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SubjectRe: [PATCH v3 2/4] Refactor FPU codes in signal setup/return procedures
Hi Alan,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.18-rc7 next-20180802]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Alan-Kao/Extract-FPU-context-operations-from-entry-S/20180803-064749
config: riscv-defconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 8.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=8.1.0 make.cross ARCH=riscv

All errors (new ones prefixed by >>):

In file included from include/asm-generic/bug.h:18,
from arch/riscv/include/asm/bug.h:75,
from include/linux/bug.h:5,
from include/linux/signal.h:5,
from arch/riscv/kernel/signal.c:22:
arch/riscv/kernel/signal.c: In function 'save_fp_state':
>> arch/riscv/kernel/signal.c:80:38: error: 'sc_fpregs' is a pointer; did you mean to use '->'?
for (i = 0; i < ARRAY_SIZE(sc_fpregs.q.reserved); i++) {
^
include/linux/kernel.h:72:33: note: in definition of macro 'ARRAY_SIZE'
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
^~~
>> arch/riscv/kernel/signal.c:80:38: error: 'sc_fpregs' is a pointer; did you mean to use '->'?
for (i = 0; i < ARRAY_SIZE(sc_fpregs.q.reserved); i++) {
^
include/linux/kernel.h:72:48: note: in definition of macro 'ARRAY_SIZE'
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
^~~
In file included from include/linux/kernel.h:15,
from include/asm-generic/bug.h:18,
from arch/riscv/include/asm/bug.h:75,
from include/linux/bug.h:5,
from include/linux/signal.h:5,
from arch/riscv/kernel/signal.c:22:
>> arch/riscv/kernel/signal.c:80:38: error: 'sc_fpregs' is a pointer; did you mean to use '->'?
for (i = 0; i < ARRAY_SIZE(sc_fpregs.q.reserved); i++) {
^
include/linux/build_bug.h:29:56: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:(-!!(e)); }))
^
include/linux/compiler-gcc.h:65:46: note: in expansion of macro '__same_type'
#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
^~~~~~~~~~~
include/linux/kernel.h:72:59: note: in expansion of macro '__must_be_array'
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
^~~~~~~~~~~~~~~
arch/riscv/kernel/signal.c:80:18: note: in expansion of macro 'ARRAY_SIZE'
for (i = 0; i < ARRAY_SIZE(sc_fpregs.q.reserved); i++) {
^~~~~~~~~~
>> arch/riscv/kernel/signal.c:80:38: error: 'sc_fpregs' is a pointer; did you mean to use '->'?
for (i = 0; i < ARRAY_SIZE(sc_fpregs.q.reserved); i++) {
^
include/linux/build_bug.h:29:56: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:(-!!(e)); }))
^
include/linux/compiler-gcc.h:65:46: note: in expansion of macro '__same_type'
#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
^~~~~~~~~~~
include/linux/kernel.h:72:59: note: in expansion of macro '__must_be_array'
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
^~~~~~~~~~~~~~~
arch/riscv/kernel/signal.c:80:18: note: in expansion of macro 'ARRAY_SIZE'
for (i = 0; i < ARRAY_SIZE(sc_fpregs.q.reserved); i++) {
^~~~~~~~~~
include/linux/build_bug.h:29:45: error: bit-field '<anonymous>' width not an integer constant
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:(-!!(e)); }))
^
include/linux/compiler-gcc.h:65:28: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
^~~~~~~~~~~~~~~~~
include/linux/kernel.h:72:59: note: in expansion of macro '__must_be_array'
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
^~~~~~~~~~~~~~~
arch/riscv/kernel/signal.c:80:18: note: in expansion of macro 'ARRAY_SIZE'
for (i = 0; i < ARRAY_SIZE(sc_fpregs.q.reserved); i++) {
^~~~~~~~~~
In file included from include/linux/uaccess.h:14,
from arch/riscv/kernel/signal.c:23:
arch/riscv/kernel/signal.c:81:33: error: 'sc_fpregs' is a pointer; did you mean to use '->'?
err = __put_user(0, &sc_fpregs.q.reserved[i]);
^
arch/riscv/include/asm/uaccess.h:348:15: note: in definition of macro '__put_user'
__typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
^~~
arch/riscv/kernel/signal.c:81:33: error: 'sc_fpregs' is a pointer; did you mean to use '->'?
err = __put_user(0, &sc_fpregs.q.reserved[i]);
^
arch/riscv/include/asm/uaccess.h:348:41: note: in definition of macro '__put_user'
__typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
^~~

vim +80 arch/riscv/kernel/signal.c

> 22 #include <linux/signal.h>
23 #include <linux/uaccess.h>
24 #include <linux/syscalls.h>
25 #include <linux/tracehook.h>
26 #include <linux/linkage.h>
27
28 #include <asm/ucontext.h>
29 #include <asm/vdso.h>
30 #include <asm/switch_to.h>
31 #include <asm/csr.h>
32
33 #define DEBUG_SIG 0
34
35 struct rt_sigframe {
36 struct siginfo info;
37 struct ucontext uc;
38 };
39
40 static long restore_fp_state(struct pt_regs *regs,
41 union __riscv_fp_state *sc_fpregs)
42 {
43 long err;
44 struct __riscv_d_ext_state __user *state = &sc_fpregs->d;
45 size_t i;
46
47 err = __copy_from_user(&current->thread.fstate, state, sizeof(*state));
48 if (unlikely(err))
49 return err;
50
51 fstate_restore(current, regs);
52
53 /* We support no other extension state at this time. */
54 for (i = 0; i < ARRAY_SIZE(sc_fpregs->q.reserved); i++) {
55 u32 value;
56
57 err = __get_user(value, &sc_fpregs->q.reserved[i]);
58 if (unlikely(err))
59 break;
60 if (value != 0)
61 return -EINVAL;
62 }
63
64 return err;
65 }
66
67 static long save_fp_state(struct pt_regs *regs,
68 union __riscv_fp_state *sc_fpregs)
69 {
70 long err;
71 struct __riscv_d_ext_state __user *state = &sc_fpregs->d;
72 size_t i;
73
74 fstate_save(current, regs);
75 err = __copy_to_user(state, &current->thread.fstate, sizeof(*state));
76 if (unlikely(err))
77 return err;
78
79 /* We support no other extension state at this time. */
> 80 for (i = 0; i < ARRAY_SIZE(sc_fpregs.q.reserved); i++) {
81 err = __put_user(0, &sc_fpregs.q.reserved[i]);
82 if (unlikely(err))
83 break;
84 }
85
86 return err;
87 }
88

---
0-DAY kernel test infrastructure Open Source Technology Center
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