UPSTREAM: arm64: ptdump: Indicate whether memory should be faulting

With CONFIG_DEBUG_PAGEALLOC, pages do not have the valid bit
set when free in the buddy allocator. Add an indiciation to
the page table dumping code that the valid bit is not set,
'F' for fault, to make this easier to understand.

Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Laura Abbott <labbott@fedoraproject.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 30369029
Patchset: kaslr-arm64-4.4

(cherry picked from commit d7e9d59494a9a5d83274f5af2148b82ca22dff3f)
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Change-Id: I7e8200549e22cb3a01b5e827bf12b872b9cefc58

diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c
index 0adbebbc28037110afd911a5cfe14693101e19ea..0841b2bf0e6ae8885150949c21188ee032f55913 100644 (file)
--- a/arch/arm64/mm/dump.c
+++ b/arch/arm64/mm/dump.c
@@ -90,6 +90,11 @@ struct prot_bits {
 
 static const struct prot_bits pte_bits[] = {
        {
+               .mask   = PTE_VALID,
+               .val    = PTE_VALID,
+               .set    = " ",
+               .clear  = "F",
+       }, {
                .mask   = PTE_USER,
                .val    = PTE_USER,
                .set    = "USR",