RE: [RFC PATCH 0/8] Rework READ_ONCE() to improve codegen

[David Laight]

From: Will Deacon
> Sent: 10 January 2020 16:56
...
> The rough summary of the series is:
> 
>   * Drop the GCC 4.8 workarounds, so that READ_ONCE() is a
>     straightforward dereference of a cast-to-volatile pointer.

What is the effect of using the changed code on older compilers (esp. x86-64)?
Requiring gcc > 4.8 is a significant bump.

	David

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