> -----Original Message----- > From: Rusty Russell [mailto:[email protected]] > Sent: Tuesday, January 20, 2015 2:33 PM > To: Wang, Yalin; '[email protected]'; '[email protected]'; > '[email protected]'; '[email protected]'; '[email protected]'; 'linux- > [email protected]' > Subject: Re: [RFC] export module parameters even the permission is zero > > "Wang, Yalin" <[email protected]> writes: > > This patch make sure to export module parameters even the permission > > is zero, this is useful for some platforms like Android, the init > > process can change the parameter mode/owner by chmod/chown during > > bootup > > > > Signed-off-by: Yalin Wang <[email protected]> > > Hi! > > Unfortunately, this won't work. Various parts of the code assume > that 0 permissions means "cannot be changed or read", so this change would > introduce many bugs (eg. the parameter could be __initdata). > > Since these are owned by root at boot, changing mode and owner should still > work. However, you can't make a read-only field writable and expect it to > work. > Oh, I see, This means kernel cmdline can change this module_parameter ignored permission,
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