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Commit 7847c7be authored by Juergen Gross's avatar Juergen Gross Committed by Ingo Molnar
Browse files

x86/paravirt: Remove unused _paravirt_ident_32 



There is no user of _paravirt_ident_32 left in the tree. Remove it
together with the related paravirt_patch_ident_32().

paravirt_patch_ident_64() can be moved inside CONFIG_PARAVIRT_XXL=y.

Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: akataria@vmware.com
Cc: boris.ostrovsky@oracle.com
Cc: rusty@rustcorp.com.au
Cc: virtualization@lists.linux-foundation.org
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/20181030063301.15054-1-jgross@suse.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent f77084d9

arch/x86/include/asm/paravirt_types.h

+0 −2
Original line number Diff line number Diff line
@@ -361,7 +361,6 @@ extern struct paravirt_patch_template pv_ops; 
	__visible extern const char start_##ops##_##name[], end_##ops##_##name[];	\

	asm(NATIVE_LABEL("start_", ops, name) code NATIVE_LABEL("end_", ops, name))



unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);

unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);

unsigned paravirt_patch_default(u8 type, void *insnbuf,

				unsigned long addr, unsigned len);
@@ -651,7 +650,6 @@ void paravirt_leave_lazy_mmu(void); 
void paravirt_flush_lazy_mmu(void);



void _paravirt_nop(void);

u32 _paravirt_ident_32(u32);

u64 _paravirt_ident_64(u64);



#define paravirt_nop	((void *)_paravirt_nop)

arch/x86/kernel/paravirt.c

+7 −19
Original line number Diff line number Diff line
@@ -56,17 +56,6 @@ asm (".pushsection .entry.text, \"ax\"\n" 
     ".type _paravirt_nop, @function\n\t"

     ".popsection");



/* identity function, which can be inlined */

u32 notrace _paravirt_ident_32(u32 x)

{

	return x;

}



u64 notrace _paravirt_ident_64(u64 x)

{

	return x;

}



void __init default_banner(void)

{

	printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
@@ -102,6 +91,12 @@ static unsigned paravirt_patch_call(void *insnbuf, const void *target, 
}



#ifdef CONFIG_PARAVIRT_XXL

/* identity function, which can be inlined */

u64 notrace _paravirt_ident_64(u64 x)

{

	return x;

}



static unsigned paravirt_patch_jmp(void *insnbuf, const void *target,

				   unsigned long addr, unsigned len)

{
@@ -146,13 +141,11 @@ unsigned paravirt_patch_default(u8 type, void *insnbuf, 
	else if (opfunc == _paravirt_nop)

		ret = 0;



#ifdef CONFIG_PARAVIRT_XXL

	/* identity functions just return their single argument */

	else if (opfunc == _paravirt_ident_32)

		ret = paravirt_patch_ident_32(insnbuf, len);

	else if (opfunc == _paravirt_ident_64)

		ret = paravirt_patch_ident_64(insnbuf, len);



#ifdef CONFIG_PARAVIRT_XXL

	else if (type == PARAVIRT_PATCH(cpu.iret) ||

		 type == PARAVIRT_PATCH(cpu.usergs_sysret64))

		/* If operation requires a jmp, then jmp */
@@ -309,13 +302,8 @@ struct pv_info pv_info = { 
#endif

};



#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_PAE)

/* 32-bit pagetable entries */

#define PTE_IDENT	__PV_IS_CALLEE_SAVE(_paravirt_ident_32)

#else

/* 64-bit pagetable entries */

#define PTE_IDENT	__PV_IS_CALLEE_SAVE(_paravirt_ident_64)

#endif



struct paravirt_patch_template pv_ops = {

	/* Init ops. */

arch/x86/kernel/paravirt_patch_32.c

+6 −12
Original line number Diff line number Diff line
@@ -10,24 +10,18 @@ DEF_NATIVE(cpu, iret, "iret"); 
DEF_NATIVE(mmu, read_cr2, "mov %cr2, %eax");

DEF_NATIVE(mmu, write_cr3, "mov %eax, %cr3");

DEF_NATIVE(mmu, read_cr3, "mov %cr3, %eax");

#endif



#if defined(CONFIG_PARAVIRT_SPINLOCKS)

DEF_NATIVE(lock, queued_spin_unlock, "movb $0, (%eax)");

DEF_NATIVE(lock, vcpu_is_preempted, "xor %eax, %eax");

#endif



unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)

{

	/* arg in %eax, return in %eax */

	return 0;

}



unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)

{

	/* arg in %edx:%eax, return in %edx:%eax */

	return 0;

}

#endif



#if defined(CONFIG_PARAVIRT_SPINLOCKS)

DEF_NATIVE(lock, queued_spin_unlock, "movb $0, (%eax)");

DEF_NATIVE(lock, vcpu_is_preempted, "xor %eax, %eax");

#endif



extern bool pv_is_native_spin_unlock(void);

extern bool pv_is_native_vcpu_is_preempted(void);

arch/x86/kernel/paravirt_patch_64.c

+6 −14
Original line number Diff line number Diff line
@@ -15,27 +15,19 @@ DEF_NATIVE(cpu, wbinvd, "wbinvd"); 


DEF_NATIVE(cpu, usergs_sysret64, "swapgs; sysretq");

DEF_NATIVE(cpu, swapgs, "swapgs");

#endif



DEF_NATIVE(, mov32, "mov %edi, %eax");

DEF_NATIVE(, mov64, "mov %rdi, %rax");



#if defined(CONFIG_PARAVIRT_SPINLOCKS)

DEF_NATIVE(lock, queued_spin_unlock, "movb $0, (%rdi)");

DEF_NATIVE(lock, vcpu_is_preempted, "xor %eax, %eax");

#endif



unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)

{

	return paravirt_patch_insns(insnbuf, len,

				    start__mov32, end__mov32);

}



unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)

{

	return paravirt_patch_insns(insnbuf, len,

				    start__mov64, end__mov64);

}

#endif



#if defined(CONFIG_PARAVIRT_SPINLOCKS)

DEF_NATIVE(lock, queued_spin_unlock, "movb $0, (%rdi)");

DEF_NATIVE(lock, vcpu_is_preempted, "xor %eax, %eax");

#endif



extern bool pv_is_native_spin_unlock(void);

extern bool pv_is_native_vcpu_is_preempted(void);