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Date: Wed, 11 Aug 2010 00:35:51 -0700 From: Dmitry Torokhov <dtor@...are.com> To: Rusty Russell <rusty@...tcorp.com.au> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Len Brown <lenb@...nel.org> Subject: Re: [PATCH 1/2] param: allow omitting set() methods for truly read-only params On Aug 10, 2010, at 6:39 PM, "Rusty Russell" <rusty@...tcorp.com.au> wrote: > On Wed, 11 Aug 2010 04:28:44 am Dmitry Torokhov wrote: >> Certain "parameters", such as acpica version and upcoming VMware >> Balloon >> version, are need to be purely read-only. They are exported as >> parameters so that they are visible in sysfs even in cases when the >> module is built directly into the kernel, but their values should be >> immutable. Specifying S_IRUGO takes care of sysfs interface, but it >> has no effect on kernel command line or modprobe configuration >> files and >> so these "parameters" attempt to omit set() method. Unfortunately >> kernel expects set() to be always present and crashes if it is not >> there, so let's add appropriate check. >> >> Signed-off-by: Dmitry Torokhov <dtor@...are.com> > > That almost makes sense, but not quite. > > Your followup patch uses this for version, but the version is already > in /sys/module/vmware_balloon/version as is standard with modules, no? > That version attribute is not present if the driver is built-in, only parameters are visible in both cases. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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