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Message-ID: <202512141354.zefMnJb2-lkp@intel.com>
Date: Sun, 14 Dec 2025 13:13:55 +0800
From: kernel test robot <lkp@...el.com>
To: Paul Mackerras <paulus@...abs.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
Madhavan Srinivasan <maddy@...ux.ibm.com>
Subject: arch/powerpc/platforms/microwatt/smp.c:79:24: sparse: sparse: cast
removes address space '__iomem' of expression
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 0dfb36b2dcb666f116ba314e631bd3bc632c44d1
commit: aca95fb6bb572a77f39d42d83ab72a965026577d powerpc/microwatt: Add SMP support
date: 10 months ago
config: powerpc64-randconfig-r134-20251214 (https://download.01.org/0day-ci/archive/20251214/202512141354.zefMnJb2-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251214/202512141354.zefMnJb2-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512141354.zefMnJb2-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from arch/powerpc/math-emu/fctiw.c:8:
include/math-emu/double.h:59:21: warning: '__BIG_ENDIAN' is not defined, evaluates to 0 [-Wundef]
59 | #if __BYTE_ORDER == __BIG_ENDIAN
| ^
>> arch/powerpc/math-emu/fctiw.c:14:2: warning: variable '_fex' set but not used [-Wunused-but-set-variable]
14 | FP_DECL_EX;
| ^
include/math-emu/soft-fp.h:94:24: note: expanded from macro 'FP_DECL_EX'
94 | #define FP_DECL_EX int _fex = 0
| ^
2 warnings generated.
--
In file included from arch/powerpc/math-emu/fsel.c:8:
include/math-emu/double.h:59:21: warning: '__BIG_ENDIAN' is not defined, evaluates to 0 [-Wundef]
59 | #if __BYTE_ORDER == __BIG_ENDIAN
| ^
>> arch/powerpc/math-emu/fsel.c:14:2: warning: variable '_fex' set but not used [-Wunused-but-set-variable]
14 | FP_DECL_EX;
| ^
include/math-emu/soft-fp.h:94:24: note: expanded from macro 'FP_DECL_EX'
94 | #define FP_DECL_EX int _fex = 0
| ^
2 warnings generated.
Kconfig warnings: (for reference only)
WARNING: unmet direct dependencies detected for PPC_RADIX_BROADCAST_TLBIE
Depends on [n]: PPC_RADIX_MMU [=n]
Selected by [y]:
- PPC_POWERNV [=y] && PPC64 [=y] && PPC_BOOK3S [=y]
- PPC_PSERIES [=y] && PPC64 [=y] && PPC_BOOK3S [=y]
sparse warnings: (new ones prefixed by >>)
arch/powerpc/math-emu/lfs.c: note: in included file:
include/math-emu/double.h:59:21: sparse: sparse: undefined preprocessor identifier '__BIG_ENDIAN'
arch/powerpc/math-emu/lfs.c: note: in included file:
include/math-emu/single.h:50:21: sparse: sparse: undefined preprocessor identifier '__BIG_ENDIAN'
>> arch/powerpc/math-emu/lfs.c:23:32: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const [noderef] __user *from @@ got void *ea @@
arch/powerpc/math-emu/lfs.c:23:32: sparse: expected void const [noderef] __user *from
arch/powerpc/math-emu/lfs.c:23:32: sparse: got void *ea
--
arch/powerpc/math-emu/lfd.c: note: in included file:
include/math-emu/double.h:59:21: sparse: sparse: undefined preprocessor identifier '__BIG_ENDIAN'
>> arch/powerpc/math-emu/lfd.c:12:33: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const [noderef] __user *from @@ got void *ea @@
arch/powerpc/math-emu/lfd.c:12:33: sparse: expected void const [noderef] __user *from
arch/powerpc/math-emu/lfd.c:12:33: sparse: got void *ea
arch/powerpc/math-emu/lfd.c:10:1: sparse: sparse: symbol 'lfd' was not declared. Should it be static?
--
>> arch/powerpc/math-emu/stfiwx.c:13:26: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void [noderef] __user *to @@ got void *ea @@
arch/powerpc/math-emu/stfiwx.c:13:26: sparse: expected void [noderef] __user *to
arch/powerpc/math-emu/stfiwx.c:13:26: sparse: got void *ea
--
>> arch/powerpc/math-emu/stfd.c:17:26: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void [noderef] __user *to @@ got void *ea @@
arch/powerpc/math-emu/stfd.c:17:26: sparse: expected void [noderef] __user *to
arch/powerpc/math-emu/stfd.c:17:26: sparse: got void *ea
--
arch/powerpc/math-emu/stfs.c: note: in included file:
include/math-emu/double.h:59:21: sparse: sparse: undefined preprocessor identifier '__BIG_ENDIAN'
arch/powerpc/math-emu/stfs.c: note: in included file:
include/math-emu/single.h:50:21: sparse: sparse: undefined preprocessor identifier '__BIG_ENDIAN'
>> arch/powerpc/math-emu/stfs.c:38:34: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void [noderef] __user *to @@ got void *ea @@
arch/powerpc/math-emu/stfs.c:38:34: sparse: expected void [noderef] __user *to
arch/powerpc/math-emu/stfs.c:38:34: sparse: got void *ea
--
>> arch/powerpc/platforms/microwatt/smp.c:79:24: sparse: sparse: cast removes address space '__iomem' of expression
>> arch/powerpc/platforms/microwatt/smp.c:79:24: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void [noderef] __iomem *addr @@ got void * @@
arch/powerpc/platforms/microwatt/smp.c:79:24: sparse: expected void [noderef] __iomem *addr
arch/powerpc/platforms/microwatt/smp.c:79:24: sparse: got void *
vim +/__iomem +79 arch/powerpc/platforms/microwatt/smp.c
42
43 void __init microwatt_init_smp(void)
44 {
45 volatile unsigned char __iomem *syscon;
46 int ncpus;
47 int timeout;
48
49 syscon = early_ioremap(SYSCON_BASE, SYSCON_LENGTH);
50 if (syscon == NULL) {
51 pr_err("Failed to map SYSCON\n");
52 return;
53 }
54 ncpus = (readl(syscon + SYSCON_CPU_CTRL) >> 8) & 0xff;
55 if (ncpus < 2)
56 goto out;
57
58 smp_ops = µwatt_smp_ops;
59
60 /*
61 * Write two instructions at location 0:
62 * mfspr r3, PIR
63 * b __secondary_hold
64 */
65 *(unsigned int *)KERNELBASE = PPC_RAW_MFSPR(3, SPRN_PIR);
66 *(unsigned int *)(KERNELBASE+4) = PPC_RAW_BRANCH(&__secondary_hold - (char *)(KERNELBASE+4));
67
68 /* enable the other CPUs, they start at location 0 */
69 writel((1ul << ncpus) - 1, syscon + SYSCON_CPU_CTRL);
70
71 timeout = 10000;
72 while (!__secondary_hold_acknowledge) {
73 if (--timeout == 0)
74 break;
75 barrier();
76 }
77
78 out:
> 79 early_iounmap((void *)syscon, SYSCON_LENGTH);
--
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