x86/cpu: Get rid of redundant switch_to_new_gdt() invocations

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The only place where switch_to_new_gdt() is required is early boot to
switch from the early GDT to the direct GDT. Any other invocation is
completely redundant because it does not change anything.

Secondary CPUs come out of the ASM code with GDT and GSBASE correctly set
up. The same is true for XEN_PV.

Remove all the voodoo invocations which are left overs from the ancient
past, rename the function to switch_gdt_and_percpu_base() and mark it init.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220915111143.198076128@infradead.org

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Thomas Gleixner 2022-09-15 13:10:42 +02:00 • committed by Peter Zijlstra

parent b5636d45aa

commit 1f19e2d50b

5 changed files with 14 additions and 15 deletions

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2

arch/x86/include/asm/processor.h

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17

arch/x86/kernel/cpu/common.c

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2

arch/x86/kernel/setup_percpu.c

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6

arch/x86/kernel/smpboot.c

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2

arch/x86/xen/enlighten_pv.c

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