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* Linux 5.15 compat: standalone <linux/stdarg.h>Alexander2021-09-081-0/+32
Kernel commits 39f75da7bcc8 ("isystem: trim/fixup stdarg.h and other headers") c0891ac15f04 ("isystem: ship and use stdarg.h") 564f963eabd1 ("isystem: delete global -isystem compile option") (for now can be found in linux-next.git tree, will land into the Linus' tree during the ongoing 5.15 cycle with one of akpm merges) removed the -isystem flag and disallowed the inclusion of any compiler header files. They also introduced a minimal <linux/stdarg.h> as a replacement for <stdarg.h>. include/os/linux/spl/sys/cmn_err.h in the ZFS source tree includes <stdarg.h> unconditionally. Introduce a test for <linux/stdarg.h> and include it instead of the compiler's one to prevent module build breakage. Reviewed-by: Tony Nguyen <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Alexander Lobakin <[email protected]> Closes #12531