On Fri, 13 Sept 2024 at 04:47, Charlie Jenkins <charlie@xxxxxxxxxxxx> wrote:
>
> On Thu, Sep 12, 2024 at 06:00:18PM +0800, Chunyan Zhang wrote:
> > When the virtual address range selftest is run on RISC-V platforms,
> > it is observed that using the hint address when calling mmap cannot
> > get the address in the range of that validate_addr() checks, also
> > that will cause '/proc/self/maps' have gaps larger than MAP_CHUNK_SIZE.
> >
> > Signed-off-by: Chunyan Zhang <zhangchunyan@xxxxxxxxxxx>
> > ---
> > tools/testing/selftests/mm/virtual_address_range.c | 9 +++++++++
> > 1 file changed, 9 insertions(+)
> >
> > diff --git a/tools/testing/selftests/mm/virtual_address_range.c b/tools/testing/selftests/mm/virtual_address_range.c
> > index 4e4c1e311247..25f3eb304999 100644
> > --- a/tools/testing/selftests/mm/virtual_address_range.c
> > +++ b/tools/testing/selftests/mm/virtual_address_range.c
> > @@ -64,6 +64,14 @@
> > #define NR_CHUNKS_HIGH NR_CHUNKS_384TB
> > #endif
> >
> > +#if defined(__riscv) && (__riscv_xlen == 64)
> > +static char *hind_addr(void)
>
> This is not a typo by you since this is the name of the original
> function but this should be "hint_addr" right?
Right, didn't notice this typo, let me fix it.
>
> > +{
> > + return NULL;
> > +}
> > +
> > +static void validate_addr(char *ptr, int high_addr) { }
> > +#else
>
> This is something that I am trying to solve over at
> https://lore.kernel.org/lkml/20240905-patches-below_hint_mmap-v3-0-3cd5564efbbb@xxxxxxxxxxxx/
> (the solution is still in flux). Since riscv doesn't currently have this
> behavior of restricting the virtual address space, I think it is more
> reasonable to disable this test entirely. After we have a longer-term
> solution with the patch I have up we can adjust the test and re-enable
> it. What do you think?
That also makes sense, I will send another patch to do that.
Thanks,
Chunyan
>
> - Charlie
>
> > static char *hind_addr(void)
> > {
> > int bits = HIGH_ADDR_SHIFT + rand() % (63 - HIGH_ADDR_SHIFT);
> > @@ -81,6 +89,7 @@ static void validate_addr(char *ptr, int high_addr)
> > if (addr > HIGH_ADDR_MARK)
> > ksft_exit_fail_msg("Bad address %lx\n", addr);
> > }
> > +#endif
> >
> > static int validate_lower_address_hint(void)
> > {
> > --
> > 2.34.1
> >
> >
> > _______________________________________________
> > linux-riscv mailing list
> > linux-riscv@xxxxxxxxxxxxxxxxxxx
> > http://lists.infradead.org/mailman/listinfo/linux-riscv
