705741827a
This patch adds a new autoconf function: ZFS_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. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #851
22 lines
717 B
Plaintext
22 lines
717 B
Plaintext
dnl #
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dnl # 2.6.34 API change
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dnl # The bdi_setup_and_register() helper function is avilable and
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dnl # exported by the kernel. This is a trivial helper function but
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dnl # using it significantly simplifies the code surrounding setting
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dnl # up and tearing down the bdi structure.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER],
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[AC_MSG_CHECKING([whether bdi_setup_and_register() is available])
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ZFS_LINUX_TRY_COMPILE_SYMBOL([
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#include <linux/backing-dev.h>
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], [
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bdi_setup_and_register(NULL, NULL, 0);
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], [bdi_setup_and_register], [mm/backing-dev.c], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_BDI_SETUP_AND_REGISTER, 1,
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[bdi_setup_and_register() is available])
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], [
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AC_MSG_RESULT(no)
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])
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])
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