On Fri, 2023-07-14 at 23:57 +0100, Mark Brown wrote:

On Mon, Jun 12, 2023 at 05:10:27PM -0700, Rick Edgecombe wrote:

quoted

The x86 Shadow stack feature includes a new type of memory called
shadow
stack. This shadow stack memory has some unusual properties, which
requires
some core mm changes to function properly.

This seems to break sparc64_defconfig when applied on top of v6.5-
rc1:

In file included from /home/broonie/git/bisect/include/linux/mm.h:29,
                 from /home/broonie/git/bisect/net/core/skbuff.c:40:
/home/broonie/git/bisect/include/linux/pgtable.h: In function
'pmd_mkwrite':
/home/broonie/git/bisect/include/linux/pgtable.h:528:9: error:
implicit declaration of function 'pmd_mkwrite_novma'; did you mean
'pte_mkwrite_novma'? [-Werror=implicit-function-declaration]
  return pmd_mkwrite_novma(pmd);
         ^~~~~~~~~~~~~~~~~
         pte_mkwrite_novma
/home/broonie/git/bisect/include/linux/pgtable.h:528:9: error:
incompatible types when returning type 'int' but 'pmd_t' {aka 'struct
<anonymous>'} was expected
  return pmd_mkwrite_novma(pmd);
         ^~~~~~~~~~~~~~~~~~~~~~

The same issue seems to apply with the version that was in -next
based
on v6.4-rc4 too.

The version in your branch is not the same as the version in tip (which
had a squashed build fix). I was able to reproduce the build error with
your branch. But not with the one in tip rebased on v6.5-rc1. So can
you try this version:
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/shstk&id=899223d69ce9f338056f4c41ef870d70040fc860