On Tue, Jul 13, 2004 at 13:12:25 +0530, aksingh@hss.hns.com wrote: > On Tue, Jul 13, 2004 at 09:14:58 +0530, aksingh@hss.hns.com wrote: > > Is it "mandatory" to set the owner of a file operations structure using > > this macro defined in module.h ?, doing a normal MOD_INC_USE_COUNT and > > MOD_DEC_USE_COUNT doesnt this work just fine too .. ..? > > MOD_INC_USE_COUNT and MOD_DEC_USE_COUNT do *NEVER* work. > >>> never work as in ? the module usage count does increment/decrement > using these No. Never work as in don't really prevent it from crashing. When the module itself does it's own refcounting, there is always a window, where the count is 0, but code from that module runs. It was not a problem back on non-preemptible UP kernels, but on SMP and especialy with preemption, it may cause a crash. ------------------------------------------------------------------------------- Jan 'Bulb' Hudec <bulb@ucw.cz>
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