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Message-Id: <20140210.152150.574073124161003333.davem@davemloft.net> Date: Mon, 10 Feb 2014 15:21:50 -0800 (PST) From: David Miller <davem@...emloft.net> To: ryao@...too.org CC: netdev@...r.kernel.org Subject: Latest version of zero-copy fix So now the patch only tests is_vmalloc_addr(), did you test this version with the situation that triggers the given backtrace? [<ffffffff814878ce>] p9_virtio_zc_request+0x45e/0x510 [<ffffffff814814ed>] p9_client_zc_rpc.constprop.16+0xfd/0x4f0 [<ffffffff814839dd>] p9_client_read+0x15d/0x240 [<ffffffff811c8440>] v9fs_fid_readn+0x50/0xa0 [<ffffffff811c84a0>] v9fs_file_readn+0x10/0x20 [<ffffffff811c84e7>] v9fs_file_read+0x37/0x70 [<ffffffff8114e3fb>] vfs_read+0x9b/0x160 [<ffffffff81153571>] kernel_read+0x41/0x60 [<ffffffff810c83ab>] copy_module_from_fd.isra.34+0xfb/0x180 This is reading from v9fs into a module address. It's going generate the same backtrace with your fix. I don't think the situation was sufficiently explained to Linus. In fact, I didn't see the above backtrace mentioned at all. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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