linux-kernel - Re: [PATCH] Some systems have a dynamic PAGE_SIZE value and do not add a definition for PAGE_SIZE. This value will have to be retrieved using getpagesize() or sysconf().

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Message-Id: <20140806130647.5f94c95c9621dc7d69501641@linux-foundation.org>
Date:	Wed, 6 Aug 2014 13:06:47 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Thierry FAUCK - IBM LTC <thierry@...ux.vnet.ibm.com>
Cc:	avagin@...nvz.org, paulmck@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Some systems have a dynamic PAGE_SIZE value and do not
 add a definition for PAGE_SIZE. This value will have to be retrieved using
 getpagesize() or sysconf().

On Wed,  6 Aug 2014 13:34:26 +0200 Thierry FAUCK - IBM LTC <thierry@...ux.vnet.ibm.com> wrote:

> --- a/tools/testing/selftests/ptrace/peeksiginfo.c
> +++ b/tools/testing/selftests/ptrace/peeksiginfo.c
> @@ -31,6 +31,10 @@ static int sys_ptrace(int request, pid_t pid, void *addr, void *data)
>  #define TEST_SICODE_PRIV	-1
>  #define TEST_SICODE_SHARE	-2
>  
> +#ifndef PAGE_SIZE
> +#define PAGE_SIZE sysconf(_SC_PAGESIZE)
> +#endif
> +
>  #define err(fmt, ...)						\
>  		fprintf(stderr,					\
>  			"Error (%s:%d): " fmt,			\

More details, please.  What are "some systems"?
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