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Subjectdrivers/mmc/host/sdhci-esdhc-imx.c:343:19: warning: unused function 'is_imx6q_usdhc'
Hi Krzysztof,

First bad commit (maybe != root cause):

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: ad9f25d338605d26acedcaf3ba5fab5ca26f1c10
commit: 54d8454436a205682bd89d66d8d9eedbc8452d15 mmc: host: Enable compile testing of multiple drivers
date: 9 months ago
config: mips-randconfig-r006-20210526 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 99155e913e9bad5f7f8a247f8bb3a3ff3da74af1)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54d8454436a205682bd89d66d8d9eedbc8452d15
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 54d8454436a205682bd89d66d8d9eedbc8452d15
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/mmc/host/sdhci-esdhc-imx.c:343:19: warning: unused function 'is_imx6q_usdhc'
static inline int is_imx6q_usdhc(struct pltfm_imx_data
^
fatal error: error in backend: Nested variants found in inline asm string: '.if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/barrier.h", .line = 16, $); 0x00 ) != -1)) : $))) ) && ( (1 << 0) ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif'
clang-13: error: clang frontend command failed with exit code 70 (use -v to see invocation)
clang version 13.0.0 (git://gitmirror/llvm_project 99155e913e9bad5f7f8a247f8bb3a3ff3da74af1)
Target: mipsel-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/cross/clang-99155e913e/bin
clang-13: note: diagnostic msg:
Makefile arch block drivers include kernel scripts source usr
--
>> drivers/mmc/host/sdhci-sprd.c:134:20: warning: unused function 'sdhci_sprd_writew'
static inline void sdhci_sprd_writew(struct sdhci_host u16 val, int reg)
^
fatal error: error in backend: Nested variants found in inline asm string: ' .set push
.set mips64r2
.if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/atomic.h", .line = 153, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
1: ll $0, $1 # atomic_add
addu $0, $2
sc $0, $1
beqz $0, 1b
.set pop
'
clang-13: error: clang frontend command failed with exit code 70 (use -v to see invocation)
clang version 13.0.0 (git://gitmirror/llvm_project 99155e913e9bad5f7f8a247f8bb3a3ff3da74af1)
Target: mipsel-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/cross/clang-99155e913e/bin
clang-13: note: diagnostic msg:
Makefile arch block drivers include kernel scripts source usr


vim +/is_imx6q_usdhc +343 drivers/mmc/host/sdhci-esdhc-imx.c

57ed3314e0bfa90 Shawn Guo 2011-06-30 342
95a2482a9baaf55 Shawn Guo 2011-09-19 @343 static inline int is_imx6q_usdhc(struct pltfm_imx_data *data)
95a2482a9baaf55 Shawn Guo 2011-09-19 344 {
f47c4bbfa283df2 Shawn Guo 2013-10-17 345 return data->socdata == &usdhc_imx6q_data;
95a2482a9baaf55 Shawn Guo 2011-09-19 346 }
95a2482a9baaf55 Shawn Guo 2011-09-19 347

:::::: The code at line 343 was first introduced by commit
:::::: 95a2482a9baaf55a3403d2e76f2abd7c0a32298c mmc: sdhci-esdhc-imx: add basic imx6q usdhc support

:::::: TO: Shawn Guo <shawn.guo@linaro.org>
:::::: CC: Chris Ball <cjb@laptop.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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