Hi Ard,
On Fri, 2021-01-15 at 09:30 -0800, Lakshmi Ramasubramanian wrote:
> create_dtb() function allocates kernel virtual memory for
> the device tree blob (DTB). This is not consistent with other
> architectures, such as powerpc, which calls kmalloc() for allocating
> memory for the DTB.
>
> Call kmalloc() to allocate memory for the DTB, and kfree() to free
> the allocated memory.
The vmalloc() function description says, "vmalloc - allocate virtually
contiguous memory". I'd appreciate your reviewing this patch, in
particular, which replaces vmalloc() with kmalloc().
thanks,
Mimi
>
> Co-developed-by: Prakhar Srivastava <prsriva@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Prakhar Srivastava <prsriva@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx>
> ---
> arch/arm64/kernel/machine_kexec_file.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
> index 7de9c47dee7c..51c40143d6fa 100644
> --- a/arch/arm64/kernel/machine_kexec_file.c
> +++ b/arch/arm64/kernel/machine_kexec_file.c
> @@ -29,7 +29,7 @@ const struct kexec_file_ops * const kexec_file_loaders[] = {
>
> int arch_kimage_file_post_load_cleanup(struct kimage *image)
> {
> - vfree(image->arch.dtb);
> + kfree(image->arch.dtb);
> image->arch.dtb = NULL;
>
> vfree(image->arch.elf_headers);
> @@ -59,19 +59,21 @@ static int create_dtb(struct kimage *image,
> + cmdline_len + DTB_EXTRA_SPACE;
>
> for (;;) {
> - buf = vmalloc(buf_size);
> + buf = kmalloc(buf_size, GFP_KERNEL);
> if (!buf)
> return -ENOMEM;
>
> /* duplicate a device tree blob */
> ret = fdt_open_into(initial_boot_params, buf, buf_size);
> - if (ret)
> + if (ret) {
> + kfree(buf);
> return -EINVAL;
> + }
>
> ret = of_kexec_setup_new_fdt(image, buf, initrd_load_addr,
> initrd_len, cmdline);
> if (ret) {
> - vfree(buf);
> + kfree(buf);
> if (ret == -ENOMEM) {
> /* unlikely, but just in case */
> buf_size += DTB_EXTRA_SPACE;
> @@ -217,6 +219,6 @@ int load_other_segments(struct kimage *image,
> return 0;
>
> out_err:
> - vfree(dtb);
> + kfree(dtb);
> return ret;
> }
