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d67eb17e27
As of kernel v5.8, pin_user_pages* interfaced were introduced. These interfaces use the FOLL_PIN flag. This is preferred interface now for Direct I/O requests in the kernel. The reasoning for using this new interface for Direct I/O requests is explained in the kernel documenetation: Documentation/core-api/pin_user_pages.rst If pin_user_pages_unlocked is available, the all Direct I/O requests will use this new API to stay uptodate with the kernel API requirements. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Brian Atkinson <batkinson@lanl.gov> Closes #16856
34 lines
853 B
Plaintext
34 lines
853 B
Plaintext
dnl #
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dnl # Check for pin_user_pages_unlocked().
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_SRC_PIN_USER_PAGES], [
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ZFS_LINUX_TEST_SRC([pin_user_pages_unlocked], [
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#include <linux/mm.h>
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],[
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unsigned long start = 0;
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unsigned long nr_pages = 1;
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struct page **pages = NULL;
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unsigned int gup_flags = 0;
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long ret __attribute__ ((unused));
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ret = pin_user_pages_unlocked(start, nr_pages, pages,
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gup_flags);
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])
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])
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AC_DEFUN([ZFS_AC_KERNEL_PIN_USER_PAGES], [
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dnl #
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dnl # Kernal 5.8 introduced the pin_user_pages* interfaces which should
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dnl # be used for Direct I/O requests.
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dnl #
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AC_MSG_CHECKING([whether pin_user_pages_unlocked() is available])
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ZFS_LINUX_TEST_RESULT([pin_user_pages_unlocked], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_PIN_USER_PAGES_UNLOCKED, 1,
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[pin_user_pages_unlocked() 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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