Subject: linux-next: build failure after merge of the kvm-arm tree

From: Stephen Rothwell <[email-masked]>
Date: Thu, 22 Feb 2024 22:03:49 +1100

Hi all,

After merging the kvm tree, today's linux-next build (arm64 defconfig)
failed like this:

In file included from <command-line>:
In function 'check_res_bits',
    inlined from 'kvm_sys_reg_table_init' at arch/arm64/kvm/sys_regs.c:4109:2:
include/linux/compiler_types.h:449:45: error: call to '__compiletime_assert_591' declared with attribute error: BUILD_BUG_ON failed: ID_AA64DFR1_EL1_RES0 != (GENMASK_ULL(63, 0))
  449 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
      |                                             ^
include/linux/compiler_types.h:430:25: note: in definition of macro '__compiletime_assert'
  430 |                         prefix ## suffix();                             \
      |                         ^~~~~~
include/linux/compiler_types.h:449:9: note: in expansion of macro '_compiletime_assert'
  449 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
      |         ^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
   39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
      |                                     ^~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
   50 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
      |         ^~~~~~~~~~~~~~~~
arch/arm64/kvm/check-res-bits.h:58:9: note: in expansion of macro 'BUILD_BUG_ON'
   58 |         BUILD_BUG_ON(ID_AA64DFR1_EL1_RES0       != (GENMASK_ULL(63, 0)));
      |         ^~~~~~~~~~~~

I bisected this to the merge of the kvm-arm tree into linux-next but I
could not figure out why it fails :-(

-- 
Cheers,
Stephen Rothwell