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compact: workaround for GPL-only symbols on riscv from Linux 6.2

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Since Linux 6.2, the implementation of flush_dcache_page on riscv
references GPL-only symbol `PageHuge`, breaking the build of zfs.

This patch uses existing mechanism to override flush_dcache_page,
removing the call to `PageHuge`. According to comments in kernel,
it is only used to do some check against HugeTLB pages, which only
exist in userspace. ZFS uses flush_dcache_page only on kernel pages,
thus this patch will not introduce any behaviour change.

See also: torvalds/linux@d33deda, openzfs/zfs@589f59b

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Shengqi Chen <harry-chen@outlook.com>
Closes #14974 
Closes #15627
This commit is contained in:
Shengqi Chen
2023-12-07 04:37:50 +08:00
committed by GitHub
parent 687e4d7f9c
commit 86239a5b9c
3 changed files with 22 additions and 4 deletions
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config/kernel-flush_dcache_page.m4
+3 -2
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@@ -1,7 +1,8 @@
dnl #
dnl # Starting from Linux 5.13, flush_dcache_page() becomes an inline
dnl # function and may indirectly referencing GPL-only cpu_feature_keys on
dnl # powerpc
dnl # function and may indirectly referencing GPL-only symbols:
dnl # on powerpc: cpu_feature_keys
dnl # on riscv: PageHuge (added from 6.2)
dnl #
dnl #