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A bugfix commit:45dbea5f55("x86/paravirt: Fix native_patch()") ... introduced a harmless warning: arch/x86/kernel/paravirt_patch_32.c: In function 'native_patch': arch/x86/kernel/paravirt_patch_32.c:71:1: error: label 'patch_default' defined but not used [-Werror=unused-label] Fix it by annotating the label as __maybe_unused. Reported-by: Arnd Bergmann <arnd@arndb.de> Reported-by: Piotr Gregor <piotrgregor@rsyncme.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes:45dbea5f55("x86/paravirt: Fix native_patch()") Signed-off-by: Ingo Molnar <mingo@kernel.org>
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
#include <asm/paravirt.h>
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DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
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DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
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DEF_NATIVE(pv_irq_ops, restore_fl, "push %eax; popf");
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DEF_NATIVE(pv_irq_ops, save_fl, "pushf; pop %eax");
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DEF_NATIVE(pv_cpu_ops, iret, "iret");
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DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
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DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
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DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
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#if defined(CONFIG_PARAVIRT_SPINLOCKS)
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DEF_NATIVE(pv_lock_ops, queued_spin_unlock, "movb $0, (%eax)");
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DEF_NATIVE(pv_lock_ops, 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, u16 clobbers, void *ibuf,
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unsigned long addr, unsigned len)
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{
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const unsigned char *start, *end;
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unsigned ret;
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#define PATCH_SITE(ops, x) \
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case PARAVIRT_PATCH(ops.x): \
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start = start_##ops##_##x; \
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end = end_##ops##_##x; \
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goto patch_site
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switch (type) {
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PATCH_SITE(pv_irq_ops, irq_disable);
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PATCH_SITE(pv_irq_ops, irq_enable);
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PATCH_SITE(pv_irq_ops, restore_fl);
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PATCH_SITE(pv_irq_ops, save_fl);
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PATCH_SITE(pv_cpu_ops, iret);
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PATCH_SITE(pv_mmu_ops, read_cr2);
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PATCH_SITE(pv_mmu_ops, read_cr3);
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PATCH_SITE(pv_mmu_ops, write_cr3);
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#if defined(CONFIG_PARAVIRT_SPINLOCKS)
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case PARAVIRT_PATCH(pv_lock_ops.queued_spin_unlock):
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if (pv_is_native_spin_unlock()) {
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start = start_pv_lock_ops_queued_spin_unlock;
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end = end_pv_lock_ops_queued_spin_unlock;
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goto patch_site;
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}
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goto patch_default;
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case PARAVIRT_PATCH(pv_lock_ops.vcpu_is_preempted):
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if (pv_is_native_vcpu_is_preempted()) {
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start = start_pv_lock_ops_vcpu_is_preempted;
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end = end_pv_lock_ops_vcpu_is_preempted;
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goto patch_site;
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}
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goto patch_default;
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#endif
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default:
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patch_default: __maybe_unused
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ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
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break;
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patch_site:
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ret = paravirt_patch_insns(ibuf, len, start, end);
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break;
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}
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#undef PATCH_SITE
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return ret;
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}
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