From: Andrew Morton <akpm@linux-foundation.org>
To: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: linux-mm@kvack.org, Russell King <linux@arm.linux.org.uk>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 07/16] mm/arm: use vm_flags_t for vma flags
Date: Thu, 22 Mar 2012 14:21:06 -0700 [thread overview]
Message-ID: <20120322142106.3aa383a5.akpm@linux-foundation.org> (raw)
In-Reply-To: <20120321065642.13852.95838.stgit@zurg>
On Wed, 21 Mar 2012 10:56:42 +0400
Konstantin Khlebnikov <khlebnikov@openvz.org> wrote:
> Cast vm_flags to unsigned int for __cpuc_flush_user_range(),
> because its vm_flags argument declared as unsigned int.
> Asssembler code wants to test VM_EXEC bit on vma->vm_flags,
> but for big-endian we should get upper word for this.
>
> ...
>
> --- a/arch/arm/include/asm/cacheflush.h
> +++ b/arch/arm/include/asm/cacheflush.h
> @@ -217,7 +217,7 @@ vivt_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned
> {
> if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm)))
> __cpuc_flush_user_range(start & PAGE_MASK, PAGE_ALIGN(end),
> - vma->vm_flags);
> + (__force unsigned int)vma->vm_flags);
> }
This won't work if a later version of __cpuc_flush_user_range() needs
access to newly-added flags in the upper 32 bits.
I guess we don't have to do anything about it at this stage, and that
if we do ever hit this problem, we'll need to put those newly-added
flags into the lower 32 bits of the vm_flags_t.
--
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next prev parent reply other threads:[~2012-03-22 21:21 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-21 6:56 [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 01/16] mm: introduce NR_VMA_FLAGS Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 02/16] mm: use vm_flags_t for vma flags Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 03/16] mm/shmem: " Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 04/16] mm/nommu: " Konstantin Khlebnikov
2012-03-21 7:08 ` Greg Ungerer
2012-03-21 7:20 ` Konstantin Khlebnikov
2012-03-21 12:01 ` [PATCH v2 " Konstantin Khlebnikov
2012-03-23 6:47 ` Greg Ungerer
2012-03-21 6:56 ` [PATCH 05/16] mm/drivers: " Konstantin Khlebnikov
2012-03-21 10:34 ` Laurent Pinchart
2012-03-21 14:46 ` Greg Kroah-Hartman
2012-03-21 6:56 ` [PATCH 06/16] mm/x86: " Konstantin Khlebnikov
2012-03-21 6:57 ` H. Peter Anvin
2012-03-21 6:56 ` [PATCH 07/16] mm/arm: " Konstantin Khlebnikov
2012-03-22 21:21 ` Andrew Morton [this message]
2012-03-21 6:56 ` [PATCH 08/16] mm/unicore32: " Konstantin Khlebnikov
2012-03-27 3:38 ` Guan Xuetao
2012-03-27 5:58 ` Konstantin Khlebnikov
2012-03-27 7:50 ` Guan Xuetao
2012-03-21 6:56 ` [PATCH 09/16] mm/ia64: " Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 10/16] mm/powerpc: " Konstantin Khlebnikov
2012-03-21 6:56 ` [PATCH 11/16] mm/s390: " Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 12/16] mm/mips: " Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 13/16] mm/parisc: " Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 14/16] mm/score: " Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 15/16] mm: cast vm_flags_t to u64 before printing Konstantin Khlebnikov
2012-03-21 6:57 ` [PATCH 16/16] mm: vm_flags_t strict type checking Konstantin Khlebnikov
2012-03-21 12:11 ` [PATCH v2 " Konstantin Khlebnikov
2012-03-21 10:06 ` [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit Minchan Kim
2012-03-21 13:16 ` Konstantin Khlebnikov
2012-03-22 5:39 ` Minchan Kim
2012-03-22 6:22 ` Benjamin Herrenschmidt
2012-03-24 14:46 ` Konstantin Khlebnikov
2012-03-24 15:00 ` Konstantin Khlebnikov
2012-03-24 23:50 ` Benjamin Herrenschmidt
2012-03-25 7:55 ` Konstantin Khlebnikov
2012-03-22 21:26 ` Andrew Morton
2012-03-22 21:28 ` Al Viro
2012-03-22 21:41 ` Andrew Morton
2012-03-22 21:57 ` Al Viro
2012-03-22 22:05 ` Konstantin Khlebnikov
2012-03-22 22:24 ` Konstantin Khlebnikov
2012-03-22 22:39 ` Linus Torvalds
2012-03-22 22:52 ` Konstantin Khlebnikov
2012-03-22 23:09 ` Andrew Morton
2012-03-23 1:42 ` Al Viro
2012-03-22 22:08 ` Linus Torvalds
2012-03-23 16:19 ` KOSAKI Motohiro
2012-03-30 2:19 ` Al Viro
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