linux-kernel - mux/mmio: randconfig build errors

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Message-ID: <64cf625b-2495-2382-0331-519d1cab0adf@infradead.org>
Date:   Thu, 9 Feb 2023 19:34:19 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Philipp Zabel <p.zabel@...gutronix.de>,
        Peter Rosin <peda@...ntia.se>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: mux/mmio: randconfig build errors

Hi,

The attached i386 config file causes these build errors:

../drivers/mux/mmio.c: In function ‘mux_mmio_probe’:
../drivers/mux/mmio.c:76:34: error: storage size of ‘field’ isn’t known
   76 |                 struct reg_field field;
      |                                  ^~~~~
In file included from ../include/linux/bits.h:21,
                 from ../include/linux/bitops.h:6,
                 from ../drivers/mux/mmio.c:8:
../include/linux/bits.h:23:28: error: first argument to ‘__builtin_choose_expr’ not a constant
   23 |         (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
      |                            ^~~~~~~~~~~~~~~~~~~~~
../include/linux/build_bug.h:16:62: note: in definition of macro ‘BUILD_BUG_ON_ZERO’
   16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
      |                                                              ^
../include/linux/bits.h:37:10: note: in expansion of macro ‘GENMASK_INPUT_CHECK’
   37 |         (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
      |          ^~~~~~~~~~~~~~~~~~~
../drivers/mux/mmio.c:96:29: note: in expansion of macro ‘GENMASK’
   96 |                 if (mask != GENMASK(field.msb, field.lsb)) {
      |                             ^~~~~~~
../include/linux/build_bug.h:16:51: error: bit-field ‘<anonymous>’ width not an integer constant
   16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
      |                                                   ^
../include/linux/bits.h:23:10: note: in expansion of macro ‘BUILD_BUG_ON_ZERO’
   23 |         (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
      |          ^~~~~~~~~~~~~~~~~
../include/linux/bits.h:37:10: note: in expansion of macro ‘GENMASK_INPUT_CHECK’
   37 |         (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
      |          ^~~~~~~~~~~~~~~~~~~
../drivers/mux/mmio.c:96:29: note: in expansion of macro ‘GENMASK’
   96 |                 if (mask != GENMASK(field.msb, field.lsb)) {
      |                             ^~~~~~~
../drivers/mux/mmio.c:102:29: error: implicit declaration of function ‘devm_regmap_field_alloc’ [-Werror=implicit-function-declaration]
  102 |                 fields[i] = devm_regmap_field_alloc(dev, regmap, field);
      |                             ^~~~~~~~~~~~~~~~~~~~~~~
../drivers/mux/mmio.c:76:34: warning: unused variable ‘field’ [-Wunused-variable]
   76 |                 struct reg_field field;
      |                                  ^~~~~

Does anyone have any suggestions for how to resolve this problem
so that an erroneous randconfig file cannot be created?

Thanks.
-- 
~Randy
View attachment "config-i386-mux-mmio-errs" of type "text/plain" (62144 bytes)