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Subjectarch/arm64/kernel/fpsimd.c:1944:55: sparse: sparse: dereference of noderef expression
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 8291eaafed36f575f23951f3ce18407f480e9ecf
commit: e0838f6373e5cb72516fc4c26bba309097e2a80a arm64/sme: Save and restore streaming mode over EFI runtime calls
date: 5 weeks ago
config: arm64-randconfig-s032-20220527 (https://download.01.org/0day-ci/archive/20220528/202205280635.XKlMkfKD-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 11.3.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-14-g5a0004b5-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e0838f6373e5cb72516fc4c26bba309097e2a80a
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout e0838f6373e5cb72516fc4c26bba309097e2a80a
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/kernel/

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


sparse warnings: (new ones prefixed by >>)
>> arch/arm64/kernel/fpsimd.c:1944:55: sparse: sparse: dereference of noderef expression

vim +1944 arch/arm64/kernel/fpsimd.c

1916
1917 /*
1918 * __efi_fpsimd_end(): clean up FPSIMD after an EFI runtime services call
1919 */
1920 void __efi_fpsimd_end(void)
1921 {
1922 if (!system_supports_fpsimd())
1923 return;
1924
1925 if (!__this_cpu_xchg(efi_fpsimd_state_used, false)) {
1926 kernel_neon_end();
1927 } else {
1928 if (system_supports_sve() &&
1929 likely(__this_cpu_read(efi_sve_state_used))) {
1930 char const *sve_state = this_cpu_ptr(efi_sve_state);
1931 bool ffr = true;
1932
1933 /*
1934 * Restore streaming mode; EFI calls are
1935 * normal function calls so should not return in
1936 * streaming mode.
1937 */
1938 if (system_supports_sme()) {
1939 if (__this_cpu_read(efi_sm_state)) {
1940 sysreg_clear_set_s(SYS_SVCR_EL0,
1941 0,
1942 SYS_SVCR_EL0_SM_MASK);
1943 if (!system_supports_fa64())
> 1944 ffr = efi_sm_state;
1945 }
1946 }
1947
1948 sve_load_state(sve_state + sve_ffr_offset(sve_max_vl()),
1949 &this_cpu_ptr(&efi_fpsimd_state)->fpsr,
1950 ffr);
1951
1952 __this_cpu_write(efi_sve_state_used, false);
1953 } else {
1954 fpsimd_load_state(this_cpu_ptr(&efi_fpsimd_state));
1955 }
1956 }
1957 }
1958

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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