arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_epoll_pwait2'

From: kernel test robot
Date: Tue Mar 16 2021 - 15:04:56 EST


tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 1df27313f50a57497c1faeb6a6ae4ca939c85a7d
commit: b0a0c2615f6f199a656ed8549d7dce625d77aa77 epoll: wire up syscall epoll_pwait2
date: 3 months ago
config: x86_64-randconfig-r015-20210316 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b0a0c2615f6f199a656ed8549d7dce625d77aa77
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout b0a0c2615f6f199a656ed8549d7dce625d77aa77
# save the attached .config to linux build tree
make W=1 ARCH=x86_64

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

All warnings (new ones prefixed by >>):

| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:48:1: note: in expansion of macro 'COND_SYSCALL'
48 | COND_SYSCALL(io_pgetevents);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_io_uring_setup' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:51:1: note: in expansion of macro 'COND_SYSCALL'
51 | COND_SYSCALL(io_uring_setup);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_io_uring_enter' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:52:1: note: in expansion of macro 'COND_SYSCALL'
52 | COND_SYSCALL(io_uring_enter);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_io_uring_register' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:53:1: note: in expansion of macro 'COND_SYSCALL'
53 | COND_SYSCALL(io_uring_register);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_lookup_dcookie' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:60:1: note: in expansion of macro 'COND_SYSCALL'
60 | COND_SYSCALL(lookup_dcookie);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_eventfd2' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:64:1: note: in expansion of macro 'COND_SYSCALL'
64 | COND_SYSCALL(eventfd2);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_epoll_create1' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:67:1: note: in expansion of macro 'COND_SYSCALL'
67 | COND_SYSCALL(epoll_create1);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_epoll_ctl' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:68:1: note: in expansion of macro 'COND_SYSCALL'
68 | COND_SYSCALL(epoll_ctl);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_epoll_pwait' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:69:1: note: in expansion of macro 'COND_SYSCALL'
69 | COND_SYSCALL(epoll_pwait);
| ^~~~~~~~~~~~
>> arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_epoll_pwait2' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:71:1: note: in expansion of macro 'COND_SYSCALL'
71 | COND_SYSCALL(epoll_pwait2);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_inotify_init1' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:77:1: note: in expansion of macro 'COND_SYSCALL'
77 | COND_SYSCALL(inotify_init1);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_inotify_add_watch' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:78:1: note: in expansion of macro 'COND_SYSCALL'
78 | COND_SYSCALL(inotify_add_watch);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_inotify_rm_watch' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:79:1: note: in expansion of macro 'COND_SYSCALL'
79 | COND_SYSCALL(inotify_rm_watch);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_ioprio_set' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:84:1: note: in expansion of macro 'COND_SYSCALL'
84 | COND_SYSCALL(ioprio_set);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_ioprio_get' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:85:1: note: in expansion of macro 'COND_SYSCALL'
85 | COND_SYSCALL(ioprio_get);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_flock' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:88:1: note: in expansion of macro 'COND_SYSCALL'
88 | COND_SYSCALL(flock);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_quotactl' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)
| ^~~~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:256:2: note: in expansion of macro '__X64_COND_SYSCALL'
256 | __X64_COND_SYSCALL(name) \
| ^~~~~~~~~~~~~~~~~~
kernel/sys_ni.c:101:1: note: in expansion of macro 'COND_SYSCALL'
101 | COND_SYSCALL(quotactl);
| ^~~~~~~~~~~~
arch/x86/include/asm/syscall_wrapper.h:83:14: warning: no previous prototype for '__x64_sys_signalfd4' [-Wmissing-prototypes]
83 | __weak long __##abi##_##name(const struct pt_regs *__unused) \
| ^~
arch/x86/include/asm/syscall_wrapper.h:100:2: note: in expansion of macro '__COND_SYSCALL'
100 | __COND_SYSCALL(x64, sys_##name)


vim +/__x64_sys_epoll_pwait2 +83 arch/x86/include/asm/syscall_wrapper.h

cc42c045af1ff4 Brian Gerst 2020-03-13 13
25c619e59b395a Brian Gerst 2020-03-13 14 /*
25c619e59b395a Brian Gerst 2020-03-13 15 * Instead of the generic __SYSCALL_DEFINEx() definition, the x86 version takes
25c619e59b395a Brian Gerst 2020-03-13 16 * struct pt_regs *regs as the only argument of the syscall stub(s) named as:
25c619e59b395a Brian Gerst 2020-03-13 17 * __x64_sys_*() - 64-bit native syscall
25c619e59b395a Brian Gerst 2020-03-13 18 * __ia32_sys_*() - 32-bit native syscall or common compat syscall
25c619e59b395a Brian Gerst 2020-03-13 19 * __ia32_compat_sys_*() - 32-bit compat syscall
25c619e59b395a Brian Gerst 2020-03-13 20 * __x32_compat_sys_*() - 64-bit X32 compat syscall
25c619e59b395a Brian Gerst 2020-03-13 21 *
25c619e59b395a Brian Gerst 2020-03-13 22 * The registers are decoded according to the ABI:
25c619e59b395a Brian Gerst 2020-03-13 23 * 64-bit: RDI, RSI, RDX, R10, R8, R9
25c619e59b395a Brian Gerst 2020-03-13 24 * 32-bit: EBX, ECX, EDX, ESI, EDI, EBP
25c619e59b395a Brian Gerst 2020-03-13 25 *
25c619e59b395a Brian Gerst 2020-03-13 26 * The stub then passes the decoded arguments to the __se_sys_*() wrapper to
25c619e59b395a Brian Gerst 2020-03-13 27 * perform sign-extension (omitted for zero-argument syscalls). Finally the
25c619e59b395a Brian Gerst 2020-03-13 28 * arguments are passed to the __do_sys_*() function which is the actual
25c619e59b395a Brian Gerst 2020-03-13 29 * syscall. These wrappers are marked as inline so the compiler can optimize
25c619e59b395a Brian Gerst 2020-03-13 30 * the functions where appropriate.
25c619e59b395a Brian Gerst 2020-03-13 31 *
25c619e59b395a Brian Gerst 2020-03-13 32 * Example assembly (slightly re-ordered for better readability):
25c619e59b395a Brian Gerst 2020-03-13 33 *
25c619e59b395a Brian Gerst 2020-03-13 34 * <__x64_sys_recv>: <-- syscall with 4 parameters
25c619e59b395a Brian Gerst 2020-03-13 35 * callq <__fentry__>
25c619e59b395a Brian Gerst 2020-03-13 36 *
25c619e59b395a Brian Gerst 2020-03-13 37 * mov 0x70(%rdi),%rdi <-- decode regs->di
25c619e59b395a Brian Gerst 2020-03-13 38 * mov 0x68(%rdi),%rsi <-- decode regs->si
25c619e59b395a Brian Gerst 2020-03-13 39 * mov 0x60(%rdi),%rdx <-- decode regs->dx
25c619e59b395a Brian Gerst 2020-03-13 40 * mov 0x38(%rdi),%rcx <-- decode regs->r10
25c619e59b395a Brian Gerst 2020-03-13 41 *
25c619e59b395a Brian Gerst 2020-03-13 42 * xor %r9d,%r9d <-- clear %r9
25c619e59b395a Brian Gerst 2020-03-13 43 * xor %r8d,%r8d <-- clear %r8
25c619e59b395a Brian Gerst 2020-03-13 44 *
25c619e59b395a Brian Gerst 2020-03-13 45 * callq __sys_recvfrom <-- do the actual work in __sys_recvfrom()
25c619e59b395a Brian Gerst 2020-03-13 46 * which takes 6 arguments
25c619e59b395a Brian Gerst 2020-03-13 47 *
25c619e59b395a Brian Gerst 2020-03-13 48 * cltq <-- extend return value to 64-bit
25c619e59b395a Brian Gerst 2020-03-13 49 * retq <-- return
25c619e59b395a Brian Gerst 2020-03-13 50 *
25c619e59b395a Brian Gerst 2020-03-13 51 * This approach avoids leaking random user-provided register content down
25c619e59b395a Brian Gerst 2020-03-13 52 * the call chain.
25c619e59b395a Brian Gerst 2020-03-13 53 */
25c619e59b395a Brian Gerst 2020-03-13 54
ebeb8c82ffaf94 Dominik Brodowski 2018-04-05 55 /* Mapping of registers to parameters for syscalls on x86-64 and x32 */
ebeb8c82ffaf94 Dominik Brodowski 2018-04-05 56 #define SC_X86_64_REGS_TO_ARGS(x, ...) \
ebeb8c82ffaf94 Dominik Brodowski 2018-04-05 57 __MAP(x,__SC_ARGS \
ebeb8c82ffaf94 Dominik Brodowski 2018-04-05 58 ,,regs->di,,regs->si,,regs->dx \
ebeb8c82ffaf94 Dominik Brodowski 2018-04-05 59 ,,regs->r10,,regs->r8,,regs->r9) \
ebeb8c82ffaf94 Dominik Brodowski 2018-04-05 60
ebeb8c82ffaf94 Dominik Brodowski 2018-04-05 61 /* Mapping of registers to parameters for syscalls on i386 */
ebeb8c82ffaf94 Dominik Brodowski 2018-04-05 62 #define SC_IA32_REGS_TO_ARGS(x, ...) \
ebeb8c82ffaf94 Dominik Brodowski 2018-04-05 63 __MAP(x,__SC_ARGS \
ebeb8c82ffaf94 Dominik Brodowski 2018-04-05 64 ,,(unsigned int)regs->bx,,(unsigned int)regs->cx \
ebeb8c82ffaf94 Dominik Brodowski 2018-04-05 65 ,,(unsigned int)regs->dx,,(unsigned int)regs->si \
ebeb8c82ffaf94 Dominik Brodowski 2018-04-05 66 ,,(unsigned int)regs->di,,(unsigned int)regs->bp)
ebeb8c82ffaf94 Dominik Brodowski 2018-04-05 67
d2b5de495ee983 Brian Gerst 2020-03-13 68 #define __SYS_STUB0(abi, name) \
0f78ff17112d8b Brian Gerst 2020-03-13 69 long __##abi##_##name(const struct pt_regs *regs); \
d2b5de495ee983 Brian Gerst 2020-03-13 70 ALLOW_ERROR_INJECTION(__##abi##_##name, ERRNO); \
0f78ff17112d8b Brian Gerst 2020-03-13 71 long __##abi##_##name(const struct pt_regs *regs) \
d2b5de495ee983 Brian Gerst 2020-03-13 72 __alias(__do_##name);
d2b5de495ee983 Brian Gerst 2020-03-13 73
4399e0cf494f73 Brian Gerst 2020-03-13 74 #define __SYS_STUBx(abi, name, ...) \
0f78ff17112d8b Brian Gerst 2020-03-13 75 long __##abi##_##name(const struct pt_regs *regs); \
4399e0cf494f73 Brian Gerst 2020-03-13 76 ALLOW_ERROR_INJECTION(__##abi##_##name, ERRNO); \
0f78ff17112d8b Brian Gerst 2020-03-13 77 long __##abi##_##name(const struct pt_regs *regs) \
4399e0cf494f73 Brian Gerst 2020-03-13 78 { \
4399e0cf494f73 Brian Gerst 2020-03-13 79 return __se_##name(__VA_ARGS__); \
4399e0cf494f73 Brian Gerst 2020-03-13 80 }
4399e0cf494f73 Brian Gerst 2020-03-13 81
6cc8d2b286d9e7 Brian Gerst 2020-03-13 82 #define __COND_SYSCALL(abi, name) \
0f78ff17112d8b Brian Gerst 2020-03-13 @83 __weak long __##abi##_##name(const struct pt_regs *__unused) \
6cc8d2b286d9e7 Brian Gerst 2020-03-13 84 { \
6cc8d2b286d9e7 Brian Gerst 2020-03-13 85 return sys_ni_syscall(); \
6cc8d2b286d9e7 Brian Gerst 2020-03-13 86 }
6cc8d2b286d9e7 Brian Gerst 2020-03-13 87

:::::: The code at line 83 was first introduced by commit
:::::: 0f78ff17112d8b3469b805ff4ea9780cc1e5c93b x86/entry: Drop asmlinkage from syscalls

:::::: TO: Brian Gerst <brgerst@xxxxxxxxx>
:::::: CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

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

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