4:06 p.m.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 06a4ec1d9dc652e17ee3ac2ceb6c7cf6c2b75cdd
commit: c9b0299034665d594e56ee343f28033d1b24de6d MIPS: Use fallthrough for arch/mips
date: 3 months ago
config: mips-randconfig-m031-20200818 (attached as .config)
compiler: mips-linux-gcc (GCC) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com>
New smatch warnings:
arch/mips/include/asm/fpu.h:79 __enable_fpu() warn: ignoring unreachable code.
arch/mips/include/asm/fpu.h:79 __enable_fpu() warn: ignoring unreachable code.
Old smatch warnings:
arch/mips/kernel/traps.c:1914 nmi_exception_handler() warn: ignoring unreachable code.
#
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit...
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout c9b0299034665d594e56ee343f28033d1b24de6d
vim +79 arch/mips/include/asm/fpu.h
53
54 static inline int __enable_fpu(enum fpu_mode mode)
55 {
56 int fr;
57
58 switch (mode) {
59 case FPU_AS_IS:
60 /* just enable the FPU in its current mode */
61 set_c0_status(ST0_CU1);
62 enable_fpu_hazard();
63 return 0;
64
65 case FPU_HYBRID:
66 if (!cpu_has_fre)
67 return SIGFPE;
68
69 /* set FRE */
70 set_c0_config5(MIPS_CONF5_FRE);
71 goto fr_common;
72
73 case FPU_64BIT:
74 #if !(defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) \
75 || defined(CONFIG_64BIT))
76 /* we only have a 32-bit FPU */
77 return SIGFPE;
78 #endif
79 fallthrough;
80 case FPU_32BIT:
81 if (cpu_has_fre) {
82 /* clear FRE */
83 clear_c0_config5(MIPS_CONF5_FRE);
84 }
85 fr_common:
86 /* set CU1 & change FR appropriately */
87 fr = (int)mode & FPU_FR_MASK;
88 change_c0_status(ST0_CU1 | ST0_FR, ST0_CU1 | (fr ? ST0_FR : 0));
89 enable_fpu_hazard();
90
91 /* check FR has the desired value */
92 if (!!(read_c0_status() & ST0_FR) == !!fr)
93 return 0;
94
95 /* unsupported FR value */
96 __disable_fpu();
97 return SIGFPE;
98
99 default:
100 BUG();
101 }
102
103 return SIGFPE;
104 }
105
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