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589f59b52a
Linux since 4.7 makes interface 'cpu_has_feature' to use jump labels on powerpc if CONFIG_JUMP_LABEL_FEATURE_CHECKS is enabled, in this case however the inline function references GPL-only symbol 'cpu_feature_keys'. ZFS currently uses 'cpu_has_feature' either directly or indirectly from several places; while it is unknown how this issue didn't break ZFS on 64-bit little-endian powerpc, it is known to break ZFS with many Linux versions on both 32-bit and 64-bit big-endian powerpc. Until this issue is fixed in Linux, we have to workaround it by overriding affected inline functions without depending on 'cpu_feature_keys'. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: WHR <msl0000023508@gmail.com> Closes #14590
27 lines
728 B
Plaintext
27 lines
728 B
Plaintext
dnl #
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dnl # Starting from Linux 5.13, flush_dcache_page() becomes an inline
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dnl # function and may indirectly referencing GPL-only cpu_feature_keys on
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dnl # powerpc
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dnl #
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dnl #
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dnl # Checking if flush_dcache_page is exported GPL-only
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_SRC_FLUSH_DCACHE_PAGE], [
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ZFS_LINUX_TEST_SRC([flush_dcache_page], [
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#include <asm/cacheflush.h>
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], [
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flush_dcache_page(0);
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], [], [ZFS_META_LICENSE])
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])
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AC_DEFUN([ZFS_AC_KERNEL_FLUSH_DCACHE_PAGE], [
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AC_MSG_CHECKING([whether flush_dcache_page() is GPL-only])
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ZFS_LINUX_TEST_RESULT([flush_dcache_page_license], [
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AC_MSG_RESULT(no)
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], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_FLUSH_DCACHE_PAGE_GPL_ONLY, 1,
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[flush_dcache_page() is GPL-only])
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])
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])
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