Hello,

test-building the latest rc kernel 5.3-rc5 (-rc4 was fine) resulted in
errors:

==============================================================
CC lib/iomap_copy.o
In file included from ./include/asm-generic/4level-fixup.h:38,
from ./arch/parisc/include/asm/pgtable.h:5,
from ./arch/parisc/include/asm/io.h:6,
from ./include/linux/io.h:13,
from lib/iomap_copy.c:7: ./include/asm-generic/5level-fixup.h:14:18: error: unknown type name 'pgd_t'; did you mean 'pid_t'?
#define p4d_t pgd_t
^~~~~
./include/asm-generic/5level-fixup.h:24:28: note: in expansion of macro 'p4d_t'
static inline int p4d_none(p4d_t p4d)
^~~~~
./include/asm-generic/5level-fixup.h:14:18: error: unknown type name 'pgd_t'; did you mean 'pid_t'?
#define p4d_t pgd_t
^~~~~
./include/asm-generic/5level-fixup.h:29:27: note: in expansion of macro 'p4d_t'
static inline int p4d_bad(p4d_t p4d)
^~~~~
./include/asm-generic/5level-fixup.h:14:18: error: unknown type name 'pgd_t'; did you mean 'pid_t'?
#define p4d_t pgd_t
^~~~~
./include/asm-generic/5level-fixup.h:34:31: note: in expansion of macro 'p4d_t'
static inline int p4d_present(p4d_t p4d)
^~~~~
In file included from ./arch/parisc/include/asm/pgtable.h:583,
from ./arch/parisc/include/asm/io.h:6,
from ./include/linux/io.h:13,
from lib/iomap_copy.c:7:
./include/asm-generic/pgtable.h: In function 'p4d_none_or_clear_bad': ./include/asm-generic/pgtable.h:578:6: error: implicit declaration of function 'p4d_none'; did you mean 'pgd_none'? [-Werror=implicit-function-declaration]
if (p4d_none(*p4d))
^~~~~~~~
pgd_none
In file included from ./include/linux/init.h:5,
from ./include/linux/io.h:10,
from lib/iomap_copy.c:7: ./include/asm-generic/pgtable.h:580:15: error: implicit declaration of function 'p4d_bad'; did you mean 'pgd_bad'? [-Werror=implicit-function-declaration]
if (unlikely(p4d_bad(*p4d))) {
^~~~~~~
./include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
# define unlikely(x) __builtin_expect(!!(x), 0)
^
cc1: some warnings being treated as errors
make[4]: *** [scripts/Makefile.build:281: lib/iomap_copy.o] Error 1
make[4]: *** Waiting for unfinished jobs....
CC net/ipv6/udplite.o
make[3]: *** [Makefile:1083: lib] Error 2
(...)
==============================================================

Before I start debugging, is this already on radar?

Christoph

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