Joe Perches, le ven. 22 mai 2020 09:36:05 -0700, a ecrit: > On Fri, 2020-05-22 at 13:34 +0300, Dan Carpenter wrote: > > On Fri, May 22, 2020 at 02:46:28PM +0530, MugilRaj wrote: > > > fix checkpatch.pl warning, which is Use of volatile is usually wrong: see > > > Documentation/process/volatile-considered-harmful.rst > > > Signed-off-by: MugilRaj <dmugil2000@xxxxxxxxx> > > > > Please put a blank before the Signed-off-by line. > > > > Probably there should be a space between your first and last name. It's > > supposed to your legal name like for signing a legal document so use > > whatever is appropriate legal documents in your country. > > > > Also the Documentation/process/volatile-considered-harmful.rst explains > > that people often use "volatile" when they should be using locking for > > synchronization. That seems to be the case here. So the correct fix is > > to add locking. That's a little bit complicated to do and requires > > testing. > > > > If we apply this patch, then we have silenced the warning so now someone > > will have to look for the bug. But if we leave it as-is, then everyone > > will know that the code is buggy. So let's leave it as-is until we are > > able to fix the bug. > > > > It's always better to have easy to find bugs, than hidden bugs. > > And better still to comment known opportunities to > improve the code so the next time someone tries to > remove this volatile, there's a comment right there > showing what's necessary instead. Actually I don't think adding the suggestion is a good thing if it's only a "rule-of-thumb-replace-volatile-with-lock". Actually possibly volatile might not even be needed because there could be already a lock protecting this. Put another way: I don't think putting any hint here would help, on the contrary, somebody has to really look at what protection is needed, without getting influenced by rules-of-thumb. Samuel _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
