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authorDave Hansen <dave.hansen@linux.intel.com>2016-06-29 23:01:10 +0300
committerIngo Molnar <mingo@kernel.org>2016-06-30 10:11:32 +0300
commit8eda072e9d7c3429a372e3635dc5851f4a42dee1 (patch)
tree6993803c4833ce2947eb086196a6862e9a9a7282 /arch/x86/Makefile_32.cpu
parent1e61f78baf893c7eb49f633d23ccbb420c8f808e (diff)
downloadlinux-8eda072e9d7c3429a372e3635dc5851f4a42dee1.tar.xz
x86/cpufeature: Add helper macro for mask check macros
Every time we add a word to our cpu features, we need to add something like this in two places: (((bit)>>5)==16 && (1UL<<((bit)&31) & REQUIRED_MASK16)) The trick is getting the "16" in this case in both places. I've now screwed this up twice, so as pennance, I've come up with this patch to keep me and other poor souls from doing the same. I also commented the logic behind the bit manipulation showcased above. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave@sr71.net> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20160629200110.1BA8949E@viggo.jf.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/Makefile_32.cpu')
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