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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[pandora-kernel.git] / Documentation / vm / page-types.c
diff --git a/Documentation/vm/page-types.c b/Documentation/vm/page-types.c
index ea44ea5..66e9358 100644 (file)
--- a/Documentation/vm/page-types.c
+++ b/Documentation/vm/page-types.c
@@ -1,11 +1,22 @@
 /*
  * page-types: Tool for querying page flags
  *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should find a copy of v2 of the GNU General Public License somewhere on
+ * your Linux system; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
  * Copyright (C) 2009 Intel corporation
  *
  * Authors: Wu Fengguang <fengguang.wu@intel.com>
- *
- * Released under the General Public License (GPL).
  */
 
 #define _LARGEFILE64_SOURCE
@@ -100,7 +111,7 @@
 #define BIT(name)              (1ULL << KPF_##name)
 #define BITS_COMPOUND          (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL))
 
-static char *page_flag_names[] = {
+static const char *page_flag_names[] = {
        [KPF_LOCKED]            = "L:locked",
        [KPF_ERROR]             = "E:error",
        [KPF_REFERENCED]        = "R:referenced",
@@ -173,7 +184,7 @@ static int          kpageflags_fd;
 static int             opt_hwpoison;
 static int             opt_unpoison;
 
-static char            *hwpoison_debug_fs = "/debug/hwpoison";
+static const char      hwpoison_debug_fs[] = "/debug/hwpoison";
 static int             hwpoison_inject_fd;
 static int             hwpoison_forget_fd;
 
@@ -560,7 +571,7 @@ static void walk_pfn(unsigned long voffset,
 {
        uint64_t buf[KPAGEFLAGS_BATCH];
        unsigned long batch;
-       unsigned long pages;
+       long pages;
        unsigned long i;
 
        while (count) {
@@ -673,30 +684,35 @@ static void usage(void)
 
        printf(
 "page-types [options]\n"
-"            -r|--raw                  Raw mode, for kernel developers\n"
-"            -a|--addr    addr-spec    Walk a range of pages\n"
-"            -b|--bits    bits-spec    Walk pages with specified bits\n"
-"            -p|--pid     pid          Walk process address space\n"
+"            -r|--raw                   Raw mode, for kernel developers\n"
+"            -d|--describe flags        Describe flags\n"
+"            -a|--addr    addr-spec     Walk a range of pages\n"
+"            -b|--bits    bits-spec     Walk pages with specified bits\n"
+"            -p|--pid     pid           Walk process address space\n"
 #if 0 /* planned features */
-"            -f|--file    filename     Walk file address space\n"
+"            -f|--file    filename      Walk file address space\n"
 #endif
-"            -l|--list                 Show page details in ranges\n"
-"            -L|--list-each            Show page details one by one\n"
-"            -N|--no-summary           Don't show summay info\n"
-"            -X|--hwpoison             hwpoison pages\n"
-"            -x|--unpoison             unpoison pages\n"
-"            -h|--help                 Show this usage message\n"
+"            -l|--list                  Show page details in ranges\n"
+"            -L|--list-each             Show page details one by one\n"
+"            -N|--no-summary            Don't show summay info\n"
+"            -X|--hwpoison              hwpoison pages\n"
+"            -x|--unpoison              unpoison pages\n"
+"            -h|--help                  Show this usage message\n"
+"flags:\n"
+"            0x10                       bitfield format, e.g.\n"
+"            anon                       bit-name, e.g.\n"
+"            0x10,anon                  comma-separated list, e.g.\n"
 "addr-spec:\n"
-"            N                         one page at offset N (unit: pages)\n"
-"            N+M                       pages range from N to N+M-1\n"
-"            N,M                       pages range from N to M-1\n"
-"            N,                        pages range from N to end\n"
-"            ,M                        pages range from 0 to M-1\n"
+"            N                          one page at offset N (unit: pages)\n"
+"            N+M                        pages range from N to N+M-1\n"
+"            N,M                        pages range from N to M-1\n"
+"            N,                         pages range from N to end\n"
+"            ,M                         pages range from 0 to M-1\n"
 "bits-spec:\n"
-"            bit1,bit2                 (flags & (bit1|bit2)) != 0\n"
-"            bit1,bit2=bit1            (flags & (bit1|bit2)) == bit1\n"
-"            bit1,~bit2                (flags & (bit1|bit2)) == bit1\n"
-"            =bit1,bit2                flags == (bit1|bit2)\n"
+"            bit1,bit2                  (flags & (bit1|bit2)) != 0\n"
+"            bit1,bit2=bit1             (flags & (bit1|bit2)) == bit1\n"
+"            bit1,~bit2                 (flags & (bit1|bit2)) == bit1\n"
+"            =bit1,bit2                 flags == (bit1|bit2)\n"
 "bit-names:\n"
        );
 
@@ -884,13 +900,23 @@ static void parse_bits_mask(const char *optarg)
        add_bits_filter(mask, bits);
 }
 
+static void describe_flags(const char *optarg)
+{
+       uint64_t flags = parse_flag_names(optarg, 0);
+
+       printf("0x%016llx\t%s\t%s\n",
+               (unsigned long long)flags,
+               page_flag_name(flags),
+               page_flag_longname(flags));
+}
 
-static struct option opts[] = {
+static const struct option opts[] = {
        { "raw"       , 0, NULL, 'r' },
        { "pid"       , 1, NULL, 'p' },
        { "file"      , 1, NULL, 'f' },
        { "addr"      , 1, NULL, 'a' },
        { "bits"      , 1, NULL, 'b' },
+       { "describe"  , 1, NULL, 'd' },
        { "list"      , 0, NULL, 'l' },
        { "list-each" , 0, NULL, 'L' },
        { "no-summary", 0, NULL, 'N' },
@@ -907,7 +933,7 @@ int main(int argc, char *argv[])
        page_size = getpagesize();
 
        while ((c = getopt_long(argc, argv,
-                               "rp:f:a:b:lLNXxh", opts, NULL)) != -1) {
+                               "rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) {
                switch (c) {
                case 'r':
                        opt_raw = 1;
@@ -924,6 +950,9 @@ int main(int argc, char *argv[])
                case 'b':
                        parse_bits_mask(optarg);
                        break;
+               case 'd':
+                       describe_flags(optarg);
+                       exit(0);
                case 'l':
                        opt_list = 1;
                        break;
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