i387: fix up some fpu_counter confusion

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This makes sure we clear the FPU usage counter for newly created tasks,
just so that we start off in a known state (for example, don't try to
preload the FPU state on the first task switch etc).

It also fixes a thinko in when we increment the fpu_counter at task
switch time, introduced by commit 34ddc81a23 ("i387: re-introduce FPU
state preloading at context switch time").  We should increment the
*new* task fpu_counter, not the old task, and only if we decide to use
that state (whether lazily or preloaded).

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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This commit is contained in:

Linus Torvalds 2012-02-20 10:24:09 -08:00

parent b01543dfe6

commit cea20ca3f3

3 changed files with 4 additions and 1 deletions

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3

arch/x86/include/asm/i387.h

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1

arch/x86/kernel/process_32.c

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1

arch/x86/kernel/process_64.c

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