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set_thread_area.2: Tweaks after feedback from Andy Lutomirski 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2015-01-30 16:17:57 +01:00
parent ef8db991f1
commit ed26cc5a2e
1 changed files with 6 additions and 3 deletions
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9
man2/set_thread_area.2
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@ -67,7 +67,7 @@ When
.BR set_thread_area ()
is passed an
.I entry_number
of \-1, it finds a free TLS entry.
of \-1, it searches for a free TLS entry.
If
.BR set_thread_area ()
finds a free TLS entry, the value of
@ -137,9 +137,12 @@ This is not normally a problem, as
.BR arch_prctl (2)
is normally used only by 64-bit programs.
.SH BUGS
On 64-bit kernels before Linux 3.19, one of the padding bits in
On 64-bit kernels before Linux 3.19,
.\" commit e30ab185c490e9a9381385529e0fd32f0a399495
one of the padding bits in
.IR user_desc ,
if set, would prevent the descriptor from being considered empty.
if set, would prevent the descriptor from being considered empty (see
.BR modify_ldt (2)).
As a result, the only reliable way to clear a TLS entry is to use
.BR memset (3)
to zero the entire