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authorJeremy Fitzhardinge2009-09-03 12:27:15 -0700
committerIngo Molnar2009-09-03 21:30:51 +0200
commit1ea0d14e480c245683927eecc03a70faf06e80c8 (patch)
treecc43a6966799aa55c0f076c1217c557fb107563c /drivers/power
parent23386d63bbb3199cf247313ec088878d72debcfd (diff)
x86/i386: Make sure stack-protector segment base is cache aligned
The Intel Optimization Reference Guide says: In Intel Atom microarchitecture, the address generation unit assumes that the segment base will be 0 by default. Non-zero segment base will cause load and store operations to experience a delay. - If the segment base isn't aligned to a cache line boundary, the max throughput of memory operations is reduced to one [e]very 9 cycles. [...] Assembly/Compiler Coding Rule 15. (H impact, ML generality) For Intel Atom processors, use segments with base set to 0 whenever possible; avoid non-zero segment base address that is not aligned to cache line boundary at all cost. We can't avoid having a non-zero base for the stack-protector segment, but we can make it cache-aligned. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: <stable@kernel.org> LKML-Reference: <4AA01893.6000507@goop.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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