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Date: Tue, 05 Oct 2021 17:51:31 -0700 From: Joe Perches <joe@...ches.com> To: Randy Dunlap <rdunlap@...radead.org>, Kees Cook <keescook@...omium.org> Cc: Jonathan Corbet <corbet@....net>, Alexey Dobriyan <adobriyan@...il.com>, Nick Desaulniers <ndesaulniers@...gle.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Rasmus Villemoes <linux@...musvillemoes.dk>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, linux-hardening@...r.kernel.org, Miguel Ojeda <miguel.ojeda.sandonis@...il.com> Subject: Re: [PATCH v5] docs: Explain the desired position of function attributes On Tue, 2021-10-05 at 12:15 -0700, Randy Dunlap wrote: > On 10/5/21 10:04 AM, Kees Cook wrote: > > On Tue, Oct 05, 2021 at 08:39:14AM -0700, Joe Perches wrote: > > > On Tue, 2021-10-05 at 08:26 -0700, Kees Cook wrote: > > > > While discussing how to format the addition of various function > > > > attributes, some "unwritten rules" of ordering surfaced[1]. Capture as > > > > close as possible to Linus's preferences for future reference. > > > > +For example, using this function declaration example:: > > > > + > > > > + __init void * __must_check action(enum magic value, size_t size, u8 count, > > > > + char *fmt, ...) __printf(4, 5) __malloc; > > > > > > trivia: almost all fmt declarations should be const char * > > > > Heh, good point! > > > > > > +Note that for a function **definition** (i.e. the actual function body), > > > > +the compiler does not allow function parameter attributes after the > > > > +function parameters. In these cases, they should go after the storage > > > > +class attributes (e.g. note the changed position of ``__printf(4, 5)`` > > > > +below, compared to the **declaration** example above):: > > > > + > > > > + static __always_inline __init __printf(4, 5) void * __must_check action(enum magic value, > > > > + size_t size, u8 count, char *fmt, ...) __malloc > > > > > > here too, and 80 columns? > > > > Kernel standard is now 100. *shrug* > > That's more for exceptions, not the common rule. > AFAIUI. And for function definitions that are not static inline, when separate function declarations exist, the function definition does not need any attribute marking at all.
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