[PATCH v2 6/6] arm64: update Documentation/arm64/tagged-pointers.txt
DORMANTno replies
From: Andrey Konovalov <hidden>
Date: 2018-05-03 14:15:44
Also in:
linux-doc, linux-mm, lkml
Subsystem:
documentation, the rest · Maintainers:
Jonathan Corbet, Linus Torvalds
Revision v2 of 26 in this series.
Revisions (26)
- rfc [diff vs current]
- v2 [diff vs current]
- v1 [diff vs current]
- v1 [diff vs current]
- v2 current
- v2 [diff vs current]
- v3 [diff vs current]
- v4 [diff vs current]
- v5 [diff vs current]
- v6 [diff vs current]
- v7 [diff vs current]
- v8 [diff vs current]
- v9 [diff vs current]
- v10 [diff vs current]
- v11 [diff vs current]
- v11 [diff vs current]
- v12 [diff vs current]
- v12 [diff vs current]
- v13 [diff vs current]
- v13 [diff vs current]
- v14 [diff vs current]
- v15 [diff vs current]
- v16 [diff vs current]
- v17 [diff vs current]
- v18 [diff vs current]
- v19 [diff vs current]
Add a note that work on passing tagged user pointers to the kernel via syscalls has started, but might not be complete yet. Signed-off-by: Andrey Konovalov <redacted> --- Documentation/arm64/tagged-pointers.txt | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/Documentation/arm64/tagged-pointers.txt b/Documentation/arm64/tagged-pointers.txt
index a25a99e82bb1..361481283f00 100644
--- a/Documentation/arm64/tagged-pointers.txt
+++ b/Documentation/arm64/tagged-pointers.txt@@ -35,8 +35,9 @@ Using non-zero address tags in any of these locations may result in an error code being returned, a (fatal) signal being raised, or other modes of failure. -For these reasons, passing non-zero address tags to the kernel via -system calls is forbidden, and using a non-zero address tag for sp is +Some initial work for supporting non-zero address tags passed to the +kernel via system calls has been done, but the kernel doesn't provide +any guarantees at this point. Using a non-zero address tag for sp is strongly discouraged. Programs maintaining a frame pointer and frame records that use non-zero
--
2.17.0.441.gb46fe60e1d-goog