From: jreiser@bitwagon.com (John Reiser)
To: linux-arm-kernel@lists.infradead.org
Subject: ARM cacheflush syscall with range that spans multiple vma
Date: Sun, 09 Jun 2013 17:05:24 -0700 [thread overview]
Message-ID: <51B51844.9050108@bitwagon.com> (raw)
Why does the ARM cacheflush syscall stop after the lowest vma
which intersects the user-requested range? The range could
span more than one vma having contiguous addresses, such as
two files MAP_SHARED into adjacent pages; or even a region
that contains holes (pages not present.)
The code path in arch/arm/kernel/traps.c is:
arm_syscall():
case NR(cacheflush):
return do_cache_op(regs->ARM_r0, regs->ARM_r1, regs->ARM_r2);
do_cache_op() contains no loop for more than one vma:
vma = find_vma(mm, start);
--
next reply other threads:[~2013-06-10 0:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-10 0:05 John Reiser [this message]
2013-06-10 8:59 ` ARM cacheflush syscall with range that spans multiple vma Russell King - ARM Linux
2013-06-10 9:09 ` Will Deacon
2013-06-10 20:16 ` John Reiser
2013-06-10 23:42 ` Russell King - ARM Linux
2013-06-11 10:11 ` Will Deacon
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