On 8/20/24 10:31, Linus Torvalds wrote:

On Mon, 19 Aug 2024 at 23:26, Michael Ellerman [off-list ref] wrote:

quoted

Linus Torvalds [off-list ref] writes:

quoted

+static struct vm_special_mapping vdso_mapping = {
+     .name = "[vdso]",
+     .pages = syscall_pages;

                              ^
                              should be ,

Ack. Changed here locally.

Hexagon also has &&vdso_page which I don't understand (but have a toolchain for
somewhere to at least smoketest...)

But I assume you also don't actually test sh...

But I do.

Aside: arch/sh smoketests easily under qemu, here's a relocatable binary toolchain:

  wget https://landley.net/bin/toolchains/latest/sh4-linux-musl-cross.tar.xz
  tar xvf sh4-linux-musl-cross-tar.xz
  CROSS_COMPILE=$PWD/sh4-linux-musl-cross/bin/sh4-linux-musl-

And https://landley.net/bin/mkroot/latest/sh4.tgz is a tiny qemu-system-sh4
system with kernel + initramfs.cpio.gz + run-qemu.sh with the config used to
build it under docs/ and as the first three lines of docs/linux-miniconfig
record, the kernel is arch/sh/boot/zImage.

You can keep the initramfs.cpio.gz and run-qemu.sh and swap out the kernel for a
quick boot to shell prompt under qemu. Serial console is qemu's stdin/stdout,
"exit" to shut down the emulator.

The build script, if you care, is 400 lines of bash:

  https://github.com/landley/toybox/blob/master/mkroot/mkroot.sh

It would be good to get acks from the architectures that still used
the legacy interface.

I'll give arch/sh a whirl. Can somebody answer my above hexagon question?

              Linus

Rob