summaryrefslogtreecommitdiff
path: root/arch/powerpc/xmon
diff options
context:
space:
mode:
authorHugh Dickins <hughd@google.com>2023-06-08 22:23:35 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-06-20 02:19:08 +0300
commit0c31f29b0cbc11e5bef73681e7e9cbf03ce1acbe (patch)
treef46a942e57c77f5881144d783ef81431929f5b49 /arch/powerpc/xmon
parentd00ae31fa2fc7ce5ed8d60b9fb10adb5c99a792b (diff)
downloadlinux-0c31f29b0cbc11e5bef73681e7e9cbf03ce1acbe.tar.xz
powerpc: allow pte_offset_map[_lock]() to fail
In rare transient cases, not yet made possible, pte_offset_map() and pte_offset_map_lock() may not find a page table: handle appropriately. Balance successful pte_offset_map() with pte_unmap() where omitted. Link: https://lkml.kernel.org/r/54c8b578-ca9-a0f-bfd2-d72976f8d73a@google.com Signed-off-by: Hugh Dickins <hughd@google.com> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alexandre Ghiti <alexghiti@rivosinc.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Chris Zankel <chris@zankel.net> Cc: Claudio Imbrenda <imbrenda@linux.ibm.com> Cc: David Hildenbrand <david@redhat.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: John David Anglin <dave.anglin@bell.net> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Mike Rapoport (IBM) <rppt@kernel.org> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Qi Zheng <zhengqi.arch@bytedance.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch/powerpc/xmon')
-rw-r--r--arch/powerpc/xmon/xmon.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 728d3c257e4a..69447bdf0bcf 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -3376,12 +3376,15 @@ static void show_pte(unsigned long addr)
printf("pmdp @ 0x%px = 0x%016lx\n", pmdp, pmd_val(*pmdp));
ptep = pte_offset_map(pmdp, addr);
- if (pte_none(*ptep)) {
+ if (!ptep || pte_none(*ptep)) {
+ if (ptep)
+ pte_unmap(ptep);
printf("no valid PTE\n");
return;
}
format_pte(ptep, pte_val(*ptep));
+ pte_unmap(ptep);
sync();
__delay(200);