723aa3b0c2
This patch adds a new autoconf function: SPL_LINUX_TRY_COMPILE_SYMBOL. This new function does the following: - Call LINUX_TRY_COMPILE with the specified parameters. - If unsuccessful, return false. - If successful and we're configuring with --enable-linux-builtin, return true. - Else, call CHECK_SYMBOL_EXPORT with the specified parameters and return the result. All calls to CHECK_SYMBOL_EXPORT are converted to LINUX_TRY_COMPILE_SYMBOL so that the tests work even when configuring for builtin on a kernel which doesn't have loadable module support, or hasn't been built yet. The only exception are: - AC_GET_VMALLOC_INFO, because we don't even have a public header to include in the test case, but that's okay considering this symbol can be ignored just fine. - SPL_AC_DEVICE_CREATE, which is legacy API for 2.6.18 kernels. Since kernels this old are no longer supported it should arguably just be removed entirely from the build system. Note that we're also checking for the correct prototype with an actual call, which was not the case with CHECK_SYMBOL_EXPORT. However, for "complicated" test cases like with multiple symbol versions (e.g. vfs_fsync), we stick with the original behavior and only check for the function's existence. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue zfsonlinux/zfs#851
The Solaris Porting Layer (SPL) is a Linux kernel module which provides many of the Solaris kernel APIs. This shim layer makes it possible to run Solaris kernel code in the Linux kernel with relatively minimal modification. This can be particularly useful when you want to track upstream Solaris development closely and don’t want the overhead of maintaining a large patch which converts Solaris primitives to Linux primitives.
To build packages for your distribution:
$ ./configure
$ make pkg
Full documentation for building, configuring, and using the SPL can be found at: http://zfsonlinux.org