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    SubjectRe: [PATCH 25/25] x86, pkeys: Documentation
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    On 09/28/2015 01:34 PM, Andi Kleen wrote:
    > Do you have a manpage for the new syscall too?

    Yep, I just added it to the mprotect() manpage.
    diff --git a/man2/mprotect.2 b/man2/mprotect.2
    index ae305f6..5ba6c58 100644
    --- a/man2/mprotect.2
    +++ b/man2/mprotect.2
    @@ -38,16 +38,19 @@
    .\"
    .TH MPROTECT 2 2015-07-23 "Linux" "Linux Programmer's Manual"
    .SH NAME
    -mprotect \- set protection on a region of memory
    +mprotect, mprotect_key \- set protection on a region of memory
    .SH SYNOPSIS
    .nf
    .B #include <sys/mman.h>
    .sp
    .BI "int mprotect(void *" addr ", size_t " len ", int " prot );
    +.BI "int mprotect_key(void *" addr ", size_t " len ", int " prot , " unsigned long " key);
    .fi
    .SH DESCRIPTION
    .BR mprotect ()
    -changes protection for the calling process's memory page(s)
    +and
    +.BR mprotect_key ()
    +change protection for the calling process's memory page(s)
    containing any part of the address range in the
    interval [\fIaddr\fP,\ \fIaddr\fP+\fIlen\fP\-1].
    .I addr
    @@ -74,10 +77,18 @@ The memory can be modified.
    .TP
    .B PROT_EXEC
    The memory can be executed.
    +.PP
    +.I key
    +is the protection or storage key to assign to the memory.
    +The number of keys supported is dependent on the architecture
    +and is always at least one.
    +The default key is 0.
    .SH RETURN VALUE
    On success,
    .BR mprotect ()
    -returns zero.
    +and
    +.BR mprotect_key ()
    +return zero.
    On error, \-1 is returned, and
    .I errno
    is set appropriately.
    \
     
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