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Message-ID: <20061219051539.GA26052@in.ibm.com>
Date: Tue, 19 Dec 2006 10:45:39 +0530
From: Vivek Goyal <vgoyal@...ibm.com>
To: linux kernel mailing list <linux-kernel@...r.kernel.org>,
Fastboot mailing list <fastboot@...ts.osdl.org>
Cc: Morton Andrew Morton <akpm@...l.org>, Andi Kleen <ak@....de>,
sam@...nborg.org, Srivatsa Vaddagiri <vatsa@...ibm.com>,
gautham R Shenoy <ego@...ibm.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 1/5] i386: cpu hotplug/smpboot misc MODPOST warning fixes
o Misc smpboot/cpu hotplug path cleanups. I did those to supress the
warnings generated by MODPOST. These warnings are visible only
if CONFIG_RELOCATABLE=y.
o CONFIG_RELOCATABLE compiles the kernel with --emit-relocs option. This
option retains relocation information in vmlinux file and MODPOST
is quick to spit out "Section mismatch" warnings.
o This patch fixes some of those warnings. Many of the functions in
smpboot case are __devinit type and they in turn accesses text/data which
if of type __cpuinit. Now if CONFIG_HOTPLUG=y and CONFIG_HOTPLUG_CPU=n
then we end up in cases where a function in .text segment is calling
another function in .init.text segment and MODPOST emits warning.
WARNING: vmlinux - Section mismatch: reference to .init.text:identify_cpu from .text between 'smp_store_cpu_info' (at offset 0xc011020d) and 'do_boot_cpu'
WARNING: vmlinux - Section mismatch: reference to .init.text:init_gdt from .text between 'do_boot_cpu' (at offset 0xc01102ca) and '__cpu_up'
WARNING: vmlinux - Section mismatch: reference to .init.text:print_cpu_info from .text between 'do_boot_cpu' (at offset 0xc01105d0) and '__cpu_up'
o It also fixes the issues where CONFIG_HOTPLUG_CPU=y and start_secondary()
is calling smp_callin() which in-turn calls synchronize_tsc_ap() which is
of type __init. This should have meant broken CPU hotplug.
WARNING: vmlinux - Section mismatch: reference to .init.data: from .text between 'start_secondary' (at offset 0xc011603f) and 'initialize_secondary'
WARNING: vmlinux - Section mismatch: reference to .init.data: from .text between 'MP_processor_info' (at offset 0xc0116a4f) and 'mp_register_lapic'
WARNING: vmlinux - Section mismatch: reference to .init.data: from .text between 'MP_processor_info' (at offset 0xc0116a4f) and 'mp_register_lapic'
Signed-off-by: Vivek Goyal <vgoyal@...ibm.com>
---
arch/i386/kernel/mpparse.c | 8 ++++----
arch/i386/kernel/setup.c | 2 +-
arch/i386/kernel/smpboot.c | 10 +++++-----
3 files changed, 10 insertions(+), 10 deletions(-)
diff -puN arch/i386/kernel/mpparse.c~i386-cpu-hotplug-make-new-cpu-data-devinitdata arch/i386/kernel/mpparse.c
--- linux-2.6.19-rc1-reloc/arch/i386/kernel/mpparse.c~i386-cpu-hotplug-make-new-cpu-data-devinitdata 2006-12-15 14:08:55.000000000 +0530
+++ linux-2.6.19-rc1-reloc-root/arch/i386/kernel/mpparse.c 2006-12-15 14:08:55.000000000 +0530
@@ -36,7 +36,7 @@
/* Have we found an MP table */
int smp_found_config;
-unsigned int __initdata maxcpus = NR_CPUS;
+unsigned int __cpuinitdata maxcpus = NR_CPUS;
/*
* Various Linux-internal data structures created from the
@@ -102,9 +102,9 @@ static int __init mpf_checksum(unsigned
*/
static int mpc_record;
-static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY] __initdata;
+static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY] __cpuinitdata;
-static void __devinit MP_processor_info (struct mpc_config_processor *m)
+static void __cpuinit MP_processor_info (struct mpc_config_processor *m)
{
int ver, apicid;
physid_mask_t phys_cpu;
@@ -822,7 +822,7 @@ void __init mp_register_lapic_address(u6
Dprintk("Boot CPU = %d\n", boot_cpu_physical_apicid);
}
-void __devinit mp_register_lapic (u8 id, u8 enabled)
+void __cpuinit mp_register_lapic (u8 id, u8 enabled)
{
struct mpc_config_processor processor;
int boot_cpu = 0;
diff -puN arch/i386/kernel/setup.c~i386-cpu-hotplug-make-new-cpu-data-devinitdata arch/i386/kernel/setup.c
--- linux-2.6.19-rc1-reloc/arch/i386/kernel/setup.c~i386-cpu-hotplug-make-new-cpu-data-devinitdata 2006-12-15 14:08:55.000000000 +0530
+++ linux-2.6.19-rc1-reloc-root/arch/i386/kernel/setup.c 2006-12-15 14:10:35.000000000 +0530
@@ -77,7 +77,7 @@ extern struct resource code_resource;
extern struct resource data_resource;
/* cpu data as detected by the assembly code in head.S */
-struct cpuinfo_x86 new_cpu_data __initdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
+struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
/* common cpu data for all cpus */
struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
EXPORT_SYMBOL(boot_cpu_data);
diff -puN arch/i386/kernel/smpboot.c~i386-cpu-hotplug-make-new-cpu-data-devinitdata arch/i386/kernel/smpboot.c
--- linux-2.6.19-rc1-reloc/arch/i386/kernel/smpboot.c~i386-cpu-hotplug-make-new-cpu-data-devinitdata 2006-12-15 14:08:55.000000000 +0530
+++ linux-2.6.19-rc1-reloc-root/arch/i386/kernel/smpboot.c 2006-12-15 14:08:55.000000000 +0530
@@ -159,7 +159,7 @@ void __init smp_alloc_memory(void)
* a given CPU
*/
-static void __devinit smp_store_cpu_info(int id)
+static void __cpuinit smp_store_cpu_info(int id)
{
struct cpuinfo_x86 *c = cpu_data + id;
@@ -364,7 +364,7 @@ extern void calibrate_delay(void);
static atomic_t init_deasserted;
-static void __devinit smp_callin(void)
+static void __cpuinit smp_callin(void)
{
int cpuid, phys_id;
unsigned long timeout;
@@ -538,7 +538,7 @@ set_cpu_sibling_map(int cpu)
/*
* Activate a secondary processor.
*/
-static void __devinit start_secondary(void *unused)
+static void __cpuinit start_secondary(void *unused)
{
/*
* Don't put *anything* before secondary_cpu_init(), SMP
@@ -931,7 +931,7 @@ static inline struct task_struct * alloc
#define alloc_idle_task(cpu) fork_idle(cpu)
#endif
-static int __devinit do_boot_cpu(int apicid, int cpu)
+static int __cpuinit do_boot_cpu(int apicid, int cpu)
/*
* NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad
* (ie clustered apic addressing mode), this is a LOGICAL apic ID.
@@ -1432,7 +1432,7 @@ void __cpu_die(unsigned int cpu)
}
#endif /* CONFIG_HOTPLUG_CPU */
-int __devinit __cpu_up(unsigned int cpu)
+int __cpuinit __cpu_up(unsigned int cpu)
{
#ifdef CONFIG_HOTPLUG_CPU
int ret=0;
_
-
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