#2662: gcc 4.5.0 -Os does not generate correct code
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Reporter: bdu...@… | Owner: bdu...@…
Type: defect | Status: assigned
Priority: high | Milestone: 6.7
Component: Book | Version: SVN
Severity: major | Keywords:
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Comment(by hohoxu_hao115):
Replying to [comment:8 bdu...@…]:
> Replying to [comment:7 hohoxu_hao115]:
> > I think this bug is hardware dependent.My kernel compiled by gcc-4.5
for x86_64,with or without size optimization,has no problems.
>
> Thanks for the feedback. The obvious question is "Did it boot
properly." The build normally completes, but the kernel panics upon boot.
>
> Can you post the results of `cat \proc\cpuinfo`
>
> It would also help if you could run the following from the kernel
directory:
>
> gcc -Wp,-MD,arch/x86/kernel/.tsc.o.d -nostdinc -isystem
> /usr/lib/gcc/x86_64-unknown-linux-gnu/4.5.1/include
> -I/sources/linux-2.6.33.4-gcc45/arch/x86/include -Iinclude -include
> include/generated/autoconf.h -D__KERNEL__ -Wall -Wundef -Wstrict-
prototypes
> -Wno-trigraphs -fno-strict-aliasing -fno-common
> -Werror-implicit-function-declaration -Wno-format-security
> -fno-delete-null-pointer-checks -Os -m64 -march=core2 -mno-red-zone
> -mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args
-DCONFIG_AS_CFI=1
> -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -pipe -Wno-sign-compare
> -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
> -Wframe-larger-than=2048 -fno-stack-protector -fno-omit-frame-pointer
> -fno-optimize-sibling-calls -Wdeclaration-after-statement -Wno-pointer-
sign
> -fno-strict-overflow -fno-dwarf2-cfi-asm -fconserve-stack -fno-stack-
protector
> -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(tsc)"
> -D"KBUILD_MODNAME=KBUILD_STR(tsc)" -S -c -o arch/x86/kernel/tsc.S
> arch/x86/kernel/tsc.c
>
> and post arch/x86/kernel/tsc.S as an attachment
>
> If you can check your log of the build, where arch/x86/kernel/tsc.c is
built, does it match the above build string?
Yes,it boots fine.
/proc/cpuinfo:
{{{
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 37
model name : Intel(R) Core(TM) i3 CPU M 330 @ 2.13GHz
stepping : 2
cpu MHz : 933.000
cache size : 3072 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology
nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16
xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm arat tpr_shadow vnmi flexpriority
ept vpid
bogomips : 4256.09
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 37
model name : Intel(R) Core(TM) i3 CPU M 330 @ 2.13GHz
stepping : 2
cpu MHz : 933.000
cache size : 3072 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 2
apicid : 1
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology
nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16
xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm arat tpr_shadow vnmi flexpriority
ept vpid
bogomips : 4255.76
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
processor : 2
vendor_id : GenuineIntel
cpu family : 6
model : 37
model name : Intel(R) Core(TM) i3 CPU M 330 @ 2.13GHz
stepping : 2
cpu MHz : 933.000
cache size : 3072 KB
physical id : 0
siblings : 4
core id : 2
cpu cores : 2
apicid : 4
initial apicid : 4
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology
nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16
xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm arat tpr_shadow vnmi flexpriority
ept vpid
bogomips : 4255.77
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
processor : 3
vendor_id : GenuineIntel
cpu family : 6
model : 37
model name : Intel(R) Core(TM) i3 CPU M 330 @ 2.13GHz
stepping : 2
cpu MHz : 933.000
cache size : 3072 KB
physical id : 0
siblings : 4
core id : 2
cpu cores : 2
apicid : 5
initial apicid : 5
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology
nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16
xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm arat tpr_shadow vnmi flexpriority
ept vpid
bogomips : 4255.77
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
}}}
and I checked the build command of tsc.o, I can't find any differences
with yours except kernel source path.
PS:In my build log,it's -D__KERNEL__, not -DKERNEL,may be this difference
is related to kernel version(I use 2.6.34)?
Sorry for my english.
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