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add comments explaining the point of SVf_PROTECT
authorDavid Mitchell <davem@iabyn.com>
Thu, 24 Nov 2016 14:42:27 +0000 (14:42 +0000)
committerDavid Mitchell <davem@iabyn.com>
Thu, 24 Nov 2016 14:42:27 +0000 (14:42 +0000)
commitcc25b9e2d291fedac80973dc493e321d31d3cb1a
tree57fdf5406f59dbdfc635098d641eb2f067e5cea6
parent1cafb023c42b2724c2d2fe32a64b6fe43fe7f0c2
add comments explaining the point of SVf_PROTECT

The flag was added by v5.21.4-17-ga623f89, but outside of the commit
message itself, there didn't seem to be any explanation for this flag.
sv.h