D31285.id92676.diff
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	Index: sys/compat/linux/linux.h
	===================================================================
	--- sys/compat/linux/linux.h
	+++ sys/compat/linux/linux.h
	@@ -113,6 +113,7 @@
	/* sigaltstack */
	#define LINUX_SS_ONSTACK 1
	#define LINUX_SS_DISABLE 2
	+#define LINUX_SS_AUTODISARM 0x80000000

	int linux_to_bsd_sigaltstack(int lsa);
	int bsd_to_linux_sigaltstack(int bsa);
	Index: sys/compat/linux/linux.c
	===================================================================
	--- sys/compat/linux/linux.c
	+++ sys/compat/linux/linux.c
	@@ -188,6 +188,12 @@

	if (lsa & LINUX_SS_DISABLE)
	bsa \|= SS_DISABLE;
	+ if (lsa & LINUX_SS_AUTODISARM) {
	+ /*
	+ * XXX: We should be returning EINVAL instead.
	+ */
	+ linux_msg(curthread, "unsupported SS_AUTODISARM");
	+ }
	/*
	* Linux ignores SS_ONSTACK flag for ss
	* parameter while FreeBSD prohibits it.