From: Joe Perches > Sent: 17 October 2020 01:12 > > On Fri, 2020-10-16 at 23:33 +0100, Colin King wrote: > > From: Colin Ian King <colin.king@xxxxxxxxxxxxx> > > > > Don't populate const array filter_ies on the stack but instead > > make it static. Makes the object code smaller by 261 bytes. > > > > Before: > > text data bss dec hex filename > > 21674 3166 448 25288 62c8 drivers/staging/wfx/sta.o > > > > After: > > text data bss dec hex filename > > 21349 3230 448 25027 61c3 drivers/staging/wfx/sta.o > > Thanks. > > It's odd to me it's so large a change as it's only > 24 bytes of initialization. (3 entries, each 8 bytes) Perhaps the 'stack protector' crap? Interestingly, loading the data from the 'readonly' section is probably a data cache miss. Which might end up being slower than the extra code to update the on-stack data. The extra code might get prefetched... David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
