Revision 618a568d exec.c

b/exec.c
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    if (mem_path) {
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#if defined (__linux__) && !defined(TARGET_S390X)
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        new_block->host = file_ram_alloc(size, mem_path);
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        if (!new_block->host)
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            exit(1);
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        if (!new_block->host) {
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            new_block->host = qemu_vmalloc(size);
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#ifdef MADV_MERGEABLE
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            madvise(new_block->host, size, MADV_MERGEABLE);
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#endif
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        }
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#else
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        fprintf(stderr, "-mem-path option unsupported\n");
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        exit(1);

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