Re: [PATCH v2 1/2] scripts: Add a recorduidiv program

Russell King - ARM Linux
2015-11-25T23:47:29Z

On Wed, Nov 25, 2015 at 01:51:03PM -0800, Stephen Boyd wrote:
> The ARM compiler inserts calls to __aeabi_uidiv() and
> __aeabi_idiv() when it needs to perform division on signed and
> unsigned integers. If a processor has support for the udiv and
> sdiv division instructions the calls to these support routines
> can be replaced with those instructions. Therefore, record the
> location of calls to these library functions into two sections
> (one for udiv and one for sdiv) similar to how we trace calls to
> mcount. When the kernel boots up it will check to see if the
> processor supports the instructions and then patch the call sites
> with the instruction.

Do we have any resolution on these programs which modify the object
files in-place, rather than breaking any hard-links which may be
present (eg, as a result of using ccache in hard-link mode) ?

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