x86: Sanitize smp_record and move it to x86_init_ops

The x86 quirkification introduced an extra ugly hackery with a
variable pointer in the mpparse code. If the pointer is initialized
then it is dereferenced and the variable set to 0 or incremented.

Create a x86_init_ops function and let the affected numaq code
hold the function. Default init is a setup noop.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index 9cba9d6..bbf2dfd 100644 (file)
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -25,7 +25,6 @@ struct x86_quirks {
        int (*mach_get_smp_config)(unsigned int early);
        int (*mach_find_smp_config)(unsigned int reserve);
 
-       int *mpc_record;
        int (*mpc_apic_id)(struct mpc_cpu *m);
        void (*mpc_oem_bus_info)(struct mpc_bus *m, char *name);
        void (*mpc_oem_pci_bus)(struct mpc_bus *m);

diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 6c084f2..10b297b 100644 (file)
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -2,6 +2,14 @@
 #define _ASM_X86_PLATFORM_H
 
 /**
+ * struct x86_init_mpparse - platform specific mpparse ops
+ * @mpc_record:                        platform specific mpc record accounting
+ */
+struct x86_init_mpparse {
+       void (*mpc_record)(unsigned int mode);
+};
+
+/**
  * struct x86_init_resources - platform specific resource related ops
  * @probe_roms:                        probe BIOS roms
  * @reserve_resources:         reserve the standard resources for the
@@ -22,11 +30,13 @@ struct x86_init_resources {
  *
  */
 struct x86_init_ops {
-       struct x86_init_resources resources;
+       struct x86_init_resources       resources;
+       struct x86_init_mpparse         mpparse;
 };
 
 extern struct x86_init_ops x86_init;
 
 extern void x86_init_noop(void);
+extern void x86_init_uint_noop(unsigned int unused);
 
 #endif

diff --git a/arch/x86/kernel/apic/numaq_32.c b/arch/x86/kernel/apic/numaq_32.c
index 403c062..b5f0b1d 100644 (file)
--- a/arch/x86/kernel/apic/numaq_32.c
+++ b/arch/x86/kernel/apic/numaq_32.c
@@ -66,7 +66,6 @@ struct mpc_trans {
        unsigned short                  trans_reserved;
 };
 
-/* x86_quirks member */
 static int                             mpc_record;
 
 static struct mpc_trans                        *translation_table[MAX_MPC_ENTRY];
@@ -177,6 +176,19 @@ static void mpc_oem_pci_bus(struct mpc_bus *m)
        quad_local_to_mp_bus_id[quad][local] = m->busid;
 }
 
+/*
+ * Called from mpparse code.
+ * mode = 0: prescan
+ * mode = 1: one mpc entry scanned
+ */
+static void numaq_mpc_record(unsigned int mode)
+{
+       if (!mode)
+               mpc_record = 0;
+       else
+               mpc_record++;
+}
+
 static void __init MP_translation_info(struct mpc_trans *m)
 {
        printk(KERN_INFO
@@ -264,7 +276,6 @@ static struct x86_quirks numaq_x86_quirks __initdata = {
        .arch_trap_init                 = NULL,
        .mach_get_smp_config            = NULL,
        .mach_find_smp_config           = NULL,
-       .mpc_record                     = &mpc_record,
        .mpc_apic_id                    = mpc_apic_id,
        .mpc_oem_bus_info               = mpc_oem_bus_info,
        .mpc_oem_pci_bus                = mpc_oem_pci_bus,
@@ -285,8 +296,10 @@ static __init void early_check_numaq(void)
        if (smp_found_config)
                early_get_smp_config();
 
-       if (found_numaq)
+       if (found_numaq) {
                x86_quirks = &numaq_x86_quirks;
+               x86_init.mpparse.mpc_record = numaq_mpc_record;
+       }
 }
 
 int __init get_memcfg_numaq(void)

diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index 651c93b..b2179fd 100644 (file)
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -320,8 +320,7 @@ static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
        /*
         *      Now process the configuration blocks.
         */
-       if (x86_quirks->mpc_record)
-               *x86_quirks->mpc_record = 0;
+       x86_init.mpparse.mpc_record(0);
 
        while (count < mpc->length) {
                switch (*mpt) {
@@ -353,8 +352,7 @@ static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
                        count = mpc->length;
                        break;
                }
-               if (x86_quirks->mpc_record)
-                       (*x86_quirks->mpc_record)++;
+               x86_init.mpparse.mpc_record(1);
        }
 
 #ifdef CONFIG_X86_BIGSMP

diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 1965bff..83bd5db 100644 (file)
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -10,6 +10,7 @@
 #include <asm/e820.h>
 
 void __cpuinit x86_init_noop(void) { }
+void __init x86_init_uint_noop(unsigned int unused) { }
 
 /*
  * The platform setup functions are preset with the default functions
@@ -23,4 +24,8 @@ struct __initdata x86_init_ops x86_init = {
                .reserve_ebda_region    = reserve_ebda_region,
                .memory_setup           = default_machine_specific_memory_setup,
        },
+
+       .mpparse = {
+               .mpc_record             = x86_init_uint_noop,
+       },
 };