[PATCH 02/23] arm64: allow pte_offset_map() to fail
flat view
STALE1235d
SUPERSEDED
From: Hugh Dickins <hughd@google.com>
Date: 2023-05-10 04:44:06
Also in:
linux-m68k, linux-mips, linux-mm, linux-riscv, linux-s390, linux-sh, lkml, sparclinux
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Revision v1 of 2 in this series.
Revisions (2)
- v1 current
- v2 [diff vs current]
In rare transient cases, not yet made possible, pte_offset_map() and pte_offset_map_lock() may not find a page table: handle appropriately. Signed-off-by: Hugh Dickins <hughd@google.com> --- arch/arm64/mm/fault.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 9e0db5c387e3..a58780d5fac4 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c@@ -177,6 +177,9 @@ static void show_pte(unsigned long addr) break; ptep = pte_offset_map(pmdp, addr); + if (!ptep) + break; + pte = READ_ONCE(*ptep); pr_cont(", pte=%016llx", pte_val(pte)); pte_unmap(ptep);
--
2.35.3