lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

FRV: Fix the section attribute on UP DECLARE_PER_CPU()

Browse Source 
In non-SMP mode, the variable section attribute specified by DECLARE_PER_CPU()
does not agree with that specified by DEFINE_PER_CPU().  This means that
architectures that have a small data section references relative to a base
register may throw up linkage errors due to too great a displacement between
where the base register points and the per-CPU variable.

On FRV, the .h declaration says that the variable is in the .sdata section, but
the .c definition says it's actually in the .data section.  The linker throws
up the following errors:

kernel/built-in.o: In function `release_task':
kernel/exit.c:78: relocation truncated to fit: R_FRV_GPREL12 against symbol `per_cpu__process_counts' defined in .data section in kernel/built-in.o
kernel/exit.c:78: relocation truncated to fit: R_FRV_GPREL12 against symbol `per_cpu__process_counts' defined in .data section in kernel/built-in.o

To fix this, DECLARE_PER_CPU() should simply apply the same section attribute
as does DEFINE_PER_CPU().  However, this is made slightly more complex by
virtue of the fact that there are several variants on DEFINE, so these need to
be matched by variants on DECLARE.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells
2009-04-21 23:00:24 +01:00
committed by Linus Torvalds
parent ccc5ff94c6
commit 9b8de7479d
9 changed files with 50 additions and 35 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/desc.h
View File

@@ -37,7 +37,7 @@ extern gate_desc idt_table[];
struct gdt_page {
struct desc_struct gdt[GDT_ENTRIES];
} __attribute__((aligned(PAGE_SIZE)));
DECLARE_PER_CPU(struct gdt_page, gdt_page);
DECLARE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page);
static inline struct desc_struct *get_cpu_gdt_table(unsigned int cpu)
{

2
arch/x86/include/asm/hardirq.h
View File

@@ -26,7 +26,7 @@ typedef struct {
#endif
} ____cacheline_aligned irq_cpustat_t;
DECLARE_PER_CPU(irq_cpustat_t, irq_stat);
DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
/* We can have at most NR_VECTORS irqs routed to a cpu at a time */
#define MAX_HARDIRQS_PER_CPU NR_VECTORS

6
arch/x86/include/asm/processor.h
View File

@@ -138,7 +138,7 @@ extern struct tss_struct doublefault_tss;
extern __u32 cleared_cpu_caps[NCAPINTS];
#ifdef CONFIG_SMP
DECLARE_PER_CPU(struct cpuinfo_x86, cpu_info);
DECLARE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
#define cpu_data(cpu) per_cpu(cpu_info, cpu)
#define current_cpu_data __get_cpu_var(cpu_info)
#else
@@ -270,7 +270,7 @@ struct tss_struct {
} ____cacheline_aligned;
DECLARE_PER_CPU(struct tss_struct, init_tss);
DECLARE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss);
/*
* Save the original ist values for checking stack pointers during debugging
@@ -393,7 +393,7 @@ union irq_stack_union {
};
};
DECLARE_PER_CPU(union irq_stack_union, irq_stack_union);
DECLARE_PER_CPU_FIRST(union irq_stack_union, irq_stack_union);
DECLARE_INIT_PER_CPU(irq_stack_union);
DECLARE_PER_CPU(char *, irq_stack_ptr);

2
arch/x86/include/asm/tlbflush.h
View File

@@ -152,7 +152,7 @@ struct tlb_state {
struct mm_struct *active_mm;
int state;
};
DECLARE_PER_CPU(struct tlb_state, cpu_tlbstate);
DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
static inline void reset_lazy_tlbstate(void)
{