[PATCH 5/5] vsprintf: Make %pGp print the hex value

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

All existing users of %pGp want the hex value as well as the decoded
flag names.  This looks awkward (passing the same parameter to printf
twice), so move that functionality into the core.  If we want, we
can make that optional with flag arguments to %pGp in the future.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 lib/test_printf.c   | 10 +++++++++-
 lib/vsprintf.c      |  8 ++++++++
 mm/debug.c          |  2 +-
 mm/memory-failure.c |  8 ++++----
 mm/page_owner.c     |  4 ++--
 mm/slub.c           |  4 ++--
 6 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/lib/test_printf.c b/lib/test_printf.c
index 662c3785aa57..a60b1a749e87 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -613,6 +613,10 @@ page_flags_test(int section, int node, int zone, int last_cpupid,
 	bool append = false;
 	int i;
 
+	for (i = 0; i < ARRAY_SIZE(values); i++)
+		page_flags |= (values[i] & pft[i].mask) << pft[i].shift;
+	snprintf(cmp_buf + size, BUF_SIZE - size, "%#lx(", page_flags);
+	size = strlen(cmp_buf);
 	if (flags & PAGEFLAGS_MASK) {
 		snprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
 		size = strlen(cmp_buf);
@@ -628,7 +632,6 @@ page_flags_test(int section, int node, int zone, int last_cpupid,
 			cmp_buf[size] = '\0';
 		}
 
-		page_flags |= (values[i] & pft[i].mask) << pft[i].shift;
 		snprintf(cmp_buf + size, BUF_SIZE - size, "%s=", pft[i].name);
 		size = strlen(cmp_buf);
 		snprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt,
@@ -637,6 +640,11 @@ page_flags_test(int section, int node, int zone, int last_cpupid,
 		append = true;
 	}
 
+	if (size < BUF_SIZE) {
+		cmp_buf[size++] = ')';
+		cmp_buf[size] = '\0';
+	}
+
 	test(cmp_buf, "%pGp", &page_flags);
 }
 
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index d7ad44f2c8f5..214098248610 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -2023,6 +2023,11 @@ char *format_page_flags(char *buf, char *end, unsigned long flags)
 	bool append = false;
 	int i;
 
+	buf = number(buf, end, flags, default_flag_spec);
+	if (buf < end)
+		*buf = '(';
+	buf++;
+
 	/* Page flags from the main area. */
 	if (main_flags) {
 		buf = format_flags(buf, end, main_flags, pageflag_names);
@@ -2051,6 +2056,9 @@ char *format_page_flags(char *buf, char *end, unsigned long flags)
 
 		append = true;
 	}
+	if (buf < end)
+		*buf = ')';
+	buf++;
 
 	return buf;
 }
diff --git a/mm/debug.c b/mm/debug.c
index fae0f81ad831..714be101dec9 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -162,7 +162,7 @@ static void __dump_page(struct page *page)
 out_mapping:
 	BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
 
-	pr_warn("%sflags: %#lx(%pGp)%s\n", type, head->flags, &head->flags,
+	pr_warn("%sflags: %pGp%s\n", type, &head->flags,
 		page_cma ? " CMA" : "");
 	print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32,
 			sizeof(unsigned long), page,
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 3e6449f2102a..e4e122a2e9b1 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2109,14 +2109,14 @@ static int __soft_offline_page(struct page *page)
 			if (!list_empty(&pagelist))
 				putback_movable_pages(&pagelist);
 
-			pr_info("soft offline: %#lx: %s migration failed %d, type %lx (%pGp)\n",
-				pfn, msg_page[huge], ret, page->flags, &page->flags);
+			pr_info("soft offline: %#lx: %s migration failed %d, type %pGp\n",
+				pfn, msg_page[huge], ret, &page->flags);
 			if (ret > 0)
 				ret = -EBUSY;
 		}
 	} else {
-		pr_info("soft offline: %#lx: %s isolation failed, page count %d, type %lx (%pGp)\n",
-			pfn, msg_page[huge], page_count(page), page->flags, &page->flags);
+		pr_info("soft offline: %#lx: %s isolation failed, page count %d, type %pGp\n",
+			pfn, msg_page[huge], page_count(page), &page->flags);
 		ret = -EBUSY;
 	}
 	return ret;
diff --git a/mm/page_owner.c b/mm/page_owner.c
index 62402d22539b..4afc713ca525 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -351,12 +351,12 @@ print_page_owner(char __user *buf, size_t count, unsigned long pfn,
 	pageblock_mt = get_pageblock_migratetype(page);
 	page_mt  = gfp_migratetype(page_owner->gfp_mask);
 	ret += snprintf(kbuf + ret, count - ret,
-			"PFN %lu type %s Block %lu type %s Flags %#lx(%pGp)\n",
+			"PFN %lu type %s Block %lu type %s Flags %pGp\n",
 			pfn,
 			migratetype_names[page_mt],
 			pfn >> pageblock_order,
 			migratetype_names[pageblock_mt],
-			page->flags, &page->flags);
+			&page->flags);
 
 	if (ret >= count)
 		goto err;
diff --git a/mm/slub.c b/mm/slub.c
index 3d2025f7163b..f7ac28646580 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -763,9 +763,9 @@ void print_tracking(struct kmem_cache *s, void *object)
 
 static void print_page_info(struct page *page)
 {
-	pr_err("Slab 0x%p objects=%u used=%u fp=0x%p flags=%#lx(%pGp)\n",
+	pr_err("Slab 0x%p objects=%u used=%u fp=0x%p flags=%pGp\n",
 	       page, page->objects, page->inuse, page->freelist,
-	       page->flags, &page->flags);
+	       &page->flags);
 
 }
 
-- 
2.32.0