On Wed, 7 Jan 2015, Andrew Morton wrote:
> > OK, I have added this from today
>
> My x86_64 allmodconfig broke.
>
> In file included from include/linux/livepatch.h:29,
> from kernel/livepatch/core.c:30:
> ./arch/x86/include/asm/livepatch.h:29:2: error: #error Your compiler must support -mfentry for live patching to work
[ adding Steven and Masami to CC, as this in some sense is related in
both to ftrace regs caller, and to IPMODIFY users in general ]
Well, if your gcc is too old (which is a fact detemined during build time,
so there is no way to express this in Kconfig language in form of
dependencies), we have to introduce build-time failure, as there is no way
for this to work on compilers that don't support fentry on x86_64.
The only remaining option is to let the code build, pretend that
everything is working, but do something like
#ifndef CC_USING_FENTRY
printk("The compiler you used to compile your kernel was ancient "
"there is no way for you to make use of this feature\n");
return -EINVAL;
#endif
or so ... which I personally detest even more.
--
Jiri Kosina
SUSE Labs
--
To unsubscribe from this list: send the line "unsubscribe linux-next" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
