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    x86/fpu: Fix math emulation in eager fpu mode · 4ecd16ec
    Andy Lutomirski 提交于
    Systems without an FPU are generally old and therefore use lazy FPU
    switching. Unsurprisingly, math emulation in eager FPU mode is a
    bit buggy. Fix it.
    
    There were two bugs involving kernel code trying to use the FPU
    registers in eager mode even if they didn't exist and one BUG_ON()
    that was incorrect.
    Signed-off-by: NAndy Lutomirski <luto@kernel.org>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: Fenghua Yu <fenghua.yu@intel.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Oleg Nesterov <oleg@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
    Cc: Rik van Riel <riel@redhat.com>
    Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: yu-cheng yu <yu-cheng.yu@intel.com>
    Link: http://lkml.kernel.org/r/b4b8d112436bd6fab866e1b4011131507e8d7fbe.1453675014.git.luto@kernel.orgSigned-off-by: NIngo Molnar <mingo@kernel.org>
    4ecd16ec
traps.c 24.3 KB