Re: [PATCH v2] posix-timers: add multi_clock_gettime system call

From: kernel test robot
Date: Tue Nov 28 2023 - 06:45:26 EST

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In reply to: Sagi Maimon: "Re: [PATCH v2] posix-timers: add multi_clock_gettime system call"
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Hi Sagi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on arnd-asm-generic/master]
[also build test WARNING on tip/timers/core linus/master v6.7-rc3]
[cannot apply to tip/x86/asm next-20231128]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Sagi-Maimon/posix-timers-add-multi_clock_gettime-system-call/20231128-000215
base: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git master
patch link: https://lore.kernel.org/r/20231127153901.6399-1-maimon.sagi%40gmail.com
patch subject: [PATCH v2] posix-timers: add multi_clock_gettime system call
config: um-allmodconfig (https://download.01.org/0day-ci/archive/20231128/202311281817.puU0ujYG-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231128/202311281817.puU0ujYG-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311281817.puU0ujYG-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

In file included from kernel/time/posix-timers.c:13:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
547 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
560 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
| ^
In file included from kernel/time/posix-timers.c:13:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
573 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
In file included from kernel/time/posix-timers.c:13:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
584 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
594 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
604 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
692 | readsb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
700 | readsw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
708 | readsl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
717 | writesb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
726 | writesw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
735 | writesl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
>> kernel/time/posix-timers.c:1429:1: warning: stack frame size (2040) exceeds limit (1024) in '__se_sys_multi_clock_gettime' [-Wframe-larger-than]
1429 | SYSCALL_DEFINE1(multi_clock_gettime, struct __ptp_multi_clock_get __user *, ptp_multi_clk_get)
| ^
include/linux/syscalls.h:219:36: note: expanded from macro 'SYSCALL_DEFINE1'
219 | #define SYSCALL_DEFINE1(name, ...) SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
| ^
include/linux/syscalls.h:230:2: note: expanded from macro 'SYSCALL_DEFINEx'
230 | __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
| ^
include/linux/syscalls.h:249:18: note: expanded from macro '__SYSCALL_DEFINEx'
249 | asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
| ^
<scratch space>:122:1: note: expanded from here
122 | __se_sys_multi_clock_gettime
| ^
>> kernel/time/posix-timers.c:1460:1: warning: stack frame size (2040) exceeds limit (1024) in '__se_sys_multi_clock_gettime32' [-Wframe-larger-than]
1460 | SYSCALL_DEFINE1(multi_clock_gettime32, struct __ptp_multi_clock_get32 __user *, ptp_multi_clk_get)
| ^
include/linux/syscalls.h:219:36: note: expanded from macro 'SYSCALL_DEFINE1'
219 | #define SYSCALL_DEFINE1(name, ...) SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
| ^
include/linux/syscalls.h:230:2: note: expanded from macro 'SYSCALL_DEFINEx'
230 | __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
| ^
include/linux/syscalls.h:249:18: note: expanded from macro '__SYSCALL_DEFINEx'
249 | asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
| ^
<scratch space>:147:1: note: expanded from here
147 | __se_sys_multi_clock_gettime32
| ^
14 warnings generated.

vim +/__se_sys_multi_clock_gettime +1429 kernel/time/posix-timers.c

1428
> 1429 SYSCALL_DEFINE1(multi_clock_gettime, struct __ptp_multi_clock_get __user *, ptp_multi_clk_get)
1430 {
1431 const struct k_clock *kc;
1432 struct timespec64 kernel_tp;
1433 struct __ptp_multi_clock_get multi_clk_get;
1434 int error;
1435 unsigned int i, j;
1436
1437 if (copy_from_user(&multi_clk_get, ptp_multi_clk_get, sizeof(multi_clk_get)))
1438 return -EFAULT;
1439
1440 if (multi_clk_get.n_samples > MULTI_PTP_MAX_SAMPLES)
1441 return -EINVAL;
1442 if (multi_clk_get.n_clocks > MULTI_PTP_MAX_CLOCKS)
1443 return -EINVAL;
1444
1445 for (j = 0; j < multi_clk_get.n_samples; j++) {
1446 for (i = 0; i < multi_clk_get.n_clocks; i++) {
1447 kc = clockid_to_kclock(multi_clk_get.clkid_arr[i]);
1448 if (!kc)
1449 return -EINVAL;
1450 error = kc->clock_get_timespec(multi_clk_get.clkid_arr[i], &kernel_tp);
1451 if (!error && put_timespec64(&kernel_tp, (struct __kernel_timespec __user *)
1452 &ptp_multi_clk_get->ts[j][i]))
1453 error = -EFAULT;
1454 }
1455 }
1456
1457 return error;
1458 }
1459
> 1460 SYSCALL_DEFINE1(multi_clock_gettime32, struct __ptp_multi_clock_get32 __user *, ptp_multi_clk_get)
1461 {
1462 const struct k_clock *kc;
1463 struct timespec64 kernel_tp;
1464 struct __ptp_multi_clock_get multi_clk_get;
1465 int error;
1466 unsigned int i, j;
1467
1468 if (copy_from_user(&multi_clk_get, ptp_multi_clk_get, sizeof(multi_clk_get)))
1469 return -EFAULT;
1470
1471 if (multi_clk_get.n_samples > MULTI_PTP_MAX_SAMPLES)
1472 return -EINVAL;
1473 if (multi_clk_get.n_clocks > MULTI_PTP_MAX_CLOCKS)
1474 return -EINVAL;
1475
1476 for (j = 0; j < multi_clk_get.n_samples; j++) {
1477 for (i = 0; i < multi_clk_get.n_clocks; i++) {
1478 kc = clockid_to_kclock(multi_clk_get.clkid_arr[i]);
1479 if (!kc)
1480 return -EINVAL;
1481 error = kc->clock_get_timespec(multi_clk_get.clkid_arr[i], &kernel_tp);
1482 if (!error && put_old_timespec32(&kernel_tp, (struct old_timespec32 __user *)
1483 &ptp_multi_clk_get->ts[j][i]))
1484 error = -EFAULT;
1485 }
1486 }
1487
1488 return error;
1489 }
1490

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Next message: Kuan-Ying Lee (李冠穎): "Re: [PATCH 1/3] scripts/gdb/tasks: Fix lx-ps command error"
Previous message: Johan Jonker: "Re: [PATCH v4 38/45] drm/rockchip: inno_hdmi: Switch to infoframe type"
In reply to: Sagi Maimon: "Re: [PATCH v2] posix-timers: add multi_clock_gettime system call"
Next in thread: kernel test robot: "Re: [PATCH v2] posix-timers: add multi_clock_gettime system call"
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