[src/trunk]: src/external/bsd/jemalloc/include/jemalloc/internal Correct and ...

[rin <rin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b56c22700551
branches:  trunk
changeset: 957922:b56c22700551
user:      rin <rin%NetBSD.org@localhost>
date:      Wed Dec 16 01:20:19 2020 +0000

description:
Correct and extend comments on VA for alpha. No binary changes.

diffstat:

 external/bsd/jemalloc/include/jemalloc/internal/jemalloc_internal_defs.h |  9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diffs (19 lines):

diff -r 124bf1c8190c -r b56c22700551 external/bsd/jemalloc/include/jemalloc/internal/jemalloc_internal_defs.h
--- a/external/bsd/jemalloc/include/jemalloc/internal/jemalloc_internal_defs.h  Tue Dec 15 21:19:47 2020 +0000
+++ b/external/bsd/jemalloc/include/jemalloc/internal/jemalloc_internal_defs.h  Wed Dec 16 01:20:19 2020 +0000
@@ -48,7 +48,14 @@
 #ifdef _LP64
 /* XXX: I will take care of this later */
 # ifdef __alpha__
-#  define LG_VADDR 43  /* bit 42 indicates direct map, 42--63 are same */
+/*
+ * Bit 42 indicates kernel space. Bits 42--63 must be same. For user space,
+ * VA can be regarded to have 43 significant bits with sign-extension to
+ * 64 bits. ``Negative'' addresses are not used in this case. Alternatively,
+ * VA can also be regarded to have 42 significant bits with zero-extension.
+ * See rtree_leaf_elm_bits_extent_get() in rtree.h for more details.
+ */
+#  define LG_VADDR 43
 # else
 #  define LG_VADDR 48
 # endif