linux-kernel - Re: [for-next][PATCH 23/24] string.h: Add strncmp

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Message-ID: <CAHk-=whLFsxr751LsJoxe-E=4LVvh=hB-3MmQTLVRA5mMLHzJA@mail.gmail.com>
Date:   Fri, 21 Dec 2018 14:29:30 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Joe Perches <joe@...ches.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Andreas Schwab <schwab@...ux-m68k.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [for-next][PATCH 23/24] string.h: Add strncmp_prefix() helper macro

On Fri, Dec 21, 2018 at 2:20 PM Joe Perches <joe@...ches.com> wrote:
>
> Using
>
> static inline bool str_has_prefix(const char *str, const char prefix[])
> {
>         return !strncmp(str, prefix, strlen(prefix));
> }
>
> eliminates the strlen with gcc 4.8 (oldest I still have)

Ok, that looks like the right thing to do.

Side note: in the kernel we disable the whole "unsigned vs signed"
pointer warning entirely, exactly because of the "char *" vs "unsigned
char *" problem.

                 Linus