On Fri, Oct 17, 2025 at 01:26:41PM +0200, Mikhail Zaslonko wrote: > In s390x_kvtop() early return may take place despite the verbose > flag. Thus we can miss page-table walk information in the vtop output > for kernel virtual addresses. > Make sure that s390x_vtop() is always called for kernel virtual addresses > when the verbose flag is passed to s390x_kvtop() by do_vtop(). > > Suggested-by: Heiko Carstens <hca(a)linux.ibm.com&gt; > Signed-off-by: Mikhail Zaslonko <zaslonko(a)linux.ibm.com&gt; > --- > s390x.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/s390x.c b/s390x.c > index 25dca5e..77d9082 100644 > --- a/s390x.c > +++ b/s390x.c > @@ -943,15 +943,15 @@ s390x_kvtop(struct task_context *tc, ulong vaddr, physaddr_t *paddr, int verbose > > if (!IS_KVADDR(vaddr)){ > *paddr = 0; > return FALSE; > } > > - if (!IS_VMALLOC_ADDR(vaddr)) { > - *paddr = VTOP(vaddr); > - return TRUE; > + if (!verbose && !IS_VMALLOC_ADDR(vaddr)) { > + *paddr = VTOP(vaddr); > + return TRUE; Few other architectures do it like this: if (!vt->vmalloc_start) { *paddr = VTOP(kvaddr); return TRUE; } if (!IS_VMALLOC_ADDR(kvaddr)) { *paddr = VTOP(kvaddr); if (!verbose) return TRUE; } Would it work for s390x?

> } > > pgd_base = (unsigned long)vt->kernel_pgd[0]; > return s390x_vtop(pgd_base, vaddr, paddr, verbose); > } Thanks!