x86/entry/64: Remove all remaining direct thread_struct::sp0 reads

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commit 46f5a10a72 upstream.

The only remaining readers in context switch code or vm86(), and
they all just want to update TSS.sp0 to match the current task.
Replace them all with a new helper update_sp0().

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.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/2d231687f4ff288c9d9e98d7861b7df374246ac3.1509609304.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Andy Lutomirski 2017-11-02 00:59:14 -07:00 • committed by Greg Kroah-Hartman

parent 71d7244efb

commit c30eb760e3

4 changed files with 10 additions and 4 deletions

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6

arch/x86/include/asm/switch_to.h

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2

arch/x86/kernel/process_32.c

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2

arch/x86/kernel/process_64.c

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4

arch/x86/kernel/vm86_32.c

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