future patches can >>>> apply alternatives to unrelocated code. >>>> >>>> Signed-off-by: Andy Lutomirski <luto@mit.edu> >>>> Link: http://lkml.kernel.org/r/ff64a6b9a1a3860ca4a7b8b6dc7b4754f9491cd7.1310563276.git.luto@mit.edu >>>> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> >>>> >>> >>> I probably missed a hardcoded alternative entry that depends on >>> config. Can you send me your System.map and the output of objdump -s >>> -j .altinstructions vmlinux? >>> >> see attached. >> >>> I'm also having issues building from your .config. Building >>> 59e97e4d6fbcd5b74a94cb48bcbfc6f8478a5e93 asks me about Moorestown MID >>> platform, Ethernet, etc. >>> >> yes, the config is against -rc3. An `oldnoconfig' should do the job >> before the build. >> > > I still can't reproduce this. I'm building the attached .config on > the v3.1-rc3, running make ARCH=i386 oldnoconfig (which spews a lot of > changes), then building with ARCH=i386 and test-booting in KVM. No > panic. > > Can you either send me a real .config and exact commit that you're > building or try the attached patch and tell me what it says? > Trace:
CPU: Intel QEMU Virtual CPU version 0.14.50 stepping 03 About to apply_alternatives start=c13bee88 a=0 instr_offset=-3922530 instr=cpu_idle+0x26/0x60 repl_offset=2336 repl=__alt_instructions_end+0x0/0x29f instrlen=5 repllen=3 done start=c13bee88 a=1 instr_offset=-3922053 instr=prepare_to_copy+0xf/0x90 repl_offset=0 repl=__alt_instructions+0x10/0x924 instrlen=2 repllen=0 no change start=c13bee88 a=2 instr_offset=-3922050 instr=prepare_to_copy+0x1e/0x90 repl_offset=2315 repl=__alt_instructions_end+0x3/0x29f instrlen=3 repllen=3 no change start=c13bee88 a=3 instr_offset=-3922038 instr=prepare_to_copy+0x36/0x90 repl_offset=2306 repl=__alt_instructions_end+0x6/0x29f instrlen=10 repllen=8 no change start=c13bee88 a=4 instr_offset=-3922000 instr=prepare_to_copy+0x68/0x90 repl_offset=0 repl=__alt_instructions+0x34/0x924 instrlen=2 repllen=0 done start=c13bee88 a=5 instr_offset=-3921520 instr=__switch_to+0x34/0x1b0 repl_offset=0 repl=__alt_instructions+0x40/0x924 instrlen=5 repllen=0 no change start=c13bee88 a=6 instr_offset=-3921514 instr=__switch_to+0x46/0x1b0 repl_offset=2278 repl=__alt_instructions_end+0xe/0x29f instrlen=3 repllen=3 no change start=c13bee88 a=7 instr_offset=-3921498 instr=__switch_to+0x62/0x1b0 repl_offset=2269 repl=__alt_instructions_end+0x11/0x29f instrlen=10 repllen=8 no change start=c13bee88 a=8 instr_offset=-3921461 instr=__switch_to+0x93/0x1b0 repl_offset=2265 repl=__alt_instructions_end+0x19/0x29f instrlen=4 repllen=3 done start=c13bee88 a=9 instr_offset=-3921284 instr=__switch_to+0x150/0x1b0 repl_offset=0 repl=__alt_instructions+0x70/0x924 instrlen=2 repllen=0 done start=c13bee88 a=10 instr_offset=-1054249774 instr=0x82655bd2 repl_offset=-1053034552 repl=0x8277e6cc instrlen=5 repllen=5 BUG: unable to handle kernel paging request at 8277e6cc IP: [<c1376672>] apply_alternatives+0x13a/0x222 *pde = 00000000 Oops: 0000 [#1] DEBUG_PAGEALLOC
Pid: 0, comm: swapper Not tainted 3.1.0-rc3+ #26 Bochs Bochs EIP: 0060:[<c1376672>] EFLAGS: 00000286 CPU: 0 EIP is at apply_alternatives+0x13a/0x222 EAX: ffffffff EBX: c13bee88 ECX: 00000005 EDX: c13bef00 ESI: 8277e6cc EDI: c1349e9a EBP: c1349fa4 ESP: c1349e50 DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 Process swapper (pid: 0, ti=c1348000 task=c134e340 task.ti=c1348000) Stack: c130f040 c13bee88 0000000a c1296cd2 82655bd2 c13bf7c8 8277e6cc 00000005 00000005 c1349e9a 82655bd2 05140e31 00000005 c1349e05 8277e6cc 00000078 c13bf7ac c13bef00 f689001c c1f69000 00000000 00000001 c1418560 c1418570 Call Trace: [<c1296cd2>] ? simd_coprocessor_error+0x2/0x10 [<c11418a0>] ? serial8250_start_tx+0xe0/0xe0 [<c101ec59>] ? __call_console_drivers+0x59/0x70 [<c101f29c>] ? console_unlock+0x10c/0x150 [<c1023b24>] ? irq_exit+0x54/0x90 [<c10039c3>] ? do_IRQ+0x43/0xa0 [<c1294d59>] ? printk+0x18/0x1f [<c12975a9>] ? common_interrupt+0x29/0x30 [<c1376780>] alternative_instructions+0x26/0x4d [<c1377605>] check_bugs+0x91/0x93 [<c13716b6>] start_kernel+0x289/0x294 [<c13711b7>] ? loglevel+0x1a/0x1a [<c13710b3>] i386_start_kernel+0xb3/0xbb
- Arnaud
> Thanks, > Andy > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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