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SubjectRe: [PATCH v3 2/9] kexec_file: Generalize kexec_add_buffer.
On 07/01/16 at 05:31pm, Thiago Jung Bauermann wrote:
> Am Freitag, 01 Juli 2016, 17:02:23 schrieb Thiago Jung Bauermann:
> > Am Freitag, 01 Juli 2016, 14:36:02 schrieb Dave Young:
> > > On 07/01/16 at 02:51pm, Thiago Jung Bauermann wrote:
> > > > Am Donnerstag, 30 Juni 2016, 17:43:57 schrieb Dave Young:
> > > > > On 06/30/16 at 01:42pm, Thiago Jung Bauermann wrote:
> > > > > > Am Donnerstag, 30 Juni 2016, 12:49:44 schrieb Thiago Jung Bauermann:
> > > > I understand that this is all somewhat subjective, so if you still
> > > > disagree with my points I can provide a patch set implementing the
> > > > change above.
> > >
> > > I still feel it should be changed if more callbacks being introduced,
> > > though you can regard it is internal api, like above comment we do not
> > > need to assign them seperately, the member values can be assigned
> > > from the beginning.
> >
> > Ok, I'll implement the changes and submit a v4. Thanks for your review.
>
> Sorry for creating more email traffic, but it'll be better if I ask this
> before I change all other places in the code. Is the code below what you
> have in mind?

Thanks for the update, almost except a nitpick :)

>
> In particular, this version doesn't do the memset(&buf, 0, sizeof(buf))
> that the previous code I sent earlier did. Is that ok?
>
> @@ -643,13 +632,14 @@ static int __kexec_load_purgatory(struct kimage *image, unsigned long min,
> unsigned long max, int top_down)
> {
> struct purgatory_info *pi = &image->purgatory_info;
> - unsigned long align, buf_align, bss_align, buf_sz, bss_sz, bss_pad;
> - unsigned long memsz, entry, load_addr, curr_load_addr, bss_addr, offset;
> + unsigned long align, bss_align, bss_sz, bss_pad;
> + unsigned long entry, load_addr, curr_load_addr, bss_addr, offset;
> unsigned char *buf_addr, *src;
> int i, ret = 0, entry_sidx = -1;
> const Elf_Shdr *sechdrs_c;
> Elf_Shdr *sechdrs = NULL;
> - void *purgatory_buf = NULL;
> + struct kexec_buf buf = { .image = image, .buf_min = min,
> + .buf_max = max, .top_down = top_down };
>
> /*
> * sechdrs_c points to section headers in purgatory and are read
> @@ -715,9 +705,9 @@ static int __kexec_load_purgatory(struct kimage *image, unsigned long min,
> }
>
> /* Determine how much memory is needed to load relocatable object. */
> - buf_align = 1;
> + buf.buf_align = 1;
> bss_align = 1;
> - buf_sz = 0;
> + buf.bufsz = 0;
> bss_sz = 0;

Above chunk can go to the initializatioin of struct kexec buf ealier.

>
> for (i = 0; i < pi->ehdr->e_shnum; i++) {
> @@ -726,10 +716,10 @@ static int __kexec_load_purgatory(struct kimage *image, unsigned long min,
>
> align = sechdrs[i].sh_addralign;
> if (sechdrs[i].sh_type != SHT_NOBITS) {
> - if (buf_align < align)
> - buf_align = align;
> - buf_sz = ALIGN(buf_sz, align);
> - buf_sz += sechdrs[i].sh_size;
> + if (buf.buf_align < align)
> + buf.buf_align = align;
> + buf.bufsz = ALIGN(buf.bufsz, align);
> + buf.bufsz += sechdrs[i].sh_size;
> } else {
> /* bss section */
> if (bss_align < align)
> @@ -741,32 +731,31 @@ static int __kexec_load_purgatory(struct kimage *image, unsigned long min,
>
> /* Determine the bss padding required to align bss properly */
> bss_pad = 0;
> - if (buf_sz & (bss_align - 1))
> - bss_pad = bss_align - (buf_sz & (bss_align - 1));
> + if (buf.bufsz & (bss_align - 1))
> + bss_pad = bss_align - (buf.bufsz & (bss_align - 1));
>
> - memsz = buf_sz + bss_pad + bss_sz;
> + buf.memsz = buf.bufsz + bss_pad + bss_sz;
>
> /* Allocate buffer for purgatory */
> - purgatory_buf = vzalloc(buf_sz);
> - if (!purgatory_buf) {
> + buf.buffer = vzalloc(buf.bufsz);
> + if (!buf.buffer) {
> ret = -ENOMEM;
> goto out;
> }
>
> - if (buf_align < bss_align)
> - buf_align = bss_align;
> + if (buf.buf_align < bss_align)
> + buf.buf_align = bss_align;
>
> /* Add buffer to segment list */
> - ret = kexec_add_buffer(image, purgatory_buf, buf_sz, memsz,
> - buf_align, min, max, top_down,
> - &pi->purgatory_load_addr);
> + ret = kexec_add_buffer(&buf);
> if (ret)
> goto out;
> + pi->purgatory_load_addr = buf.mem;
>
> /* Load SHF_ALLOC sections */
> - buf_addr = purgatory_buf;
> + buf_addr = buf.buffer;
> load_addr = curr_load_addr = pi->purgatory_load_addr;
> - bss_addr = load_addr + buf_sz + bss_pad;
> + bss_addr = load_addr + buf.bufsz + bss_pad;
>
> for (i = 0; i < pi->ehdr->e_shnum; i++) {
> if (!(sechdrs[i].sh_flags & SHF_ALLOC))
> @@ -812,11 +801,11 @@ static int __kexec_load_purgatory(struct kimage *image, unsigned long min,
> * Used later to identify which section is purgatory and skip it
> * from checksumming.
> */
> - pi->purgatory_buf = purgatory_buf;
> + pi->purgatory_buf = buf.buffer;
> return ret;
> out:
> vfree(sechdrs);
> - vfree(purgatory_buf);
> + vfree(buf.buffer);
> return ret;
> }
>
>
> []'s
> Thiago Jung Bauermann
> IBM Linux Technology Center
>

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