On Wed, 20 Feb 2013 10:43:18 -0500 Nicolas Pitre <[email protected]> wrote:
> On Wed, 20 Feb 2013, Woodhouse, David wrote: > > On Wed, 2013-02-20 at 09:06 -0500, Nicolas Pitre wrote: > > > ... in which case there is no harm shipping a .c file and trivially > > > enforcing -O2, the rest being equal. > > > > For today's compilers, unless the wind changes. > > We'll adapt if necessary. Going with -O2 should remain pretty safe anyway. Alas, not so for gcc 4.4 - I had forgotten I had tested Ubuntu/Linaro 4.4.7-1ubuntu2 here: https://patchwork.kernel.org/patch/2101491/ add -O2 to that test script and gcc 4.4 *always* emits calls to __bswap[sd]i2, even with -march=armv6k+. I'll try working on an assembly version given it probably makes more sense, future-gcc-immunity-wise. Otherwise we're back to the old 'if GCC_VERSION >= 40500' in arch/arm/include/asm/swab.h... Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
