On Mon, Jun 3, 2019 at 7:04 PM Khalid Aziz khalid.aziz@oracle.com wrote:
On 6/3/19 10:55 AM, Andrey Konovalov wrote:
To allow arm64 syscalls to accept tagged pointers from userspace, we must untag them when they are passed to the kernel. Since untagging is done in generic parts of the kernel, the untagged_addr macro needs to be defined for all architectures.
Define it as a noop for architectures other than arm64.
Acked-by: Catalin Marinas catalin.marinas@arm.com Reviewed-by: Khalid Aziz khalid.aziz@oracle.com Signed-off-by: Andrey Konovalov andreyknvl@google.com
include/linux/mm.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h index 0e8834ac32b7..949d43e9c0b6 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -99,6 +99,10 @@ extern int mmap_rnd_compat_bits __read_mostly; #include <asm/pgtable.h> #include <asm/processor.h>
+#ifndef untagged_addr +#define untagged_addr(addr) (addr) +#endif
#ifndef __pa_symbol #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) #endif
Andrey,
This patch has now become part of the other patch series Chris Hellwig has sent out - https://lore.kernel.org/lkml/20190601074959.14036-1-hch@lst.de/. Can you coordinate with that patch series?
Hi!
Yes, I've seen it. How should I coordinate? Rebase this series on top of that one?
Thanks!
-- Khalid