[LTP] [PATCH v5 4/7] Hugetlb: Safe macro for posix_fadvise call

[Cyril Hrubis]

Hi!
>  include/tst_safe_macros.h | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/include/tst_safe_macros.h b/include/tst_safe_macros.h
> index 81c4b0844..4965e44d0 100644
> --- a/include/tst_safe_macros.h
> +++ b/include/tst_safe_macros.h
> @@ -298,6 +298,23 @@ static inline int safe_ftruncate(const char *file, const int lineno,
>  #define SAFE_FTRUNCATE(fd, length) \
>  	safe_ftruncate(__FILE__, __LINE__, (fd), (length))
>  
> +static inline int safe_posix_fadvise(const char *file, const int lineno,
> +                                int fd, off_t offset, off_t len, int advice)
> +{
> +	int rval;
> +
> +	rval = posix_fadvise(fd, offset, len, advice);
> +
> +	if (rval)
> +		tst_brk_(file, lineno, TBROK | TERRNO,
> +			"posix_fadvise(%d,%ld,%ld,%d) failed",
> +			fd, (long)offset, (long)len, advice);

I did a closer look at the posix_fadvise() manual and it returns an
error in case of a failure, so the TERRNO is wrong here since that
would print whatever was the last error stored in there.

So we either have to do errno = rval; in the if (rval) branch or use
tst_strerrno() to print the errno ourselves.

Looking at the code we have the safe_pthread.c does use tst_strerrno()
to print the error, so I would be inclined to do so here as well.

Also LKML coding style prefers curly braces around multiline blocks, so
I would enclose the multiline tst_brk_() into curly braces, but that is
very minor.

> +	return rval;
> +}
> +#define SAFE_POSIX_FADVISE(fd, offset, len, advice) \
> +	safe_posix_fadvise(__FILE__, __LINE__, (fd), (offset), (len), (advice))
> +
>  static inline int safe_truncate(const char *file, const int lineno,
>                                  const char *path, off_t length)
>  {
> -- 
> 2.31.1
> 

-- 
Cyril Hrubis
chrubis@suse.cz