The branch main has been updated by brooks:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=5ea3094e6a755b931d144f30a824e2fed10a8a33

commit 5ea3094e6a755b931d144f30a824e2fed10a8a33
Author:     Brooks Davis <[email protected]>
AuthorDate: 2022-06-13 17:35:40 +0000
Commit:     Brooks Davis <[email protected]>
CommitDate: 2022-06-13 17:35:40 +0000

    amd64: -m32 support for machine/md_var.h
    
    Install the i386 md_var.h under /usr/include/i386 on amd64 and include
    when targeting i386.
    
    This is a mostly kernel-only header required by procstat's ZFS support.
    It is pulled in by the i386 machine/counter.h.
    
    Reviewed by:    jhb, imp
---
 include/i386/Makefile      | 1 +
 sys/amd64/include/md_var.h | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/include/i386/Makefile b/include/i386/Makefile
index 58c619f4dbdf..b5f5a23eb906 100644
--- a/include/i386/Makefile
+++ b/include/i386/Makefile
@@ -15,6 +15,7 @@ INCS= \
 # This should be fixed.
 INCS+= \
        counter.h \
+       md_var.h \
        pcpu.h \
        pcpu_aux.h
 INCSDIR=       ${INCLUDEDIR}/i386
diff --git a/sys/amd64/include/md_var.h b/sys/amd64/include/md_var.h
index 53358600dc79..196836b5baea 100644
--- a/sys/amd64/include/md_var.h
+++ b/sys/amd64/include/md_var.h
@@ -31,6 +31,10 @@
  * $FreeBSD$
  */
 
+#ifdef __i386__
+#include <i386/md_var.h>
+#else /* !__i386__ */
+
 #ifndef _MACHINE_MD_VAR_H_
 #define        _MACHINE_MD_VAR_H_
 
@@ -95,3 +99,5 @@ int   set_fpcontext(struct thread *td, struct __mcontext *mcp,
            char *xfpustate, size_t xfpustate_len);
 
 #endif /* !_MACHINE_MD_VAR_H_ */
+
+#endif /* __i386__ */

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