diff options
author | Dimitry Andric <dim@FreeBSD.org> | 2019-02-04 18:07:03 +0000 |
---|---|---|
committer | Dimitry Andric <dim@FreeBSD.org> | 2019-02-04 18:07:03 +0000 |
commit | 0f166953f72731daca1ddf8311d6e828723ff062 (patch) | |
tree | 8d524ad54d89ebcef230b78e072d7f191af10440 /README.md | |
parent | 2d01f2dee3186137a7cff88d2aa5ee0e7a84e93a (diff) | |
download | src-0f166953f72731daca1ddf8311d6e828723ff062.tar.gz src-0f166953f72731daca1ddf8311d6e828723ff062.zip |
Use NLDT to get number of LDTs on i386
Compiling a GENERIC kernel for i386 with clang 8.0 results in the
following warning:
/usr/src/sys/i386/i386/sys_machdep.c:542:40: error: 'sizeof ((ldt))' will return the size of the pointer, not the array itself [-Werror,-Wsizeof-pointer-div]
nldt = pldt != NULL ? pldt->ldt_len : nitems(ldt);
^~~~~~~~~~~
/usr/src/sys/sys/param.h:299:32: note: expanded from macro 'nitems'
#define nitems(x) (sizeof((x)) / sizeof((x)[0]))
~~~~~~~~~~~ ^
Indeed, 'ldt' is declared as 'union descriptor *', so nitems() is not
the right way to determine the number of LDTs. Instead, the NLDT define
from sys/x86/include/segments.h should be used.
Reviewed by: kib
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D19074
Notes
Notes:
svn path=/head/; revision=343748
Diffstat (limited to 'README.md')
0 files changed, 0 insertions, 0 deletions