linux-kernel - Re: [PATCH 23/43] tools lib: Adopt skip

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Date:   Tue, 2 Jul 2019 10:46:03 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        André Goddard Rosa <andre.goddard@...il.com>
Subject: Re: [PATCH 23/43] tools lib: Adopt skip_spaces() from the kernel
 sources

Em Tue, Jul 02, 2019 at 02:12:40PM +0200, Jiri Olsa escreveu:
> On Mon, Jul 01, 2019 at 11:25:56PM -0300, Arnaldo Carvalho de Melo wrote:
> > From: Arnaldo Carvalho de Melo <acme@...hat.com>
> > 
> > Same implementation, will be used to replace ad-hoc equivalent code in
> > tools/.
> > 
> > Cc: Adrian Hunter <adrian.hunter@...el.com>
> > Cc: André Goddard Rosa <andre.goddard@...il.com>
> > Cc: Jiri Olsa <jolsa@...nel.org>
> > Cc: Namhyung Kim <namhyung@...nel.org>
> > Link: https://lkml.kernel.org/n/tip-dig691cg9ripvoiprpidthw7@git.kernel.org
> > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> > ---
> >  tools/include/linux/string.h |  4 +++-
> >  tools/lib/string.c           | 14 ++++++++++++++
> >  2 files changed, 17 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tools/include/linux/string.h b/tools/include/linux/string.h
> > index 6c3e2cc274c5..cee239350a6b 100644
> > --- a/tools/include/linux/string.h
> > +++ b/tools/include/linux/string.h
> > @@ -29,4 +29,6 @@ static inline bool strstarts(const char *str, const char *prefix)
> >  	return strncmp(str, prefix, strlen(prefix)) == 0;
> >  }
> >  
> > -#endif /* _LINUX_STRING_H_ */
> > +extern char * __must_check skip_spaces(const char *);
> > +
> > +#endif /* _TOOLS_LINUX_STRING_H_ */
> > diff --git a/tools/lib/string.c b/tools/lib/string.c
> > index 93b3d4b6feac..50d400822bb3 100644
> > --- a/tools/lib/string.c
> > +++ b/tools/lib/string.c
> > @@ -17,6 +17,7 @@
> >  #include <string.h>
> >  #include <errno.h>
> >  #include <linux/string.h>
> > +#include <linux/ctype.h>
> >  #include <linux/compiler.h>
> >  
> >  /**
> > @@ -106,3 +107,16 @@ size_t __weak strlcpy(char *dest, const char *src, size_t size)
> >  	}
> >  	return ret;
> >  }
> > +
> > +/**
> > + * skip_spaces - Removes leading whitespace from @str.
> > + * @str: The string to be stripped.
> > + *
> > + * Returns a pointer to the first non-whitespace character in @str.
> > + */
> > +char *skip_spaces(const char *str)
> > +{
> > +	while (isspace(*str))
> > +		++str;
> > +	return (char *)str;
> > +}
> > -- 
> > 2.20.1
> > 
> 
> this breaks objtool build, because it adds _ctype dependency via isspace call
> patch below fixes it for me

Thanks for  spotting this, I'll have it in my next pull request.

- Arnaldo
 
> jirka
> 
> 
> ---
> diff --git a/tools/objtool/Build b/tools/objtool/Build
> index 749becdf5b90..8dc4f0848362 100644
> --- a/tools/objtool/Build
> +++ b/tools/objtool/Build
> @@ -9,6 +9,7 @@ objtool-y += special.o
>  objtool-y += objtool.o
>  
>  objtool-y += libstring.o
> +objtool-y += libctype.o
>  objtool-y += str_error_r.o
>  
>  CFLAGS += -I$(srctree)/tools/lib
> @@ -17,6 +18,10 @@ $(OUTPUT)libstring.o: ../lib/string.c FORCE
>  	$(call rule_mkdir)
>  	$(call if_changed_dep,cc_o_c)
>  
> +$(OUTPUT)libctype.o: ../lib/ctype.c FORCE
> +	$(call rule_mkdir)
> +	$(call if_changed_dep,cc_o_c)
> +
>  $(OUTPUT)str_error_r.o: ../lib/str_error_r.c FORCE
>  	$(call rule_mkdir)
>  	$(call if_changed_dep,cc_o_c)

-- 

- Arnaldo