Re: [PATCH] ARM: cache-v7: Disable preemption when reading CCSIDR

From: Nicolas Pitre
Date: Thu Feb 02 2012 - 16:38:04 EST

On Thu, 2 Feb 2012, Russell King - ARM Linux wrote:

> On Thu, Feb 02, 2012 at 11:24:46AM -0800, Stephen Boyd wrote:
> > Should we move get_thread_info into assembler.h? It seems odd
> > to include entry-header.S but I saw that vfp was doing the same.
> Probably yes, and probably also have preempt_disable and preempt_enable
> assembler macros. That's going to get rather icky if we have to
> explicitly call the scheduler though (to solve (1)).

What about a pair of helpers written in C instead?

v7_flush_dcache_all() could be renamed, and a wrapper function called
v7_flush_dcache_all() would call the preemption disable helper, call the
former v7_flush_dcache_all code, then call the preemption enable helper.

Then __v7_setup() could still call the core cache flush code without

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