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config/kernel: enforce maximum kernel version, with escape hatch
META lists the maximum kernel version we consider to be fully supported. However, we don't enforce this. Sometimes we ship experimental patches for a newer kernel than we're ready to support or, less often, we compile just fine against a newer kernel. Invariably, something doesn't quite work properly, and it's difficult for users to understand that they're actually running against a kernel that we're not yet ready to support. This commit tries to improve this situation. First, it simply enforces Linux-Maximum, by having configure bail out if you try to compile against a newer version that. Then, it adds the --enable-linux-experimental switch to configure. When supplied, this disables enforcing the maximum version, allowing the user to attempt to build against a kernel with version higher than Linux-Maximum. Finally, if the switch is supplied _and_ configure is run against a higher kernel version, it shows a big warning message when configure finishes, and defines HAVE_LINUX_EXPERIMENTAL for the build. This allows us to add code to modify runtime behaviour as well. Reviewed-by: Robert Evans <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Tony Hutter <[email protected]> Signed-off-by: Rob Norris <[email protected]> Sponsored-by: https://despairlabs.com/sponsor/ Closes #15986
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| Original file line number | Diff line number | Diff line change |
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| # =========================================================================== | ||
| # https://www.gnu.org/software/autoconf-archive/ax_compare_version.html | ||
| # =========================================================================== | ||
| # | ||
| # SYNOPSIS | ||
| # | ||
| # AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], [ACTION-IF-FALSE]) | ||
| # | ||
| # DESCRIPTION | ||
| # | ||
| # This macro compares two version strings. Due to the various number of | ||
| # minor-version numbers that can exist, and the fact that string | ||
| # comparisons are not compatible with numeric comparisons, this is not | ||
| # necessarily trivial to do in a autoconf script. This macro makes doing | ||
| # these comparisons easy. | ||
| # | ||
| # The six basic comparisons are available, as well as checking equality | ||
| # limited to a certain number of minor-version levels. | ||
| # | ||
| # The operator OP determines what type of comparison to do, and can be one | ||
| # of: | ||
| # | ||
| # eq - equal (test A == B) | ||
| # ne - not equal (test A != B) | ||
| # le - less than or equal (test A <= B) | ||
| # ge - greater than or equal (test A >= B) | ||
| # lt - less than (test A < B) | ||
| # gt - greater than (test A > B) | ||
| # | ||
| # Additionally, the eq and ne operator can have a number after it to limit | ||
| # the test to that number of minor versions. | ||
| # | ||
| # eq0 - equal up to the length of the shorter version | ||
| # ne0 - not equal up to the length of the shorter version | ||
| # eqN - equal up to N sub-version levels | ||
| # neN - not equal up to N sub-version levels | ||
| # | ||
| # When the condition is true, shell commands ACTION-IF-TRUE are run, | ||
| # otherwise shell commands ACTION-IF-FALSE are run. The environment | ||
| # variable 'ax_compare_version' is always set to either 'true' or 'false' | ||
| # as well. | ||
| # | ||
| # Examples: | ||
| # | ||
| # AX_COMPARE_VERSION([3.15.7],[lt],[3.15.8]) | ||
| # AX_COMPARE_VERSION([3.15],[lt],[3.15.8]) | ||
| # | ||
| # would both be true. | ||
| # | ||
| # AX_COMPARE_VERSION([3.15.7],[eq],[3.15.8]) | ||
| # AX_COMPARE_VERSION([3.15],[gt],[3.15.8]) | ||
| # | ||
| # would both be false. | ||
| # | ||
| # AX_COMPARE_VERSION([3.15.7],[eq2],[3.15.8]) | ||
| # | ||
| # would be true because it is only comparing two minor versions. | ||
| # | ||
| # AX_COMPARE_VERSION([3.15.7],[eq0],[3.15]) | ||
| # | ||
| # would be true because it is only comparing the lesser number of minor | ||
| # versions of the two values. | ||
| # | ||
| # Note: The characters that separate the version numbers do not matter. An | ||
| # empty string is the same as version 0. OP is evaluated by autoconf, not | ||
| # configure, so must be a string, not a variable. | ||
| # | ||
| # The author would like to acknowledge Guido Draheim whose advice about | ||
| # the m4_case and m4_ifvaln functions make this macro only include the | ||
| # portions necessary to perform the specific comparison specified by the | ||
| # OP argument in the final configure script. | ||
| # | ||
| # LICENSE | ||
| # | ||
| # Copyright (c) 2008 Tim Toolan <[email protected]> | ||
| # | ||
| # Copying and distribution of this file, with or without modification, are | ||
| # permitted in any medium without royalty provided the copyright notice | ||
| # and this notice are preserved. This file is offered as-is, without any | ||
| # warranty. | ||
|
|
||
| #serial 13 | ||
|
|
||
| dnl ######################################################################### | ||
| AC_DEFUN([AX_COMPARE_VERSION], [ | ||
| AC_REQUIRE([AC_PROG_AWK]) | ||
| # Used to indicate true or false condition | ||
| ax_compare_version=false | ||
| # Convert the two version strings to be compared into a format that | ||
| # allows a simple string comparison. The end result is that a version | ||
| # string of the form 1.12.5-r617 will be converted to the form | ||
| # 0001001200050617. In other words, each number is zero padded to four | ||
| # digits, and non digits are removed. | ||
| AS_VAR_PUSHDEF([A],[ax_compare_version_A]) | ||
| A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \ | ||
| -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \ | ||
| -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \ | ||
| -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \ | ||
| -e 's/[[^0-9]]//g'` | ||
| AS_VAR_PUSHDEF([B],[ax_compare_version_B]) | ||
| B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \ | ||
| -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \ | ||
| -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \ | ||
| -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \ | ||
| -e 's/[[^0-9]]//g'` | ||
| dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary | ||
| dnl # then the first line is used to determine if the condition is true. | ||
| dnl # The sed right after the echo is to remove any indented white space. | ||
| m4_case(m4_tolower($2), | ||
| [lt],[ | ||
| ax_compare_version=`echo "x$A | ||
| x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"` | ||
| ], | ||
| [gt],[ | ||
| ax_compare_version=`echo "x$A | ||
| x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"` | ||
| ], | ||
| [le],[ | ||
| ax_compare_version=`echo "x$A | ||
| x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"` | ||
| ], | ||
| [ge],[ | ||
| ax_compare_version=`echo "x$A | ||
| x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"` | ||
| ],[ | ||
| dnl Split the operator from the subversion count if present. | ||
| m4_bmatch(m4_substr($2,2), | ||
| [0],[ | ||
| # A count of zero means use the length of the shorter version. | ||
| # Determine the number of characters in A and B. | ||
| ax_compare_version_len_A=`echo "$A" | $AWK '{print(length)}'` | ||
| ax_compare_version_len_B=`echo "$B" | $AWK '{print(length)}'` | ||
| # Set A to no more than B's length and B to no more than A's length. | ||
| A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"` | ||
| B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"` | ||
| ], | ||
| [[0-9]+],[ | ||
| # A count greater than zero means use only that many subversions | ||
| A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"` | ||
| B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"` | ||
| ], | ||
| [.+],[ | ||
| AC_WARNING( | ||
| [invalid OP numeric parameter: $2]) | ||
| ],[]) | ||
| # Pad zeros at end of numbers to make same length. | ||
| ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`" | ||
| B="$B`echo $A | sed 's/./0/g'`" | ||
| A="$ax_compare_version_tmp_A" | ||
| # Check for equality or inequality as necessary. | ||
| m4_case(m4_tolower(m4_substr($2,0,2)), | ||
| [eq],[ | ||
| test "x$A" = "x$B" && ax_compare_version=true | ||
| ], | ||
| [ne],[ | ||
| test "x$A" != "x$B" && ax_compare_version=true | ||
| ],[ | ||
| AC_WARNING([invalid OP parameter: $2]) | ||
| ]) | ||
| ]) | ||
| AS_VAR_POPDEF([A])dnl | ||
| AS_VAR_POPDEF([B])dnl | ||
| dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE. | ||
| if test "$ax_compare_version" = "true" ; then | ||
| m4_ifvaln([$4],[$4],[:])dnl | ||
| m4_ifvaln([$5],[else $5])dnl | ||
| fi | ||
| ]) dnl AX_COMPARE_VERSION |
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@@ -87,3 +87,5 @@ AC_CONFIG_FILES([ | |
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| AC_OUTPUT | ||
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| ZFS_AC_KERNEL_VERSION_WARNING | ||