Messages in this thread Patch in this message |  | | | Date | Tue, 19 Apr 2011 13:08:45 -0700 | | From | Greg KH <> | | Subject | [36/70] mm/thp: use conventional format for boolean attributes |
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2.6.38-stable review patch. If anyone has any objections, please let us know.
------------------ From: Ben Hutchings <ben@decadent.org.uk>
commit e27e6151b154ff6e5e8162efa291bc60196d29ea upstream.
The conventional format for boolean attributes in sysfs is numeric ("0" or "1" followed by new-line). Any boolean attribute can then be read and written using a generic function. Using the strings "yes [no]", "[yes] no" (read), "yes" and "no" (write) will frustrate this.
[akpm@linux-foundation.org: use kstrtoul()] [akpm@linux-foundation.org: test_bit() doesn't return 1/0, per Neil] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Johannes Weiner <jweiner@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Hugh Dickins <hughd@google.com> Tested-by: David Rientjes <rientjes@google.com> Cc: NeilBrown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- mm/huge_memory.c | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -244,24 +244,28 @@ static ssize_t single_flag_show(struct k struct kobj_attribute *attr, char *buf, enum transparent_hugepage_flag flag) { - if (test_bit(flag, &transparent_hugepage_flags)) - return sprintf(buf, "[yes] no\n"); - else - return sprintf(buf, "yes [no]\n"); + return sprintf(buf, "%d\n", + !!test_bit(flag, &transparent_hugepage_flags)); } + static ssize_t single_flag_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count, enum transparent_hugepage_flag flag) { - if (!memcmp("yes", buf, - min(sizeof("yes")-1, count))) { + unsigned long value; + int ret; + + ret = kstrtoul(buf, 10, &value); + if (ret < 0) + return ret; + if (value > 1) + return -EINVAL; + + if (value) set_bit(flag, &transparent_hugepage_flags); - } else if (!memcmp("no", buf, - min(sizeof("no")-1, count))) { + else clear_bit(flag, &transparent_hugepage_flags); - } else - return -EINVAL; return count; }
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