On Wed, 23 Oct 2019 10:56:18 +0900
Masami Hiramatsu <mhira...@kernel.org> wrote:
> On Mon, 21 Oct 2019 20:30:53 +0300
> Alexey Dobriyan <adobri...@gmail.com> wrote:
>
> > On Mon, Oct 21, 2019 at 05:28:09PM +0900, Masami Hiramatsu wrote:
> > > Currently proc-self-map-files-002.c sets va_max (max test address
> > > of user virtual address) to 4GB, but it is too big for 32bit
> > > arch and 1UL << 32 is overflow on 32bit long.
> > >
> > > Make va_max 1GB on 32bit arch like i386 and arm.
> >
> > > +#if __BITS_PER_LONG == 32
> > > +# define VA_MAX (1UL << 30)
> > > +#elif __BITS_PER_LONG == 64
> > > +# define VA_MAX (1UL << 32)
> > > +#else
> > > +# define VA_MAX 0
> > > +#endif
> > > +
> > > int main(void)
> > > {
> > > const int PAGE_SIZE = sysconf(_SC_PAGESIZE);
> > > - const unsigned long va_max = 1UL << 32;
> > > + const unsigned long va_max = VA_MAX;
> >
> > No, just make it like 1MB unconditionally.
>
> Ah, I sse. BTW, would you mean 1GB?
I understand that 1MB will be good enough, since vm.mmap_min_addr is
64KB by default (except for arm/arm64 which is 32KB).
OK, I'll update and resend.
Thank you,
>
> > This is not intended to cover all address space, just large enough part
> > (larger than reasonable vm.mmap_min_addr)
>
> Then, should we better to check the /proc/sys/vm/mmap_min_addr?
>
> Thank you,
>
> --
> Masami Hiramatsu <mhira...@kernel.org>
--
Masami Hiramatsu <mhira...@kernel.org>
