Messages in this thread | | | Date | Fri, 7 Aug 2020 17:05:26 +0200 | From | Luc Van Oostenryck <> | Subject | Re: fs/erofs/zdata.c:198:22: sparse: sparse: non size-preserving integer to pointer cast |
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On Fri, Aug 07, 2020 at 10:48:12PM +0800, Gao Xiang wrote: > On Fri, Aug 07, 2020 at 08:08:10PM +0800, kernel test robot wrote: > > sparse warnings: (new ones prefixed by >>) > > > > >> fs/erofs/zdata.c:198:22: sparse: sparse: non size-preserving integer to pointer cast > > fs/erofs/zdata.c:282:22: sparse: sparse: non size-preserving integer to pointer cast > > fs/erofs/zdata.c:1094:24: sparse: sparse: non size-preserving integer to pointer cast > > I don't think these are valid warnings.
Indeed, they're not.
> All these three lines are using cmpxchg struct page * (which is equivalent to unsigned long > in these cmpxchg macros) and nothing special at all in my opinion (Especially the last two > lines).
What is special is that s390 use __sync_val_compare_and_swap() to implement cmpxchg(). This builtin has a return type which depends on its arguments while sparse was always using 'int' as the return type.
A patch is on the way.
Regards, -- Luc Van Oostenryck
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