Re: Typo in linux-2.6.38/arch/x86/kernel/entry_32.S

[Ingo Molnar]

* Eric Valette <eric.valette@xxxxxxx> wrote:

> I guess its binutils git of the 2011/03/02
> 
> As far as I'm concerned I only found one occurence on one machine
> although I compiled tree 2.6.38 kernels for different machines.
> because its under the CONFIG_KVM_GUEST flag

Unofortunately there's also a CONFIG_XEN=y build breakage caused by this new 
binutils behavior, going back from v2.6.38 to v2.6.27-rc1 and breaking 
bisection builds for over 130,000 commits covering an almost 3 years window of 
kernel history.

GAS allowed such debug symbol mismatches for over a decade and never reported 
anything. It's nice that binutils now checks for this condition (we need more 
automation in this area) and the most helpful would be for the assembler to 
report the mismatch via a new *warning* - and by also ignore the symbol in 
question.

Instead this harmless condition was escallated into an unnecessary, 
retroactive, show-stopping build failure, which is an exceedingly lame and 
harmful. Tools should be permissive, and they should help not hinder 
development.

The kernel side fix is upstream already and i've attached it below. That 
obviously does not help bisecting testers who will trigger the build failure 
after the first bisection step ...

Thanks,

	Ingo

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