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Date: Tue, 08 Jul 2014 11:51:27 +0900 From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> To: Rusty Russell <rusty@...tcorp.com.au> Cc: Steven Rostedt <rostedt@...dmis.org>, LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Fengguang Wu <fengguang.wu@...el.com> Subject: Re: [PATCH] modules: Fix build error in moduleloader.h (2014/07/08 8:40), Rusty Russell wrote: > Steven Rostedt <rostedt@...dmis.org> writes: >> Fengguang Wu's build bot detected that if moduleloader.h is included in >> a C file (used by ftrace and kprobes to access module_alloc() when >> available), that it can fail to build if CONFIG_MODULES and >> CONFIG_MODULES_USE_ELF_REL is not defined. >> >> This is because there's a printk() that dereferences struct module to >> print the name of the module. But as struct module does not exist when >> CONFIG_MODULES is not defined we get this error: > > First, we have module_name() for exactly this. > > Second, there are two places like this: you hit > CONFIG_MODULES_USE_ELF_REL and not CONFIG_MODULES_USE_ELF_RELA. > > (We could uninline them, and put them in module.c, but I think having > them in the header is nice and self-documenting.) > > So does this work for you? > > Thanks, > Rusty. > PS. Masami Hiramatsu, your review should have caught the second case, > at least :( Oops, sorry, I missed the second one ... and this version seems good to me. Thank you, > > Subject: modules: Fix build error in moduleloader.h > > Fengguang Wu's build bot detected that if moduleloader.h is included in > a C file (used by ftrace and kprobes to access module_alloc() when > available), that it can fail to build if CONFIG_MODULES and > CONFIG_MODULES_USE_ELF_REL is not defined. > > This is because there's a printk() that dereferences struct module to > print the name of the module. But as struct module does not exist when > CONFIG_MODULES is not defined we get this error: > > include/linux/moduleloader.h: In function 'apply_relocate': >>> include/linux/moduleloader.h:48:63: error: dereferencing pointer to >>> incomplete type > printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name); > ^ > Reported-by: kbuild test robot <fengguang.wu@...el.com> > Based-on-the-true-story-by: Steven Rostedt <rostedt@...dmis.org> > Signed-off-by: Rusty Russell <rusty@...tcorp.com.au> > > diff --git a/include/linux/moduleloader.h b/include/linux/moduleloader.h > index 560ca53a75fa..7eeb9bbfb816 100644 > --- a/include/linux/moduleloader.h > +++ b/include/linux/moduleloader.h > @@ -45,7 +45,8 @@ static inline int apply_relocate(Elf_Shdr *sechdrs, > unsigned int relsec, > struct module *me) > { > - printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name); > + printk(KERN_ERR "module %s: REL relocation unsupported\n", > + module_name(me)); > return -ENOEXEC; > } > #endif > @@ -67,7 +68,8 @@ static inline int apply_relocate_add(Elf_Shdr *sechdrs, > unsigned int relsec, > struct module *me) > { > - printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name); > + printk(KERN_ERR "module %s: REL relocation unsupported\n", > + module_name(me)); > return -ENOEXEC; > } > #endif > -- Masami HIRAMATSU Software Platform Research Dept. Linux Technology Research Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: masami.hiramatsu.pt@...achi.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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