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-rw-r--r--arch/x86/kernel/cpu/bugs.c27
1 files changed, 19 insertions, 8 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 170d2f5523b2..1b1c56bb338f 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -59,8 +59,12 @@ static void __init check_fpu(void)
59 return; 59 return;
60 } 60 }
61 61
62/* trap_init() enabled FXSR and company _before_ testing for FP problems here. */ 62 /*
63 /* Test for the divl bug.. */ 63 * trap_init() enabled FXSR and company _before_ testing for FP
64 * problems here.
65 *
66 * Test for the divl bug..
67 */
64 __asm__("fninit\n\t" 68 __asm__("fninit\n\t"
65 "fldl %1\n\t" 69 "fldl %1\n\t"
66 "fdivl %2\n\t" 70 "fdivl %2\n\t"
@@ -108,10 +112,15 @@ static void __init check_popad(void)
108 "movl $12345678,%%eax; movl $0,%%edi; pusha; popa; movl (%%edx,%%edi),%%ecx " 112 "movl $12345678,%%eax; movl $0,%%edi; pusha; popa; movl (%%edx,%%edi),%%ecx "
109 : "=&a" (res) 113 : "=&a" (res)
110 : "d" (inp) 114 : "d" (inp)
111 : "ecx", "edi" ); 115 : "ecx", "edi");
112 /* If this fails, it means that any user program may lock the CPU hard. Too bad. */ 116 /*
113 if (res != 12345678) printk( "Buggy.\n" ); 117 * If this fails, it means that any user program may lock the
114 else printk( "OK.\n" ); 118 * CPU hard. Too bad.
119 */
120 if (res != 12345678)
121 printk("Buggy.\n");
122 else
123 printk("OK.\n");
115#endif 124#endif
116} 125}
117 126
@@ -137,7 +146,8 @@ static void __init check_config(void)
137 * i486+ only features! (WP works in supervisor mode and the 146 * i486+ only features! (WP works in supervisor mode and the
138 * new "invlpg" and "bswap" instructions) 147 * new "invlpg" and "bswap" instructions)
139 */ 148 */
140#if defined(CONFIG_X86_WP_WORKS_OK) || defined(CONFIG_X86_INVLPG) || defined(CONFIG_X86_BSWAP) 149#if defined(CONFIG_X86_WP_WORKS_OK) || defined(CONFIG_X86_INVLPG) || \
150 defined(CONFIG_X86_BSWAP)
141 if (boot_cpu_data.x86 == 3) 151 if (boot_cpu_data.x86 == 3)
142 panic("Kernel requires i486+ for 'invlpg' and other features"); 152 panic("Kernel requires i486+ for 'invlpg' and other features");
143#endif 153#endif
@@ -170,6 +180,7 @@ void __init check_bugs(void)
170 check_fpu(); 180 check_fpu();
171 check_hlt(); 181 check_hlt();
172 check_popad(); 182 check_popad();
173 init_utsname()->machine[1] = '0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86); 183 init_utsname()->machine[1] =
184 '0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86);
174 alternative_instructions(); 185 alternative_instructions();
175} 186}