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3637897b6c
When CONFIG_PARAVIRT_SPINLOCKS=n, it generates a warning: arch/x86/kernel/paravirt_patch_64.c: In function ‘native_patch’: arch/x86/kernel/paravirt_patch_64.c:89:1: warning: label ‘patch_site’ defined but not used [-Wunused-label] patch_site: ... but those labels can simply be removed by directly calling the respective functions there. Get rid of local variables too, while at it. Also, simplify function flow for better readability. Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: virtualization@lists.linux-foundation.org Link: http://lkml.kernel.org/r/20180911091510.GA12094@zn.tnic Signed-off-by: Ingo Molnar <mingo@kernel.org>
73 lines
2 KiB
C
73 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <asm/paravirt.h>
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#ifdef CONFIG_PARAVIRT_XXL
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DEF_NATIVE(irq, irq_disable, "cli");
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DEF_NATIVE(irq, irq_enable, "sti");
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DEF_NATIVE(irq, restore_fl, "push %eax; popf");
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DEF_NATIVE(irq, save_fl, "pushf; pop %eax");
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DEF_NATIVE(cpu, iret, "iret");
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DEF_NATIVE(mmu, read_cr2, "mov %cr2, %eax");
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DEF_NATIVE(mmu, write_cr3, "mov %eax, %cr3");
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DEF_NATIVE(mmu, read_cr3, "mov %cr3, %eax");
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#endif
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#if defined(CONFIG_PARAVIRT_SPINLOCKS)
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DEF_NATIVE(lock, queued_spin_unlock, "movb $0, (%eax)");
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DEF_NATIVE(lock, vcpu_is_preempted, "xor %eax, %eax");
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#endif
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unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
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{
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/* arg in %eax, return in %eax */
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return 0;
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}
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unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
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{
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/* arg in %edx:%eax, return in %edx:%eax */
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return 0;
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}
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extern bool pv_is_native_spin_unlock(void);
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extern bool pv_is_native_vcpu_is_preempted(void);
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unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len)
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{
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#define PATCH_SITE(ops, x) \
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case PARAVIRT_PATCH(ops.x): \
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return paravirt_patch_insns(ibuf, len, start_##ops##_##x, end_##ops##_##x)
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switch (type) {
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#ifdef CONFIG_PARAVIRT_XXL
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PATCH_SITE(irq, irq_disable);
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PATCH_SITE(irq, irq_enable);
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PATCH_SITE(irq, restore_fl);
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PATCH_SITE(irq, save_fl);
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PATCH_SITE(cpu, iret);
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PATCH_SITE(mmu, read_cr2);
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PATCH_SITE(mmu, read_cr3);
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PATCH_SITE(mmu, write_cr3);
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#endif
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#if defined(CONFIG_PARAVIRT_SPINLOCKS)
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case PARAVIRT_PATCH(lock.queued_spin_unlock):
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if (pv_is_native_spin_unlock())
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return paravirt_patch_insns(ibuf, len,
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start_lock_queued_spin_unlock,
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end_lock_queued_spin_unlock);
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break;
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case PARAVIRT_PATCH(lock.vcpu_is_preempted):
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if (pv_is_native_vcpu_is_preempted())
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return paravirt_patch_insns(ibuf, len,
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start_lock_vcpu_is_preempted,
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end_lock_vcpu_is_preempted);
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break;
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#endif
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default:
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break;
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}
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#undef PATCH_SITE
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return paravirt_patch_default(type, ibuf, addr, len);
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}
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