resource: add walk_system_ram_res_rev()

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This function, being a variant of walk_system_ram_res() introduced in
commit 8c86e70ace ("resource: provide new functions to walk through
resources"), walks through a list of all the resources of System RAM in
reversed order, i.e., from higher to lower.

It will be used in kexec_file code to load kernel, initrd etc when
preparing kexec reboot.

Link: https://lkml.kernel.org/r/ZVTA6z/06cLnWKUz@MiWiFi-R3L-srv
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

This commit is contained in:

Baoquan He 2023-11-15 21:00:27 +08:00 • committed by Andrew Morton

parent bfc4372b86

commit 7acf164b25

2 changed files with 60 additions and 0 deletions

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3

include/linux/ioport.h

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57

kernel/resource.c

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