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1de1488fdc
torvalds/linux@8077c0d983 added a __must_check to the bdi_setup_and_register(), which caused our autotools check to break. zfsonlinux/zfs@729210564a was intended to correct that, but it depended on -Wno-unused-result, which is unrecognized in older GCC versions. That commit has been reverted in favor of a solution that does not require -Wno-unused-result. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2102 Closes #2135
23 lines
739 B
Plaintext
23 lines
739 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 avaliable 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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int r = bdi_setup_and_register(NULL, NULL, 0);
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r = *(&r);
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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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