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vsprintf: Make %pGp print the hex value

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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>
Reviewed-by: Yafang Shao <laoar.shao@gmail.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20211019142621.2810043-6-willy@infradead.org
This commit is contained in:
Matthew Wilcox (Oracle) 2021-10-19 15:26:21 +01:00 committed by Petr Mladek
parent 507f986036
commit 23efd0804c
6 changed files with 24 additions and 11 deletions
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9
lib/test_printf.c
View File

@ -609,10 +609,14 @@ page_flags_test(int section, int node, int zone, int last_cpupid,
char *cmp_buf)
{
unsigned long values[] = {section, node, zone, last_cpupid, kasan_tag};
unsigned long size = 0;
unsigned long size;
bool append = false;
int i;
for (i = 0; i < ARRAY_SIZE(values); i++)
flags |= (values[i] & pft[i].mask) << pft[i].shift;
size = scnprintf(cmp_buf, BUF_SIZE, "%#lx(", flags);
if (flags & PAGEFLAGS_MASK) {
size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
append = true;
@ -625,7 +629,6 @@ page_flags_test(int section, int node, int zone, int last_cpupid,
if (append)
size += scnprintf(cmp_buf + size, BUF_SIZE - size, "|");
flags |= (values[i] & pft[i].mask) << pft[i].shift;
size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s=",
pft[i].name);
size += scnprintf(cmp_buf + size, BUF_SIZE - size, pft[i].fmt,
@ -633,6 +636,8 @@ page_flags_test(int section, int node, int zone, int last_cpupid,
append = true;
}
snprintf(cmp_buf + size, BUF_SIZE - size, ")");
test(cmp_buf, "%pGp", &flags);
}

8
lib/vsprintf.c
View File

@ -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;
}

2
mm/debug.c
View File

@ -160,7 +160,7 @@ 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,

8
mm/memory-failure.c
View File

@ -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;

4
mm/page_owner.c
View File

@ -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;

4
mm/slub.c
View File

@ -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);
}