linux-kernel - Re: [2.6.27.2] Unnamed entry appears in /sys/module/usbcore/parameters/ .

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Date:	Wed, 22 Oct 2008 22:11:13 -0700
From:	Greg KH <greg@...ah.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [2.6.27.2] Unnamed entry appears in
	/sys/module/usbcore/parameters/ .

On Wed, Oct 22, 2008 at 07:51:13PM +0900, Tetsuo Handa wrote:
> Hello.
> 
> Below four results are obtained using config
> at http://I-love.SAKURA.ne.jp/tmp/config-2.6.27.2-2
> with CONFIG_USB=y and CONFIG_USB=m .
> 
> ----------------------------------------
> Result of CONFIG_USB=y on Debian Sarge
> 
> # ls -ail /sys/module/usbcore/parameters/
> total 0
> 200 drwxr-xr-x  2 root root    0 Oct 22 13:03
> 200 drwxr-xr-x  2 root root    0 Oct 22 13:03 .
> 199 drwxr-xr-x  4 root root    0 Oct 22 13:03 ..
> 201 -rw-r--r--  1 root root 4096 Oct 22 13:03 autosuspend
> 203 -r--r--r--  1 root root 4096 Oct 22 13:03 blinkenlights
> 204 -rw-r--r--  1 root root 4096 Oct 22 13:03 old_scheme_first
> 205 -rw-r--r--  1 root root 4096 Oct 22 13:03 use_both_schemes
> # cd /sys/module/usbcore/parameters/ ; strace ls -a
> (...snipped...)
> open(".", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
> fstat64(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
> fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
> getdents64(3, /* 7 entries */, 4096)    = 224
> getdents64(3, /* 0 entries */, 4096)    = 0
> close(3)                                = 0
> fstat64(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 0), ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb809b000
> write(1, "   .  ..  autosuspend  blinkenli"..., 72   .  ..  autosuspend  blinkenlights  old_scheme_first        use_both_schemes
> ) = 72
> munmap(0xb809b000, 4096)                = 0
> exit_group(0)                           = ?
> 
> ----------------------------------------
> Result of CONFIG_USB=m on Debian Sarge
> 
> # ls -ail /sys/module/usbcore/parameters/
> total 0
> 3007 drwxr-xr-x  2 root root    0 Oct 22 13:10 .
> 3005 drwxr-xr-x  6 root root    0 Oct 22 13:10 ..
> 3008 -rw-r--r--  1 root root 4096 Oct 22 13:10 autosuspend
> 3010 -r--r--r--  1 root root 4096 Oct 22 13:10 blinkenlights
> 3009 -r--r--r--  1 root root 4096 Oct 22 13:10 nousb
> 3011 -rw-r--r--  1 root root 4096 Oct 22 13:10 old_scheme_first
> 3013 -rw-r--r--  1 root root 4096 Oct 22 13:10 usbfs_snoop
> 3012 -rw-r--r--  1 root root 4096 Oct 22 13:10 use_both_schemes
> # cd /sys/module/usbcore/parameters/ ; strace ls -a
> (...snipped...)
> open(".", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
> fstat64(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
> fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
> getdents64(3, /* 8 entries */, 4096)    = 264
> getdents64(3, /* 0 entries */, 4096)    = 0
> close(3)                                = 0
> fstat64(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 0), ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb8081000
> write(1, ".  ..  autosuspend  blinkenlight"..., 90.  ..  autosuspend  blinkenlights  nousb  old_scheme_first  usbfs_snoop  use_both_schemes
> ) = 90
> munmap(0xb8081000, 4096)                = 0
> exit_group(0)                           = ?
> 
> ----------------------------------------
> Result of CONFIG_USB=y on CentOS 5.2
> 
> # ls -ail /sys/module/usbcore/parameters/
> total 0
> 200 drwxr-xr-x 2 root root    0 Oct 22 13:13 .
> 199 drwxr-xr-x 4 root root    0 Oct 22 13:13 ..
> 201 -rw-r--r-- 1 root root 4096 Oct 22 13:13 autosuspend
> 204 -r--r--r-- 1 root root 4096 Oct 22 13:13 blinkenlights
> 203 -rw-r--r-- 1 root root 4096 Oct 22 13:13 old_scheme_first
> 205 -rw-r--r-- 1 root root 4096 Oct 22 13:13 usbfs_snoop
> 202 -rw-r--r-- 1 root root 4096 Oct 22 13:13 use_both_schemes
> # cd /sys/module/usbcore/parameters/ ; strace ls -a
> (...snipped...)
> open(".", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
> fstat64(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
> fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
> getdents64(3, /* 7 entries */, 4096)    = 232
> getdents64(3, /* 0 entries */, 4096)    = 0
> close(3)                                = 0
> fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f94000
> write(1, ".  ..  autosuspend  blinkenlight"..., 83.  ..  autosuspend  blinkenlights  old_scheme_first  usbfs_snoop  use_both_schemes
> ) = 83
> close(1)                                = 0
> munmap(0xb7f94000, 4096)                = 0
> exit_group(0)                           = ?
> 
> ----------------------------------------
> Result of CONFIG_USB=m on CentOS 5.2
> 
> # ls -ail /sys/module/usbcore/parameters/
> total 0
> 2607 drwxr-xr-x 2 root root    0 Oct 22 13:19 .
> 2605 drwxr-xr-x 6 root root    0 Oct 22 13:19 ..
> 2609 -rw-r--r-- 1 root root 4096 Oct 22 13:19 autosuspend
> 2612 -r--r--r-- 1 root root 4096 Oct 22 13:19 blinkenlights
> 2608 -r--r--r-- 1 root root 4096 Oct 22 13:19 nousb
> 2611 -rw-r--r-- 1 root root 4096 Oct 22 13:19 old_scheme_first
> 2613 -rw-r--r-- 1 root root 4096 Oct 22 13:19 usbfs_snoop
> 2610 -rw-r--r-- 1 root root 4096 Oct 22 13:19 use_both_schemes
> # cd /sys/module/usbcore/parameters/ ; strace ls -a
> (...snipped...)
> open(".", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
> fstat64(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
> fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
> getdents64(3, /* 8 entries */, 4096)    = 264
> getdents64(3, /* 0 entries */, 4096)    = 0
> close(3)                                = 0
> open("/proc/meminfo", O_RDONLY)         = 3
> fstat64(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb805f000
> read(3, "MemTotal:      1018380 kB\nMemFre"..., 1024) = 806
> close(3)                                = 0
> munmap(0xb805f000, 4096)                = 0
> fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb805f000
> write(1, ".  ..  autosuspend  blinkenlight"..., 90.  ..  autosuspend  blinkenlights  nousb  old_scheme_first  usbfs_snoop  use_both_schemes
> ) = 90
> close(1)                                = 0
> munmap(0xb805f000, 4096)                = 0
> exit_group(0)                           = ?
> 
> ----------------------------------------
> 
> The difference between these results is that
> '205 -rw-r--r-- 1 root root 4096 Oct 22 13:13 usbfs_snoop' on CentOS 5.2 is
> reported as '200 drwxr-xr-x  2 root root    0 Oct 22 13:03' on Debian Sarge
> if CONFIG_USB=y.
> 
> Debian Sarge: gcc (GCC) 3.3.5 (Debian 1:3.3.5-13)
> CentOS 5.2:   gcc (GCC) 4.1.2 20071124 (Red Hat 4.1.2-42)

I really have no idea what is causing this, and can't seem to duplicate
this here at all.

Anyone else?

thanks,

greg k-h
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