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Message-ID: <op.tf7x1ae18n9ctc@pc-block.esd> Date: Thu, 21 Sep 2006 10:04:12 +0200 From: "Andreas Block" <andreas.block@...-electronics.com> To: linux-kernel@...r.kernel.org Subject: munmap from inside kernel Hi, following scenario: Two linux systems connected via PCI. I'd like to write a driver, which allows to map memory from the remote system into local user space and vice versa. This works quite well utilizing mmap and respective vma_ops. I do have one problem though. When the buffer on the remote side gets destroyed, I'd like to remove the mappings from local user space into this buffer (I do prefer a segfaulting application over an application writing into "I don't know where"). Under kernel 2.4.x I used "do_munmap()" in protection of "mm->mmap_sem" and it seemed to work quite well for me. Now using kernel 2.6.x (I tested 2.6.8 and 2.6.15) this seemingly doesn't work anymore, because I do end up with a crash, when trying to manually unmap the memory. Is there any safe way to "trigger munmap()" from inside the kernel? Best regards, Andreas - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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