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Cleanup: Make memory barrier definitions consistent across kernels

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We inherited membar_consumer() and membar_producer() from OpenSolaris,
but we had replaced membar_consumer() with Linux's smp_rmb() in
zfs_ioctl.c. The FreeBSD SPL consequently implemented a shim for the
Linux-only smp_rmb().

We reinstate membar_consumer() in platform independent code and fix the
FreeBSD SPL to implement membar_consumer() in a way analogous to Linux.

Reviewed-by: Konstantin Belousov <kib@FreeBSD.org>
Reviewed-by: Mateusz Guzik <mjguzik@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Neal Gompa <ngompa@datto.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Closes #13843
This commit is contained in:
Richard Yao
2022-09-13 19:59:33 -04:00
committed by Tony Hutter
parent 792825724b
commit b247d47be1
4 changed files with 5 additions and 3 deletions
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include/os/linux/spl/sys/vmsystm.h
+2
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@@ -44,7 +44,9 @@
#define zfs_totalhigh_pages totalhigh_pages
#endif
#define membar_consumer() smp_rmb()
#define membar_producer() smp_wmb()
#define physmem zfs_totalram_pages
#define xcopyin(from, to, size) copy_from_user(to, from, size)