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Commit f2ab4461 authored by Zachary Amsden's avatar Zachary Amsden Committed by Linus Torvalds
Browse files

[PATCH] x86: more asm cleanups 



Some more assembler cleanups I noticed along the way.

Signed-off-by: default avatarZachary Amsden <zach@vmware.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 4f0cb8d9

arch/i386/kernel/cpu/intel.c

+3 −6
Original line number Diff line number Diff line
@@ -82,16 +82,13 @@ static void __devinit Intel_errata_workarounds(struct cpuinfo_x86 *c) 
 */

static int __devinit num_cpu_cores(struct cpuinfo_x86 *c)

{

	unsigned int eax;

	unsigned int eax, ebx, ecx, edx;



	if (c->cpuid_level < 4)

		return 1;



	__asm__("cpuid"

		: "=a" (eax)

		: "0" (4), "c" (0)

		: "bx", "dx");



	/* Intel has a non-standard dependency on %ecx for this CPUID level. */

	cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);

	if (eax & 0x1f)

		return ((eax >> 26) + 1);

	else

arch/i386/kernel/crash.c

+1 −1
Original line number Diff line number Diff line
@@ -153,7 +153,7 @@ static int crash_nmi_callback(struct pt_regs *regs, int cpu) 
	disable_local_APIC();

	atomic_dec(&waiting_for_crash_ipi);

	/* Assume hlt works */

	__asm__("hlt");

	halt();

	for(;;);



	return 1;

arch/i386/kernel/machine_kexec.c

+2 −8
Original line number Diff line number Diff line
@@ -93,10 +93,7 @@ static void set_idt(void *newidt, __u16 limit) 
	curidt.size    = limit;

	curidt.address = (unsigned long)newidt;



	__asm__ __volatile__ (

		"lidtl %0\n"

		: : "m" (curidt)

		);

	load_idt(&curidt);

};
@@ -108,10 +105,7 @@ static void set_gdt(void *newgdt, __u16 limit) 
	curgdt.size    = limit;

	curgdt.address = (unsigned long)newgdt;



	__asm__ __volatile__ (

		"lgdtl %0\n"

		: : "m" (curgdt)

		);

	load_gdt(&curgdt);

};



static void load_segments(void)

arch/i386/kernel/msr.c

+6 −25
Original line number Diff line number Diff line
@@ -46,23 +46,13 @@ 


static struct class *msr_class;



/* Note: "err" is handled in a funny way below.  Otherwise one version

   of gcc or another breaks. */



static inline int wrmsr_eio(u32 reg, u32 eax, u32 edx)

{

	int err;



	asm volatile ("1:	wrmsr\n"

		      "2:\n"

		      ".section .fixup,\"ax\"\n"

		      "3:	movl %4,%0\n"

		      "	jmp 2b\n"

		      ".previous\n"

		      ".section __ex_table,\"a\"\n"

		      "	.align 4\n" "	.long 1b,3b\n" ".previous":"=&bDS" (err)

		      :"a"(eax), "d"(edx), "c"(reg), "i"(-EIO), "0"(0));



	err = wrmsr_safe(reg, eax, edx);

	if (err)

		err = -EIO;

	return err;

}
@@ -70,18 +60,9 @@ static inline int rdmsr_eio(u32 reg, u32 *eax, u32 *edx) 
{

	int err;



	asm volatile ("1:	rdmsr\n"

		      "2:\n"

		      ".section .fixup,\"ax\"\n"

		      "3:	movl %4,%0\n"

		      "	jmp 2b\n"

		      ".previous\n"

		      ".section __ex_table,\"a\"\n"

		      "	.align 4\n"

		      "	.long 1b,3b\n"

		      ".previous":"=&bDS" (err), "=a"(*eax), "=d"(*edx)

		      :"c"(reg), "i"(-EIO), "0"(0));



	err = rdmsr_safe(reg, eax, edx);

	if (err)

		err = -EIO;

	return err;

}

arch/i386/kernel/process.c

+1 −1
Original line number Diff line number Diff line
@@ -164,7 +164,7 @@ static inline void play_dead(void) 
	 */

	local_irq_disable();

	while (1)

		__asm__ __volatile__("hlt":::"memory");

		halt();

}

#else

static inline void play_dead(void)