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Map highbit64() to fls64()

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The fls64() function has been available since Linux 2.6.16 and
it should be used to implemented highbit64().  This allows us
to provide an optimized implementation and simplify the code.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf
2014-09-30 18:07:07 -04:00
parent 9c91800d19
commit 87f8055a91
5 changed files with 3 additions and 97 deletions
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config/spl-build.m4
-19
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@@ -30,7 +30,6 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
SPL_AC_CTL_NAME
SPL_AC_VMALLOC_INFO
SPL_AC_PDE_DATA
SPL_AC_FLS64
SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT
SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE
SPL_AC_TIMESPEC_SUB
@@ -993,24 +992,6 @@ AC_DEFUN([SPL_AC_CTL_NAME], [
])
])
dnl #
dnl # 2.6.16 API change.
dnl # Check if 'fls64()' is available
dnl #
AC_DEFUN([SPL_AC_FLS64],
[AC_MSG_CHECKING([whether fls64() is available])
SPL_LINUX_TRY_COMPILE([
#include <linux/bitops.h>
],[
return fls64(0);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FLS64, 1, [fls64() is available])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.26 API change, set_normalized_timespec() is exported.
dnl #