forked from Minki/linux
kexec: add machine_kexec_post_load()
It is the same as machine_kexec_prepare(), but is called after segments are loaded. This way, can do processing work with already loaded relocation segments. One such example is arm64: it has to have segments loaded in order to create a page table, but it cannot do it during kexec time, because at that time allocations won't be possible anymore. Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com> Acked-by: Dave Young <dyoung@redhat.com> Signed-off-by: Will Deacon <will@kernel.org>
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@ -159,6 +159,10 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments,
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kimage_terminate(image);
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ret = machine_kexec_post_load(image);
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if (ret)
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goto out;
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/* Install the new kernel and uninstall the old */
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image = xchg(dest_image, image);
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@ -589,6 +589,12 @@ static void kimage_free_extra_pages(struct kimage *image)
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kimage_free_page_list(&image->unusable_pages);
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}
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int __weak machine_kexec_post_load(struct kimage *image)
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{
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return 0;
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}
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void kimage_terminate(struct kimage *image)
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{
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if (*image->entry != 0)
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@ -441,6 +441,10 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
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kimage_terminate(image);
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ret = machine_kexec_post_load(image);
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if (ret)
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goto out;
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/*
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* Free up any temporary buffers allocated which are not needed
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* after image has been loaded
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@ -13,6 +13,8 @@ void kimage_terminate(struct kimage *image);
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int kimage_is_destination_range(struct kimage *image,
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unsigned long start, unsigned long end);
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int machine_kexec_post_load(struct kimage *image);
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extern struct mutex kexec_mutex;
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#ifdef CONFIG_KEXEC_FILE
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