6672f76a5a
Currently the size of the per-cpu region reserved to save crash notes is set by the per-architecture value MAX_NOTE_BYTES. Which in turn is currently set to 1024 on all supported architectures. While testing ia64 I recently discovered that this value is in fact too small. The particular setup I was using actually needs 1172 bytes. This lead to very tedious failure mode where the tail of one elf note would overwrite the head of another if they ended up being alocated sequentially by kmalloc, which was often the case. It seems to me that a far better approach is to caclculate the size that the area needs to be. This patch does just that. If a simpler stop-gap patch for ia64 to be squeezed into 2.6.21(.X) is needed then this should be as easy as making MAX_NOTE_BYTES larger in arch/asm-ia64/kexec.h. Perhaps 2048 would be a good choice. However, I think that the approach in this patch is a much more robust idea. Acked-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Simon Horman <horms@verge.net.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
#ifndef _ASM_IA64_KEXEC_H
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#define _ASM_IA64_KEXEC_H
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/* Maximum physical address we can use pages from */
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#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
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/* Maximum address we can reach in physical address mode */
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#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
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/* Maximum address we can use for the control code buffer */
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#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
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#define KEXEC_CONTROL_CODE_SIZE (8192 + 8192 + 4096)
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/* The native architecture */
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#define KEXEC_ARCH KEXEC_ARCH_IA_64
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#define kexec_flush_icache_page(page) do { \
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unsigned long page_addr = (unsigned long)page_address(page); \
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flush_icache_range(page_addr, page_addr + PAGE_SIZE); \
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} while(0)
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extern struct kimage *ia64_kimage;
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extern const unsigned int relocate_new_kernel_size;
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extern void relocate_new_kernel(unsigned long, unsigned long,
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struct ia64_boot_param *, unsigned long);
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static inline void
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crash_setup_regs(struct pt_regs *newregs, struct pt_regs *oldregs)
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{
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}
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extern struct resource efi_memmap_res;
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extern struct resource boot_param_res;
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extern void kdump_smp_send_stop(void);
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extern void kdump_smp_send_init(void);
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extern void kexec_disable_iosapic(void);
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extern void crash_save_this_cpu(void);
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struct rsvd_region;
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extern unsigned long kdump_find_rsvd_region(unsigned long size,
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struct rsvd_region *rsvd_regions, int n);
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extern void kdump_cpu_freeze(struct unw_frame_info *info, void *arg);
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extern int kdump_status[];
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extern atomic_t kdump_cpu_freezed;
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extern atomic_t kdump_in_progress;
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#endif /* _ASM_IA64_KEXEC_H */
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