[2.2] compact: workaround for GPL-only symbols on riscv from Linux 6.2 #15767
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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 openzfs#14974 Closes openzfs#15627
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bwatkinson
approved these changes
Jan 12, 2024
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Motivation and Context
#14974 and #15627
Description
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.How Has This Been Tested?
Clean cherry pick from master.