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Subject[RFC 01/11] mm: debug: format flags in a buffer
Date
Format various flags to a string buffer rather than printing them. This is
a helper for later.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---
mm/debug.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)

diff --git a/mm/debug.c b/mm/debug.c
index 3eb3ac2..c9f7dd7 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -80,6 +80,41 @@ static void dump_flags(unsigned long flags,
pr_cont(")\n");
}

+static char *format_flags(unsigned long flags,
+ const struct trace_print_flags *names, int count,
+ char *buf, char *end)
+{
+ const char *delim = "";
+ unsigned long mask;
+ int i;
+
+ buf += snprintf(buf, (buf > end ? 0 : end - buf),
+ "flags: %#lx(", flags);
+
+ /* remove zone id */
+ flags &= (1UL << NR_PAGEFLAGS) - 1;
+
+ for (i = 0; i < count && flags; i++) {
+ mask = names[i].mask;
+ if ((flags & mask) != mask)
+ continue;
+
+ flags &= ~mask;
+ buf += snprintf(buf, (buf > end ? 0 : end - buf),
+ "%s%s", delim, names[i].name);
+ delim = "|";
+ }
+
+ /* check for left over flags */
+ if (flags)
+ buf += snprintf(buf, (buf > end ? 0 : end - buf),
+ "%s%#lx", delim, flags);
+
+ buf += snprintf(buf, (buf > end ? 0 : end - buf), ")\n");
+
+ return buf;
+}
+
void dump_page_badflags(struct page *page, const char *reason,
unsigned long badflags)
{
--
1.7.10.4


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