fix locking issues #135
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fix locking issues #135
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Fix the issue further discussed in: 1. https://lore.kernel.org/linux-sgx/op.0rwbv916wjvjmi@mqcpg7oapc828.gar.corp.intel.com/ 2. https://lore.kernel.org/linux-sgx/20201003195440.GD20115@casper.infradead.org/ Reported-by: Haitao Huang <haitao.huang@linux.intel.com> Suggested-by: Matthew Wilcox <willy@infradead.org> Cc: Sean Christopherson <sean.j.christopherson@intel.com> Cc: Jethro Beekman <jethro@fortanix.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Haitao Huang <4699115+haitaohuang@users.noreply.github.com>
mmput_async is required to avoid deadlock, but it is not exported for direct use in some older kernels. Use kallsyms_lookup_name to resolve mmput_async for kernels below 5.4 Note: The mainline kernel does not export it, but newer distro kernels like Ubuntu kernel 5.4 do. Note: The mainline kernel 5.7 and up do not export kallsyms_lookup_name, so this method can't be used for those kernels. Signed-off-by: Haitao Huang <4699115+haitaohuang@users.noreply.github.com>
Signed-off-by: Haitao Huang <4699115+haitaohuang@users.noreply.github.com>
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