selftests ublk UBLK_IO_F_NEED_REG_BUF undeclared

17 Jun 2025


      The following build warnings / errors noticed while building the selftest/ublk
with gcc-13 and clang-nightly toolchains on Linux next tree.
Please suggest if I am missing something in my build setup.
Regressions found on arm arm64 x86_64
  -  selftests ublk
Regression Analysis:
 - New regression? Yes
 - Reproducibility? Yes
Build regression: selftests ublk UBLK_IO_F_NEED_REG_BUF undeclared
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
## Build log
CC       kublk
In file included from kublk.c:6:
kublk.h: In function 'ublk_io_auto_zc_fallback':
kublk.h:240:35: error: 'UBLK_IO_F_NEED_REG_BUF' undeclared (first use
in this function); did you mean 'UBLKSRV_NEED_REG_BUF'?
  240 |         return !!(iod->op_flags & UBLK_IO_F_NEED_REG_BUF);
      |                                   ^~~~~~~~~~~~~~~~~~~~~~
      |                                   UBLKSRV_NEED_REG_BUF
kublk.h:240:35: note: each undeclared identifier is reported only once
for each function it appears in
kublk.c: In function 'ublk_ctrl_update_size':
kublk.c:223:27: error: 'UBLK_U_CMD_UPDATE_SIZE' undeclared (first use
in this function)
  223 |                 .cmd_op = UBLK_U_CMD_UPDATE_SIZE,
      |                           ^~~~~~~~~~~~~~~~~~~~~~
kublk.c: In function 'ublk_ctrl_quiesce_dev':
kublk.c:235:27: error: 'UBLK_U_CMD_QUIESCE_DEV' undeclared (first use
in this function); did you mean 'UBLK_U_CMD_DEL_DEV'?
  235 |                 .cmd_op = UBLK_U_CMD_QUIESCE_DEV,
      |                           ^~~~~~~~~~~~~~~~~~~~~~
      |                           UBLK_U_CMD_DEL_DEV
kublk.c: In function 'ublk_queue_init':
kublk.c:447:63: error: 'UBLK_F_AUTO_BUF_REG' undeclared (first use in
this function); did you mean 'UBLKSRV_AUTO_BUF_REG'?
  447 |         if (dev->dev_info.flags & (UBLK_F_SUPPORT_ZERO_COPY |
UBLK_F_AUTO_BUF_REG)) {
      |
^~~~~~~~~~~~~~~~~~~
      |
UBLKSRV_AUTO_BUF_REG
kublk.c: In function 'ublk_thread_init':
kublk.c:507:63: error: 'UBLK_F_AUTO_BUF_REG' undeclared (first use in
this function); did you mean 'UBLKSRV_AUTO_BUF_REG'?
  507 |         if (dev->dev_info.flags & (UBLK_F_SUPPORT_ZERO_COPY |
UBLK_F_AUTO_BUF_REG)) {
      |
^~~~~~~~~~~~~~~~~~~
      |
UBLKSRV_AUTO_BUF_REG
kublk.c: In function 'ublk_set_auto_buf_reg':
kublk.c:579:16: error: variable 'buf' has initializer but incomplete type
  579 |         struct ublk_auto_buf_reg buf = {};
      |                ^~~~~~~~~~~~~~~~~
kublk.c:579:34: error: storage size of 'buf' isn't known
  579 |         struct ublk_auto_buf_reg buf = {};
      |                                  ^~~
kublk.c:587:29: error: 'UBLK_AUTO_BUF_REG_FALLBACK' undeclared (first
use in this function); did you mean 'UBLKSRV_AUTO_BUF_REG_FALLBACK'?
  587 |                 buf.flags = UBLK_AUTO_BUF_REG_FALLBACK;
      |                             ^~~~~~~~~~~~~~~~~~~~~~~~~~
      |                             UBLKSRV_AUTO_BUF_REG_FALLBACK
kublk.c:589:21: error: implicit declaration of function
'ublk_auto_buf_reg_to_sqe_addr'
[-Werror=implicit-function-declaration]
  589 |         sqe->addr = ublk_auto_buf_reg_to_sqe_addr(&buf);
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kublk.c:579:34: error: unused variable 'buf' [-Werror=unused-variable]
  579 |         struct ublk_auto_buf_reg buf = {};
      |                                  ^~~
kublk.c: In function '__cmd_dev_add':
kublk.c:1178:25: error: 'UBLK_F_QUIESCE' undeclared (first use in this function)
 1178 |         if ((features & UBLK_F_QUIESCE) &&
      |                         ^~~~~~~~~~~~~~
kublk.c: In function 'cmd_dev_get_features':
kublk.c:1381:30: error: 'UBLK_F_UPDATE_SIZE' undeclared (first use in
this function)
 1381 |                 [const_ilog2(UBLK_F_UPDATE_SIZE)] = "UPDATE_SIZE",
      |                              ^~~~~~~~~~~~~~~~~~
kublk.c:1369:46: note: in definition of macro 'const_ilog2'
 1369 | #define const_ilog2(x) (63 - __builtin_clzll(x))
      |                                              ^
kublk.c:1369:24: error: array index in initializer not of integer type
 1369 | #define const_ilog2(x) (63 - __builtin_clzll(x))
      |                        ^
kublk.c:1381:18: note: in expansion of macro 'const_ilog2'
 1381 |                 [const_ilog2(UBLK_F_UPDATE_SIZE)] = "UPDATE_SIZE",
      |                  ^~~~~~~~~~~
kublk.c:1369:24: note: (near initialization for 'feat_map')
 1369 | #define const_ilog2(x) (63 - __builtin_clzll(x))
      |                        ^
kublk.c:1381:18: note: in expansion of macro 'const_ilog2'
 1381 |                 [const_ilog2(UBLK_F_UPDATE_SIZE)] = "UPDATE_SIZE",
      |                  ^~~~~~~~~~~
kublk.c:1382:30: error: 'UBLK_F_AUTO_BUF_REG' undeclared (first use in
this function); did you mean 'UBLKSRV_AUTO_BUF_REG'?
 1382 |                 [const_ilog2(UBLK_F_AUTO_BUF_REG)] = "AUTO_BUF_REG",
      |                              ^~~~~~~~~~~~~~~~~~~
kublk.c:1369:46: note: in definition of macro 'const_ilog2'
 1369 | #define const_ilog2(x) (63 - __builtin_clzll(x))
      |                                              ^
kublk.c:1369:24: error: array index in initializer not of integer type
 1369 | #define const_ilog2(x) (63 - __builtin_clzll(x))
      |                        ^
kublk.c:1382:18: note: in expansion of macro 'const_ilog2'
 1382 |                 [const_ilog2(UBLK_F_AUTO_BUF_REG)] = "AUTO_BUF_REG",
      |                  ^~~~~~~~~~~
kublk.c:1369:24: note: (near initialization for 'feat_map')
 1369 | #define const_ilog2(x) (63 - __builtin_clzll(x))
      |                        ^
kublk.c:1382:18: note: in expansion of macro 'const_ilog2'
 1382 |                 [const_ilog2(UBLK_F_AUTO_BUF_REG)] = "AUTO_BUF_REG",
      |                  ^~~~~~~~~~~
kublk.c:1383:30: error: 'UBLK_F_QUIESCE' undeclared (first use in this function)
 1383 |                 [const_ilog2(UBLK_F_QUIESCE)] = "QUIESCE",
      |                              ^~~~~~~~~~~~~~
kublk.c:1369:46: note: in definition of macro 'const_ilog2'
 1369 | #define const_ilog2(x) (63 - __builtin_clzll(x))
      |                                              ^
kublk.c:1369:24: error: array index in initializer not of integer type
 1369 | #define const_ilog2(x) (63 - __builtin_clzll(x))
      |                        ^
kublk.c:1383:18: note: in expansion of macro 'const_ilog2'
 1383 |                 [const_ilog2(UBLK_F_QUIESCE)] = "QUIESCE",
      |                  ^~~~~~~~~~~
kublk.c:1369:24: note: (near initialization for 'feat_map')
 1369 | #define const_ilog2(x) (63 - __builtin_clzll(x))
      |                        ^
kublk.c:1383:18: note: in expansion of macro 'const_ilog2'
 1383 |                 [const_ilog2(UBLK_F_QUIESCE)] = "QUIESCE",
      |                  ^~~~~~~~~~~
kublk.c:1384:30: error: 'UBLK_F_PER_IO_DAEMON' undeclared (first use
in this function)
 1384 |                 [const_ilog2(UBLK_F_PER_IO_DAEMON)] = "PER_IO_DAEMON",
      |                              ^~~~~~~~~~~~~~~~~~~~
kublk.c:1369:46: note: in definition of macro 'const_ilog2'
 1369 | #define const_ilog2(x) (63 - __builtin_clzll(x))
      |                                              ^
kublk.c:1369:24: error: array index in initializer not of integer type
 1369 | #define const_ilog2(x) (63 - __builtin_clzll(x))
      |                        ^
kublk.c:1384:18: note: in expansion of macro 'const_ilog2'
 1384 |                 [const_ilog2(UBLK_F_PER_IO_DAEMON)] = "PER_IO_DAEMON",
      |                  ^~~~~~~~~~~
kublk.c:1369:24: note: (near initialization for 'feat_map')
 1369 | #define const_ilog2(x) (63 - __builtin_clzll(x))
      |                        ^
kublk.c:1384:18: note: in expansion of macro 'const_ilog2'
 1384 |                 [const_ilog2(UBLK_F_PER_IO_DAEMON)] = "PER_IO_DAEMON",
      |                  ^~~~~~~~~~~
kublk.c: In function 'main':
kublk.c:1613:46: error: 'UBLK_F_AUTO_BUF_REG' undeclared (first use in
this function); did you mean 'UBLKSRV_AUTO_BUF_REG'?
 1613 |                                 ctx.flags |= UBLK_F_AUTO_BUF_REG;
      |                                              ^~~~~~~~~~~~~~~~~~~
      |                                              UBLKSRV_AUTO_BUF_REG
cc1: all warnings being treated as errors
## Source
* Kernel version: 6.16.0-rc2
* Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
* Git sha: 050f8ad7b58d9079455af171ac279c4b9b828c11
* Git describe: next-20250616
* Project details:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250616/
* Architectures: arm, arm64, x86_64
* Toolchains: gcc-13, clang nightly
* Kconfigs: selftest/*/config+defconfig+
## Build arm64
* Build log clang:
https://regressions.linaro.org/lkft/linux-next-master/next-20250617/log-pars...
* Build log gcc:
https://regressions.linaro.org/lkft/linux-next-master/next-20250617/log-pars...
* Build details:
https://regressions.linaro.org/lkft/linux-next-master/next-20250617/log-pars...
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2ycmBy2r4aPm6emlo7FXw...
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2ycmBy2r4aPm6emlo7FXw...
## Steps to reproduce
 - tuxmake  \
    --runtime podman  \
    --target-arch arm64  \
    --toolchain gcc-13  \
    --kconfig defconfig  \
    --kconfig-add
https://gitlab.com/Linaro/lkft/kernel-fragments/-/raw/main/netdev.config
 \
    --kconfig-add
https://gitlab.com/Linaro/lkft/kernel-fragments/-/raw/main/systemd.config
 \
    --kconfig-add CONFIG_SYN_COOKIES=y  \
    --kconfig-add CONFIG_SCHEDSTATS=y debugkernel dtbs dtbs-legacy
headers kernel kselftest modules
--
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https://lkft.linaro.org

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selftests ublk UBLK_IO_F_NEED_REG_BUF undeclared