On 2015-11-26 00:47, Russell King - ARM Linux wrote: > 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) ? Good point, but I do not think anybody is using CCACHE_HARDLINK with the kernel. As the manpage says, it is going to confuse make, so the time saved by ccache would be offset by make trying to recompile all *.c files each time. Michal -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
