On Sat, 28 Nov 2015 15:50:09 +0800 Li Bin <huawei.li...@huawei.com> wrote:
> On arm64, kstop_machine which is hugely disruptive to a running > system is not needed to convert nops to ftrace calls or back, > because that modifed code is a single 32bit instructions which > is impossible to cross cache (or page) boundaries, and the used str > instruction is single-copy atomic. Is this really true? I thought that arm (and then perhaps arm64) has some 2 byte instructions. If that's the case it is very well possible that a 4 byte instruction can cross cache lines. -- Steve > > Cc: <sta...@vger.kernel.org> # 3.18+ > Signed-off-by: Li Bin <huawei.li...@huawei.com> > --- > arch/arm64/kernel/ftrace.c | 5 +++++ > 1 files changed, 5 insertions(+), 0 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
