On Thu, 2019-09-12 at 13:49:42 UTC, Christophe Leroy wrote:

Modify back __set_fixmap() to using __fix_to_virt() instead
of fix_to_virt() otherwise the following happens because it
seems GCC doesn't see idx as a builtin const.

  CC      mm/early_ioremap.o
In file included from ./include/linux/kernel.h:11:0,
                 from mm/early_ioremap.c:11:
In function ���fix_to_virt���,
    inlined from ���__set_fixmap��� at ./arch/powerpc/include/asm/fixmap.h:87:2,
    inlined from ���__early_ioremap��� at mm/early_ioremap.c:156:4:
./include/linux/compiler.h:350:38: error: call to ���__compiletime_assert_32��� declared with attribute error: BUILD_BUG_ON failed: idx >= __end_of_fixed_addresses
  _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                      ^
./include/linux/compiler.h:331:4: note: in definition of macro ���__compiletime_assert���
    prefix ## suffix();    \
    ^
./include/linux/compiler.h:350:2: note: in expansion of macro ���_compiletime_assert���
  _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
  ^
./include/linux/build_bug.h:39:37: note: in expansion of macro ���compiletime_assert���
 #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                     ^
./include/linux/build_bug.h:50:2: note: in expansion of macro ���BUILD_BUG_ON_MSG���
  BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
  ^
./include/asm-generic/fixmap.h:32:2: note: in expansion of macro ���BUILD_BUG_ON���
  BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
  ^

Signed-off-by: Christophe Leroy <redacted>
Fixes: 4cfac2f9c7f1 ("powerpc/mm: Simplify __set_fixmap()")

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/77693a5fb57be4606a6024ec8e3076f9499b906b

cheers