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kexec/i386: allocate page table pages dynamically

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Impact: save .text size when kexec is built in but not loaded

This patch adds an architecture specific struct kimage_arch into
struct kimage. The pointers to page table pages used by kexec are
added to struct kimage_arch. The page tables pages are dynamically
allocated in machine_kexec_prepare instead of statically from BSS
segment. This will save up to 20k memory when kexec image is not
loaded.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Huang Ying
2008-10-31 09:48:08 +08:00
committed by Ingo Molnar
parent 31498a0149
commit 92be3d6bdf
3 changed files with 64 additions and 21 deletions
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14
arch/x86/include/asm/kexec.h
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@@ -170,6 +170,20 @@ relocate_kernel(unsigned long indirection_page,
unsigned long start_address) ATTRIB_NORET;
#endif
#ifdef CONFIG_X86_32
#define ARCH_HAS_KIMAGE_ARCH
struct kimage_arch {
pgd_t *pgd;
#ifdef CONFIG_X86_PAE
pmd_t *pmd0;
pmd_t *pmd1;
#endif
pte_t *pte0;
pte_t *pte1;
};
#endif
#endif /* __ASSEMBLY__ */
#endif /* _ASM_X86_KEXEC_H */