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Re: [PATCH v2] [BZ #10283] localedef: align fixed maps to SHMLBA
- From: David Miller <davem at davemloft dot net>
- To: roland at hack dot frob dot com
- Cc: vapier at gentoo dot org, libc-alpha at sourceware dot org
- Date: Tue, 28 May 2013 13:07:21 -0700 (PDT)
- Subject: Re: [PATCH v2] [BZ #10283] localedef: align fixed maps to SHMLBA
- References: <1369327649-906-1-git-send-email-vapier at gentoo dot org> <1369507293-19498-1-git-send-email-vapier at gentoo dot org> <20130528194042 dot 1EF7B2C074 at topped-with-meat dot com>
From: Roland McGrath <roland@hack.frob.com>
Date: Tue, 28 May 2013 12:40:42 -0700 (PDT)
> The fact that SHMLBA is the right size for this is a Linuxism. It should
> not be used directly in generic libc code. Instead, add a private sysdeps/
> header to define a macro or function that yields this larger-than-page size
> and explains what uses need to use this size. If it's then the most
> sensible thing for a machine-independent linux/ implementation of this
> header to use SHMLBA, then fine.
Solaris has this restriction, for the same exact reason, too, it's not
a Linux'ism.
Anyone OS which properly supports avoidance illegal cache aliases (and
thus, memory corruption) will need to impose this restriction.