On 11/23, Arnd Bergmann wrote:

Ok, thanks for the confirmation.

Summarizing what we've found, I think we can get away with just
introducing two Kconfig symbols ARCH_MULTI_V7VE and CPU_V7VE.
Most CPUs fall clearly into one category or the other, and then
we can allow LPAE to be selected for V7VE-only build but not
for plain V7, and we can unconditionally build the kernel with

arch-$(CONFIG_CPU_32v7VE)  = -D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7ve,-march=armv7-a -mcpu=cortex-a15)

This causes compiler spew for me:

  warning: switch -mcpu=cortex-a15 conflicts with -march=armv7-a switch

Removing -march=armv7-a from there makes it quiet.

Also, it's sort of feels wrong to have -mcpu in a place where
we're exclusively doing -march. Perhaps the fallback should be
bog standard -march=armv7-a? (or the fallback for that one
"-march=armv5t -Wa$(comma)-march=armv7-a")?

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