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Add handling for kernel 4.7's CONFIG_TRIM_UNUSED_KSYMS 

Kernel 4.7 added the option to trim the unused exported symbols. In
my testing this showed to be problematic since the PDE_DATA function
was considered unused and as such was trimmed. This in turn caused the
respective test during spl's configure stage to falsely detect that
PDE_DATA is not defined, which in turn caused build failures later.

Handle this situation by adding detection whether CONFIG_TRIM_UNUSED_KSYMS
is enabled and refuse to build against a kernel which has it enabled

Signed-off-by: Nikolay Borisov <n.borisov.lkml@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #565
This commit is contained in:
Nikolay Borisov 2016-07-29 18:48:33 +03:00 committed by Brian Behlendorf
parent fb83388387
commit 4b9dddf430
1 changed files with 21 additions and 0 deletions
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21
config/spl-build.m4
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@ -24,6 +24,7 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
SPL_AC_ATOMIC_SPINLOCK
SPL_AC_SHRINKER_CALLBACK
SPL_AC_CTL_NAME
SPL_AC_CONFIG_TRIM_UNUSED_KSYMS
SPL_AC_PDE_DATA
SPL_AC_SET_FS_PWD_WITH_CONST
SPL_AC_2ARGS_VFS_UNLINK
@ -1248,6 +1249,26 @@ AC_DEFUN([SPL_AC_CONFIG_ZLIB_DEFLATE], [
])
])
dnl #
dnl # config trim unused symbols,
dnl # Verify the kernel has CONFIG_TRIM_UNUSED_KSYMS DISABLED.
dnl #
AC_DEFUN([SPL_AC_CONFIG_TRIM_UNUSED_KSYMS], [
AC_MSG_CHECKING([whether CONFIG_TRIM_UNUSED_KSYM is disabled])
SPL_LINUX_TRY_COMPILE([
#if defined(CONFIG_TRIM_UNUSED_KSYMS)
#error CONFIG_TRIM_UNUSED_KSYMS not defined
#endif
],[ ],[
AC_MSG_RESULT([yes])
],[
AC_MSG_RESULT([no])
AC_MSG_ERROR([
*** This kernel has unused symbols trimming enabled, please disable.
*** Rebuild the kernel with CONFIG_TRIM_UNUSED_KSYMS=n set.])
])
])
dnl #
dnl # 2.6.39 API compat,
dnl # The function zlib_deflate_workspacesize() now take 2 arguments.