BMC/Intel-BMC/linux.git/arch/x86/kernel/cpu/mtrr/cyrix.c, branch dev

x86: Store a per-cpu shadow copy of CR4

2015-02-04T11:10:42+00:00

Context switches and TLB flushes can change individual bits of CR4. CR4 reads take several cycles, so store a shadow copy of CR4 in a per-cpu variable. To avoid wasting a cache line, I added the CR4 shadow to cpu_tlbstate, which is already touched in switch_mm. The heaviest users of the cr4 shadow will be switch_mm and __switch_to_xtra, and __switch_to_xtra is called shortly after switch_mm during context switch, so the cacheline is likely to be hot. Signed-off-by: Andy Lutomirski Reviewed-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Cc: Kees Cook Cc: Andrea Arcangeli Cc: Vince Weaver Cc: "hillf.zj" Cc: Valdis Kletnieks Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo Cc: Linus Torvalds Link: http://lkml.kernel.org/r/3a54dd3353fffbf84804398e00dfdc5b7c1afd7d.1414190806.git.luto@amacapital.net Signed-off-by: Ingo Molnar

x86, asm, cleanup: Replace open-coded control register values with symbolic

2013-06-25T23:26:06+00:00

Clean up an unnecessary open-coded control register values. Signed-off-by: H. Peter Anvin Link: http://lkml.kernel.org/n/tip-um7za1nzf6brb17o0h4om6e3@git.kernel.org

x86, mtrr: Constify struct mtrr_ops

2010-02-01T19:20:43+00:00

This is part of the ops structure constification effort started by Arjan van de Ven et al. Benefits of this constification: * prevents modification of data that is shared (referenced) by many other structure instances at runtime * detects/prevents accidental (but not intentional) modification attempts on archs that enforce read-only kernel data at runtime * potentially better optimized code as the compiler can assume that the const data cannot be changed * the compiler/linker move const data into .rodata and therefore exclude them from false sharing Signed-off-by: Emese Revfy LKML-Reference: <4B65D712.3080804@gmail.com> Signed-off-by: H. Peter Anvin

x86: Clean up mtrr/cyrix.c

2009-07-04T09:10:47+00:00

Fix trivial style problems: WARNING: Use #include instead of WARNING: line over 80 characters ERROR: do not initialise statics to 0 or NULL ERROR: space prohibited after that open parenthesis '(' X 2 ERROR: space prohibited before that close parenthesis ')' X 2 ERROR: trailing whitespace X 2 ERROR: trailing statements should be on next line ERROR: do not use C99 // comments X 2 arch/x86/kernel/cpu/mtrr/cyrix.o: text data bss dec hex filename 1637 32 8 1677 68d cyrix.o.before 1637 32 8 1677 68d cyrix.o.after md5: 6f52abd06905be3f4cabb5239f9b0ff0 cyrix.o.before.asm 6f52abd06905be3f4cabb5239f9b0ff0 cyrix.o.after.asm Suggested-by: Alan Cox Signed-off-by: Jaswinder Singh Rajput Cc: Andrew Morton Cc: Yinghai Lu LKML-Reference: <20090703164225.GA21447@elte.hu> [ Made the code more consistent ] Signed-off-by: Ingo Molnar

x86: remove long dead cyrix mtrr code

2008-02-04T15:48:01+00:00

cyrix_arr_init was #if 0 all the way back to at least v2.6.12. This was the only place where arr3_protected was set to anything but zero. Eliminate this variable. Signed-off-by: Harvey Harrison Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner

x86: use CR0 defines.

2008-01-30T12:30:39+00:00

Signed-off-by: Dave Jones Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar

spelling fixes: arch/i386/

2007-10-19T23:13:56+00:00

Spelling fixes in arch/i386/. Signed-off-by: Simon Arlott Signed-off-by: Adrian Bunk

i386: move kernel/cpu/mtrr

2007-10-11T09:16:28+00:00

Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar