linux-kernel - build error with DEBUG_STRICT_USER_COPY

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Message-ID: <4B3B8F5A.9050601@panasas.com>
Date:	Wed, 30 Dec 2009 19:35:22 +0200
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: build error with DEBUG_STRICT_USER_COPY_CHECKS on at mm/migrate.c:1009

Arjan hi

building with ARCH=i386 allmodconfig will give me the below compilation error.
I'm on FC12 [gcc (GCC) 4.4.2 20091222 (Red Hat 4.4.2-20)]

In file included from arch/x86/include/asm/uaccess.h:571,
                 from include/linux/uaccess.h:5,
                 from include/linux/highmem.h:6,
                 from include/linux/pagemap.h:10,
                 from include/linux/mempolicy.h:62,
                 from include/linux/migrate.h:5,
                 from mm/migrate.c:15:
In function 'copy_from_user',
    inlined from 'do_pages_stat' at mm/migrate.c:1009:
arch/x86/include/asm/uaccess_32.h:213: error: call to 'copy_from_user_overflow' declared with attribute error: copy_from_user() buffer size is not provably correct

un-setting DEBUG_STRICT_USER_COPY_CHECKS, (It was turned on by allmodconfig) will let
the kernel compile.

I thought you might want to know
Boaz

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