Re: [PATCH RESEND v1 5/5] crash: option to let arch decide mem range is usable

[Sourabh Jain]

On 08/01/25 17:08, Baoquan he wrote:
> On 01/08/25 at 03:44pm, Sourabh Jain wrote:
> ...snip...
> > diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> > index f0e9f8eda7a3..407f8b0346aa 100644
> > --- a/include/linux/kexec.h
> > +++ b/include/linux/kexec.h
> > @@ -205,6 +205,15 @@ static inline int arch_kimage_file_post_load_cleanup(struct kimage *image)
> >   }
> >   #endif
> >   
> > +#ifndef arch_check_excluded_range
> > +static inline int arch_check_excluded_range(struct kimage *image,
> > +					    unsigned long start,
> > +					    unsigned long end)
> > +{
> > +	return 0;
> > +}
> > +#endif
> > +
> >   #ifdef CONFIG_KEXEC_SIG
> >   #ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
> >   int kexec_kernel_verify_pe_sig(const char *kernel, unsigned long kernel_len);
> > diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> > index 3eedb8c226ad..52e1480dbfa1 100644
> > --- a/kernel/kexec_file.c
> > +++ b/kernel/kexec_file.c
> > @@ -464,6 +464,12 @@ static int locate_mem_hole_top_down(unsigned long start, unsigned long end,
> >   			continue;
> >   		}
> >   
> > +		/* Make sure this does not conflict exclude range */
>                                                     ^
>                  Make sure this doesn't conflict with excluded range?
>
> > +		if (arch_check_excluded_range(image, temp_start, temp_end)) {
> > +			temp_start = temp_start - PAGE_SIZE;
> > +			continue;
> > +		}
> > +
> >   		/* We found a suitable memory range */
> >   		break;
> >   	} while (1);
> > @@ -498,6 +504,12 @@ static int locate_mem_hole_bottom_up(unsigned long start, unsigned long end,
> >   			continue;
> >   		}
> >   
> > +		/* Make sure this does not conflict exclude range */
>                                                     ^
>                                                   Ditto.

I will update both comments.

Thanks,
Sourabh Jain