On Tue, 23 Aug 2016 18:31:05 +0200 "Luis R. Rodriguez" <mcgrof@xxxxxxxxxx> wrote: > On Tue, Aug 23, 2016 at 12:11:40AM +0900, Masami Hiramatsu wrote: > > On Fri, 19 Aug 2016 14:34:12 -0700 > > mcgrof@xxxxxxxxxx wrote: > > > > > From: "Luis R. Rodriguez" <mcgrof@xxxxxxxxxx> > > > > > > Often all is needed is these small helpers, instead of compiler.h > > > or a full kprobes.h. This is important for asm helpers, in fact even > > > some asm/kprobes.h make use of these helpers... instead just keep a > > > generic asm file with helpers useful for asm code with the least amount > > > of clutter as possible. > > > > > > Likewise we need now to also address what to do about this file for both > > > when architectures have CONFIG_HAVE_KPROBES, and when they do not. Then > > > for when architectures have CONFIG_HAVE_KPROBES but have disabled > > > CONFIG_KPROBES. > > > > > > Right now most asm/kprobes.h do not have guards against CONFIG_KPROBES, > > > this means most architecture code cannot include asm/kprobes.h safely. > > > Correct this and add guards for architectures missing them. Additionally > > > provide architectures that not have kprobes support with the default > > > asm-generic solution. This lets us force asm/kprobes.h on the header > > > include/linux/kprobes.h always, but most importantly we can now safely > > > include just asm/kprobes.h on architecture code without bringing > > > the full kitchen sink of header files. > > > > > > Two architectures already provided a guard against CONFIG_KPROBES on > > > its kprobes.h: sh, arch. The rest of the architectures needed gaurds > > > added. We avoid including any not-needed headers on asm/kprobes.h > > > unless kprobes have been enabled. > > > > > > In a subsequent atomic change we can try now to remove compiler.h from > > > include/linux/kprobes.h. > > > > Hmm, this looks a bit overkill... I rather like move it into linux/table.h. > > That's the thing, we can't reasonably expect every table to add an entry into > table.h, this should be up to each user. Moving it to tables.h just prolongs > what needs to be done. In this case the change is justifiable given kprobe > annotations are required for some architectures early in architecture code, and > including compiler.h on early architecture code blows up. There is no easy fix > to this, and this this was *actually* the cleanest solution I could devise > without much changes. Aah, I misread your patch, it is asm-generic/kprobes.h, not asm/kprobes.h. I think it is OK now. Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx> Thanks! > > Luis -- Masami Hiramatsu <mhiramat@xxxxxxxxxx> -- 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
