[PATCH v6 14/19] x86: mm: Don't display pages which aren't present in debugfs
From: Steven Price <steven.price@arm.com>
Date: 2019-03-26 16:27:32
Also in:
linux-mm, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit), x86 mm · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, Andy Lutomirski, Peter Zijlstra
For the /sys/kernel/debug/page_tables/ files, rather than outputing a mostly empty line when a block of memory isn't present just skip the line. This keeps the output shorter and will help with a future change switching to using the generic page walk code as we no longer care about the 'level' that the page table holes are at. Signed-off-by: Steven Price <steven.price@arm.com> --- arch/x86/mm/dump_pagetables.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index ca270fb00805..e2b53db92c34 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c@@ -304,8 +304,8 @@ static void note_page(struct seq_file *m, struct pg_state *st, /* * Now print the actual finished series */ - if (!st->marker->max_lines || - st->lines < st->marker->max_lines) { + if ((cur & _PAGE_PRESENT) && (!st->marker->max_lines || + st->lines < st->marker->max_lines)) { pt_dump_seq_printf(m, st->to_dmesg, "0x%0*lx-0x%0*lx ", width, st->start_address,
@@ -321,7 +321,8 @@ static void note_page(struct seq_file *m, struct pg_state *st, printk_prot(m, st->current_prot, st->level, st->to_dmesg); } - st->lines++; + if (cur & _PAGE_PRESENT) + st->lines++; /* * We print markers for special areas of address space,
--
2.20.1
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