alpha: agp: make empty macros use do-while-0 style
Copy these macros from ia64/include/asm/agp.h to avoid the "empty-body" in 'if' statment warning. drivers/char/agp/generic.c: In function 'agp_generic_destroy_page': ../drivers/char/agp/generic.c:1265:42: warning: suggest braces around empty body in an 'if' statement [-Wempty-body] 1265 | unmap_page_from_agp(page); Link: https://lkml.kernel.org/r/20210809030822.20658-1-rdunlap@infradead.org Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: David Airlie <airlied@linux.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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