[Bug 207173] kvm compiling problem 5.6.x kvm_main.c:2236:42: error: ‘nr_pages_avail’ may be used uninitialized in this function

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=207173

zoran.davidovac@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|blocking                    |enhancement

--- Comment #7 from zoran.davidovac@gmail.com ---
Interesting, 

I did not know that -O3 is not supported on x86 or x86_64,
in kernel Doc it does not say it is not supported and
It worked very well until now :)

So this happen also to size optimized kernel?

But now I also know why O3 is disabled in menuconfig :)

KBUILD_CFLAGS += -O2
else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
KBUILD_CFLAGS += -O3
else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
KBUILD_CFLAGS += -Os
endif

I've read somewhere that on arm -O3 is related to implicit parallelism 

Changed category to enhancement, let me know if I need to change anything else?

thx.

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