From: Philipp Rudo <prudo@xxxxxxxxxxxxxxxxxx> Subject: kernel/kexec_file.c: remove unneeded variables in kexec_purgatory_setup_sechdrs The main loop currently uses quite a lot of variables to update the section headers. Some of them are unnecessary. So clean them up a little. Link: http://lkml.kernel.org/r/20180321112751.22196-9-prudo@xxxxxxxxxxxxxxxxxx Signed-off-by: Philipp Rudo <prudo@xxxxxxxxxxxxxxxxxx> Acked-by: Dave Young <dyoung@xxxxxxxxxx> Cc: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx> Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx> Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxxxxxxx> Cc: Vivek Goyal <vgoyal@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- kernel/kexec_file.c | 34 ++++++++++++---------------------- 1 file changed, 12 insertions(+), 22 deletions(-) diff -puN kernel/kexec_file.c~kexec_file-remove-unneeded-variables-in-kexec_purgatory_setup_sechdrs kernel/kexec_file.c --- a/kernel/kexec_file.c~kexec_file-remove-unneeded-variables-in-kexec_purgatory_setup_sechdrs +++ a/kernel/kexec_file.c @@ -785,12 +785,8 @@ out: static int kexec_purgatory_setup_sechdrs(struct purgatory_info *pi, struct kexec_buf *kbuf) { - unsigned long curr_load_addr; - unsigned long load_addr; unsigned long bss_addr; unsigned long offset; - unsigned char *buf_addr; - unsigned char *src; Elf_Shdr *sechdrs; int i; @@ -823,20 +819,18 @@ static int kexec_purgatory_setup_sechdrs sechdrs[i].sh_offset; } - /* Load SHF_ALLOC sections */ - buf_addr = kbuf->buffer; - load_addr = curr_load_addr = kbuf->mem; - bss_addr = load_addr + kbuf->bufsz; + offset = 0; + bss_addr = kbuf->mem + kbuf->bufsz; kbuf->image->start = pi->ehdr->e_entry; for (i = 0; i < pi->ehdr->e_shnum; i++) { unsigned long align; + void *src, *dst; if (!(sechdrs[i].sh_flags & SHF_ALLOC)) continue; align = sechdrs[i].sh_addralign; - if (sechdrs[i].sh_type == SHT_NOBITS) { bss_addr = ALIGN(bss_addr, align); sechdrs[i].sh_addr = bss_addr; @@ -844,31 +838,27 @@ static int kexec_purgatory_setup_sechdrs continue; } - curr_load_addr = ALIGN(curr_load_addr, align); - offset = curr_load_addr - load_addr; - /* We already modifed ->sh_offset to keep src addr */ - src = (char *)sechdrs[i].sh_offset; - memcpy(buf_addr + offset, src, sechdrs[i].sh_size); - + offset = ALIGN(offset, align); if (sechdrs[i].sh_flags & SHF_EXECINSTR && pi->ehdr->e_entry >= sechdrs[i].sh_addr && pi->ehdr->e_entry < (sechdrs[i].sh_addr + sechdrs[i].sh_size)) { kbuf->image->start -= sechdrs[i].sh_addr; - kbuf->image->start += curr_load_addr; + kbuf->image->start += kbuf->mem + offset; } - /* Store load address and source address of section */ - sechdrs[i].sh_addr = curr_load_addr; + src = (void *)sechdrs[i].sh_offset; + dst = pi->purgatory_buf + offset; + memcpy(dst, src, sechdrs[i].sh_size); + + sechdrs[i].sh_addr = kbuf->mem + offset; /* * This section got copied to temporary buffer. Update * ->sh_offset accordingly. */ - sechdrs[i].sh_offset = (unsigned long)(buf_addr + offset); - - /* Advance to the next address */ - curr_load_addr += sechdrs[i].sh_size; + sechdrs[i].sh_offset = (unsigned long)dst; + offset += sechdrs[i].sh_size; } return 0; _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
