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SubjectRe: [PATCH 07/13] jump label v8: sort jump table at build-time
* Jason Baron (jbaron@redhat.com) wrote:
> On Wed, May 19, 2010 at 03:36:34PM -0700, David Miller wrote:
> > > diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> > > index 2092361..fe6f8be 100644
> > > --- a/scripts/mod/modpost.c
> > > +++ b/scripts/mod/modpost.c
> > > @@ -17,6 +17,8 @@
> > > #include "modpost.h"
> > > #include "../../include/generated/autoconf.h"
> > > #include "../../include/linux/license.h"
> > > +#include <linux/types.h>
> > > +#include "jump_entry.h"
> > >
> >
> > This breaks the build on non-jump_label-supporting architectures
> > because only they will have the jump_entry.h header file.
> >
> > I'm really getting tired trying to test your changes and every single
> > time as I go through doing very basic build testing I always hit one
> > patch that assumes jump label support exists, or assumes some x86'ism.
>
> sorry about that. I mis-tested it. anyways here's the interdiff to this
> patch to fix. btw, how do the sparc bits look?
>
> thanks,
>
> -Jason
>
>
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index fe6f8be..cc87012 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -18,7 +18,9 @@
> #include "../../include/generated/autoconf.h"
> #include "../../include/linux/license.h"
> #include <linux/types.h>
> -#include "jump_entry.h"

includes with "" is a bit unexpected in kernel code. Any reason for this ?
Is jump_entry.h shipped in scripts/mod/ ?

> +#ifdef CONFIG_HAVE_ARCH_JUMP_LABEL

ifdefs everywhere cripples the code and make it unreadable. You might
want to try to find another way to deal with the problem. E.g.

create linux/jump_entry.h
which contains

#ifdef CONFIG_HAVE_ARCH_JUMP_LABEL
#include <asm/jump_entry.h>
#else

define some empty static inlines, and use them in the .c files.

e.g.

static inline void sort_jump_label_table(struct elf_info *info, Elf_Ehdr *hdr)
{
}

#endif

> + #include "jump_entry.h"
> +#endif
>
> /* Some toolchains use a `_' prefix for all user symbols. */
> #ifdef CONFIG_SYMBOL_PREFIX
> @@ -377,6 +379,8 @@ void release_file(void *file, unsigned long size)
> munmap(file, size);
> }
>
> +#ifdef CONFIG_HAVE_ARCH_JUMP_LABEL
> +
> static void swap_jump_label_entries(struct jump_entry *previous, struct jump_entry *next)
> {
> struct jump_entry tmp;
> @@ -421,6 +425,8 @@ static void sort_jump_label_table(struct elf_info *info, Elf_Ehdr *hdr)
> } while (swapped == 1);
> }
>
> +#endif
> +
> static int parse_elf(struct elf_info *info, const char *filename)
> {
> unsigned int i;
> @@ -539,8 +545,10 @@ static int parse_elf(struct elf_info *info, const char *filename)
> sym->st_size = TO_NATIVE(sym->st_size);
> }
>
> +#ifdef CONFIG_HAVE_ARCH_JUMP_LABEL
> if (enable_jump_label)
> sort_jump_label_table(info, hdr);
> +#endif

And remove this ifdef.

Thanks,

Mathieu

>
> return 1;
> }

--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com

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