The patch titled
Subject: kernel/kexec_file.c: add walk_system_ram_res_rev()
has been added to the -mm tree. Its filename is
resource-add-walk_system_ram_res_rev.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/resource-add-walk_system_ram_res_rev.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/resource-add-walk_system_ram_res_rev.patch
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------------------------------------------------------
From: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
Subject: kernel/kexec_file.c: add walk_system_ram_res_rev()
This function, being a variant of walk_system_ram_res() introduced in
commit 8c86e70acead ("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.
Link: http://lkml.kernel.org/r/20180322033722.9279-2-bhe@xxxxxxxxxx
Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Philipp Rudo <prudo@xxxxxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/ioport.h | 3 +
kernel/resource.c | 63 +++++++++++++++++++++++++++++++++++++++
2 files changed, 66 insertions(+)
diff -puN include/linux/ioport.h~resource-add-walk_system_ram_res_rev include/linux/ioport.h
--- a/include/linux/ioport.h~resource-add-walk_system_ram_res_rev
+++ a/include/linux/ioport.h
@@ -277,6 +277,9 @@ extern int
walk_system_ram_res(u64 start, u64 end, void *arg,
int (*func)(struct resource *, void *));
extern int
+walk_system_ram_res_rev(u64 start, u64 end, void *arg,
+ int (*func)(struct resource *, void *));
+extern int
walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end,
void *arg, int (*func)(struct resource *, void *));
diff -puN kernel/resource.c~resource-add-walk_system_ram_res_rev kernel/resource.c
--- a/kernel/resource.c~resource-add-walk_system_ram_res_rev
+++ a/kernel/resource.c
@@ -23,6 +23,8 @@
#include <linux/pfn.h>
#include <linux/mm.h>
#include <linux/resource_ext.h>
+#include <linux/string.h>
+#include <linux/vmalloc.h>
#include <asm/io.h>
@@ -470,6 +472,67 @@ int walk_system_ram_res(u64 start, u64 e
}
/*
+ * This function, being a variant of walk_system_ram_res(), calls the @func
+ * callback against all memory ranges of type System RAM which are marked as
+ * IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY in reversed order, i.e., from
+ * higher to lower.
+ */
+int walk_system_ram_res_rev(u64 start, u64 end, void *arg,
+ int (*func)(struct resource *, void *))
+{
+ struct resource res, *rams;
+ int rams_size = 16, i;
+ int ret = -1;
+
+ /* create a list */
+ rams = vmalloc(sizeof(struct resource) * rams_size);
+ if (!rams)
+ return ret;
+
+ res.start = start;
+ res.end = end;
+ res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+ i = 0;
+ while ((res.start < res.end) &&
+ (!find_next_iomem_res(&res, IORES_DESC_NONE, true))) {
+ if (i >= rams_size) {
+ /* re-alloc */
+ struct resource *rams_new;
+ int rams_new_size;
+
+ rams_new_size = rams_size + 16;
+ rams_new = vmalloc(sizeof(struct resource)
+ * rams_new_size);
+ if (!rams_new)
+ goto out;
+
+ memcpy(rams_new, rams,
+ sizeof(struct resource) * rams_size);
+ vfree(rams);
+ rams = rams_new;
+ rams_size = rams_new_size;
+ }
+
+ rams[i].start = res.start;
+ rams[i++].end = res.end;
+
+ res.start = res.end + 1;
+ res.end = end;
+ }
+
+ /* go reverse */
+ for (i--; i >= 0; i--) {
+ ret = (*func)(&rams[i], arg);
+ if (ret)
+ break;
+ }
+
+out:
+ vfree(rams);
+ return ret;
+}
+
+/*
* This function calls the @func callback against all memory ranges, which
* are ranges marked as IORESOURCE_MEM and IORESOUCE_BUSY.
*/
_
Patches currently in -mm which might be from takahiro.akashi@xxxxxxxxxx are
kexec_file-make-an-use-of-purgatory-optional.patch
kexec_file-make-an-use-of-purgatory-optional-fix.patch
kexec_filex86powerpc-factor-out-kexec_file_ops-functions.patch
x86-kexec_file-purge-system-ram-walking-from-prepare_elf64_headers.patch
x86-kexec_file-remove-x86_64-dependency-from-prepare_elf64_headers.patch
x86-kexec_file-lift-crash_max_ranges-limit-on-crash_mem-buffer.patch
x86-kexec_file-clean-up-prepare_elf64_headers.patch
kexec_file-x86-move-re-factored-code-to-generic-side.patch
resource-add-walk_system_ram_res_rev.patch
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