linux-kernel - [RFC 02/11] mm: debug: deal with a new family of MM pointers

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Date:	Tue, 14 Apr 2015 16:56:24 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, kirill@...temov.name, linux-mm@...ck.org
Subject: [RFC 02/11] mm: debug: deal with a new family of MM pointers

This teaches our printing functions about a new family of MM pointer that it
could now print.

I've picked %pZ because %pm and %pM were already taken, so I figured it
doesn't really matter what we go with. We also have the option of stealing
one of those two...

Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
---
 lib/vsprintf.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 8243e2f..809d19d 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1375,6 +1375,16 @@ char *comm_name(char *buf, char *end, struct task_struct *tsk,
 	return string(buf, end, name, spec);
 }
 
+static noinline_for_stack
+char *mm_pointer(char *buf, char *end, struct task_struct *tsk,
+		struct printf_spec spec, const char *fmt)
+{
+	switch (fmt[1]) {
+	}
+
+	return buf;
+}
+
 int kptr_restrict __read_mostly;
 
 /*
@@ -1463,6 +1473,7 @@ int kptr_restrict __read_mostly;
  *        (legacy clock framework) of the clock
  * - 'Cr' For a clock, it prints the current rate of the clock
  * - 'T' task_struct->comm
+ * - 'Z' Outputs a readable version of a type of memory management struct.
  *
  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
  * function pointers are really function descriptors, which contain a
@@ -1615,6 +1626,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 				   spec, fmt);
 	case 'T':
 		return comm_name(buf, end, ptr, spec, fmt);
+	case 'Z':
+		return mm_pointer(buf, end, ptr, spec, fmt);
 	}
 	spec.flags |= SMALL;
 	if (spec.field_width == -1) {
-- 
1.7.10.4

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