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| author | Zhen Lei <thunder.leizhen@huawei.com> | 2023-05-27 20:34:38 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-06-09 17:44:24 -0700 |
| commit | 5b7bfb32cbaad6ba997ab4295ee50bc9921252f2 (patch) | |
| tree | 43f4485e0b26c5ccfabe4afe0cd3161dbfa30fd4 /kernel/kexec_core.c | |
| parent | 8a7db7790a3ff8413bedef886cf135ba301e88d7 (diff) | |
| download | linux-5b7bfb32cbaad6ba997ab4295ee50bc9921252f2.tar.gz linux-5b7bfb32cbaad6ba997ab4295ee50bc9921252f2.tar.bz2 linux-5b7bfb32cbaad6ba997ab4295ee50bc9921252f2.zip | |
kexec: add helper __crash_shrink_memory()
No functional change, in preparation for the next patch so that it is
easier to review.
[akpm@linux-foundation.org: make __crash_shrink_memory() static]
Link: https://lore.kernel.org/oe-kbuild-all/202305280717.Pw06aLkz-lkp@intel.com/
Link: https://lkml.kernel.org/r/20230527123439.772-6-thunder.leizhen@huawei.com
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Cong Wang <amwang@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'kernel/kexec_core.c')
| -rw-r--r-- | kernel/kexec_core.c | 51 |
1 files changed, 29 insertions, 22 deletions
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index 69fe92141b0b..f7ff7de94a61 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -1105,11 +1105,38 @@ ssize_t crash_get_memory_size(void) return size; } +static int __crash_shrink_memory(struct resource *old_res, + unsigned long new_size) +{ + struct resource *ram_res; + + ram_res = kzalloc(sizeof(*ram_res), GFP_KERNEL); + if (!ram_res) + return -ENOMEM; + + ram_res->start = old_res->start + new_size; + ram_res->end = old_res->end; + ram_res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; + ram_res->name = "System RAM"; + + if (!new_size) { + release_resource(old_res); + old_res->start = 0; + old_res->end = 0; + } else { + crashk_res.end = ram_res->start - 1; + } + + crash_free_reserved_phys_range(ram_res->start, ram_res->end); + insert_resource(&iomem_resource, ram_res); + + return 0; +} + int crash_shrink_memory(unsigned long new_size) { int ret = 0; unsigned long old_size; - struct resource *ram_res; if (!kexec_trylock()) return -EBUSY; @@ -1125,27 +1152,7 @@ int crash_shrink_memory(unsigned long new_size) goto unlock; } - ram_res = kzalloc(sizeof(*ram_res), GFP_KERNEL); - if (!ram_res) { - ret = -ENOMEM; - goto unlock; - } - - ram_res->start = crashk_res.start + new_size; - ram_res->end = crashk_res.end; - ram_res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; - ram_res->name = "System RAM"; - - if (!new_size) { - release_resource(&crashk_res); - crashk_res.start = 0; - crashk_res.end = 0; - } else { - crashk_res.end = ram_res->start - 1; - } - - crash_free_reserved_phys_range(ram_res->start, ram_res->end); - insert_resource(&iomem_resource, ram_res); + ret = __crash_shrink_memory(&crashk_res, new_size); unlock: kexec_unlock(); |