Re: [PATCH v7 3/5] crash: Use crash_exclude_core_ranges() on powerpc
From: Sourabh Jain
Date: Sat Feb 28 2026 - 08:12:39 EST
On 28/02/26 06:51, Jinjie Ruan wrote:
On 2026/2/27 22:50, Sourabh Jain wrote:
Resend of:It seems the declaration of crash_exclude_mem_range_guarded() added in
https://lore.kernel.org/all/19cf18b5-362d-4ff2-8b85-e2e72809250c@xxxxxxxxxxxxx/
On 26/02/26 18:34, Jinjie Ruan wrote:
The crash memory exclude of crashk_res and crashk_cma memory on powerpc
are almost identical to the generic crash_exclude_core_ranges().
By introducing the architecture-specific arch_crash_exclude_mem_range()
function with a default implementation of crash_exclude_mem_range(),
and using crash_exclude_mem_range_guarded as powerpc's separate
implementation, the generic crash_exclude_core_ranges() helper function
can be reused.
Acked-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
---
arch/powerpc/kexec/ranges.c | 16 ++++------------
include/linux/crash_core.h | 4 ++++
kernel/crash_core.c | 19 +++++++++++++------
3 files changed, 21 insertions(+), 18 deletions(-)
diff --git a/arch/powerpc/kexec/ranges.c b/arch/powerpc/kexec/ranges.c
index 6c58bcc3e130..e5fea23b191b 100644
--- a/arch/powerpc/kexec/ranges.c
+++ b/arch/powerpc/kexec/ranges.c
@@ -553,9 +553,9 @@ int get_usable_memory_ranges(struct crash_mem
**mem_ranges)
#endif /* CONFIG_KEXEC_FILE */
#ifdef CONFIG_CRASH_DUMP
-int crash_exclude_mem_range_guarded(struct crash_mem **mem_ranges,
- unsigned long long mstart,
- unsigned long long mend)
+int arch_crash_exclude_mem_range(struct crash_mem **mem_ranges,
+ unsigned long long mstart,
+ unsigned long long mend)
update_crash_elfcorehdr() in arch/powerpc/kexec/crash.c still calls
crash_exclude_mem_range_guarded(), causing a build failure.
ld: arch/powerpc/kexec/crash.o: in function `update_crash_elfcorehdr':
/root/linux/arch/powerpc/kexec/crash.c:454: undefined reference to
`crash_exclude_mem_range_guarded'
To fix this:
--------------
diff --git a/arch/powerpc/kexec/crash.c b/arch/powerpc/kexec/crash.c
index 898742a5205c..e59e909c369d 100644
--- a/arch/powerpc/kexec/crash.c
+++ b/arch/powerpc/kexec/crash.c
@@ -451,7 +451,7 @@ static void update_crash_elfcorehdr(struct kimage
*image, struct memory_notify *
base_addr = PFN_PHYS(mn->start_pfn);
size = mn->nr_pages * PAGE_SIZE;
end = base_addr + size - 1;
- ret = crash_exclude_mem_range_guarded(&cmem, base_addr,
end);
+ ret = arch_crash_exclude_mem_range(&cmem, base_addr, end);
if (ret) {
pr_err("Failed to remove hot-unplugged memory
from crash memory ranges\n");
goto out;
With the above change included, things are working fine on powerpc.
arch/powerpc/include/asm/kexec_ranges.h can also be removed.
Yes, lets remove it.
{
struct crash_mem *tmem = *mem_ranges;
@@ -604,18 +604,10 @@ int get_crash_memory_ranges(struct crash_mem
**mem_ranges)
sort_memory_ranges(*mem_ranges, true);
}
- /* Exclude crashkernel region */
- ret = crash_exclude_mem_range_guarded(mem_ranges,
crashk_res.start, crashk_res.end);
+ ret = crash_exclude_core_ranges(mem_ranges);
if (ret)
goto out;
- for (i = 0; i < crashk_cma_cnt; ++i) {
- ret = crash_exclude_mem_range_guarded(mem_ranges,
crashk_cma_ranges[i].start,
- crashk_cma_ranges[i].end);
- if (ret)
- goto out;
- }
-
/*
* FIXME: For now, stay in parity with kexec-tools but if RTAS/OPAL
* regions are exported to save their context at the time of
diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
index 033b20204aca..dbec826dc53b 100644
--- a/include/linux/crash_core.h
+++ b/include/linux/crash_core.h
@@ -68,6 +68,7 @@ extern int crash_prepare_elf64_headers(struct
crash_mem *mem, int need_kernel_ma
void **addr, unsigned long *sz);
extern int crash_prepare_headers(int need_kernel_map, void **addr,
unsigned long *sz, unsigned long *nr_mem_ranges);
+extern int crash_exclude_core_ranges(struct crash_mem **cmem);
struct kimage;
struct kexec_segment;
@@ -88,6 +89,9 @@ extern int kimage_crash_copy_vmcoreinfo(struct
kimage *image);
extern unsigned int arch_get_system_nr_ranges(void);
extern int arch_crash_populate_cmem(struct crash_mem *cmem);
extern int arch_crash_exclude_ranges(struct crash_mem *cmem);
+extern int arch_crash_exclude_mem_range(struct crash_mem **mem,
+ unsigned long long mstart,
+ unsigned long long mend);
#else /* !CONFIG_CRASH_DUMP*/
struct pt_regs;
diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index 96a96e511f5a..300d44ad5471 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -287,24 +287,31 @@ unsigned int __weak
arch_get_system_nr_ranges(void) { return 0; }
int __weak arch_crash_populate_cmem(struct crash_mem *cmem) { return
-1; }
int __weak arch_crash_exclude_ranges(struct crash_mem *cmem) {
return 0; }
-static int crash_exclude_core_ranges(struct crash_mem *cmem)
+int __weak arch_crash_exclude_mem_range(struct crash_mem **mem,
+ unsigned long long mstart,
+ unsigned long long mend)
+{
+ return crash_exclude_mem_range(*mem, mstart, mend);
+}
+
+int crash_exclude_core_ranges(struct crash_mem **cmem)
{
int ret, i;
/* Exclude crashkernel region */
- ret = crash_exclude_mem_range(cmem, crashk_res.start,
crashk_res.end);
+ ret = arch_crash_exclude_mem_range(cmem, crashk_res.start,
crashk_res.end);
if (ret)
return ret;
if (crashk_low_res.end) {
- ret = crash_exclude_mem_range(cmem, crashk_low_res.start,
crashk_low_res.end);
+ ret = arch_crash_exclude_mem_range(cmem,
crashk_low_res.start, crashk_low_res.end);
if (ret)
return ret;
}
for (i = 0; i < crashk_cma_cnt; ++i) {
- ret = crash_exclude_mem_range(cmem, crashk_cma_ranges[i].start,
- crashk_cma_ranges[i].end);
+ ret = arch_crash_exclude_mem_range(cmem,
crashk_cma_ranges[i].start,
+ crashk_cma_ranges[i].end);
if (ret)
return ret;
}
@@ -331,7 +338,7 @@ int crash_prepare_headers(int need_kernel_map,
void **addr, unsigned long *sz,
if (ret)
goto out;
- ret = crash_exclude_core_ranges(cmem);
+ ret = crash_exclude_core_ranges(&cmem);
if (ret)
goto out;