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Subject[RFC] mm/memblock: Define memblock_physmem()
Date
On s390 platform memblock.physmem array is being built by directly calling
into memblock_add_range() which is a low level function not intended to be
used outside of memblock. Hence lets conditionally add helper functions for
physmem array when HAVE_MEMBLOCK_PHYS_MAP is enabled. Also use MAX_NUMNODES
instead of 0 as node ID similar to memblock_add() and memblock_reserve().
While here replace some function name strings with (%s __func__) in various
memblock_dbg() call sites.

Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Collin Walling <walling@linux.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Philipp Rudo <prudo@linux.ibm.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-s390@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
Only build tested for s390, will appreciate if some one can give it a try
on a real system.

arch/s390/kernel/setup.c | 14 ++++----------
include/linux/memblock.h | 3 +++
mm/memblock.c | 20 ++++++++++++++++----
3 files changed, 23 insertions(+), 14 deletions(-)

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 9cbf490fd162..79a7b1872e5a 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -761,14 +761,6 @@ static void __init free_mem_detect_info(void)
memblock_free(start, size);
}

-static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size)
-{
- memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n",
- start, start + size - 1);
- memblock_add_range(&memblock.memory, start, size, 0, 0);
- memblock_add_range(&memblock.physmem, start, size, 0, 0);
-}
-
static const char * __init get_mem_info_source(void)
{
switch (mem_detect.info_source) {
@@ -793,8 +785,10 @@ static void __init memblock_add_mem_detect_info(void)
get_mem_info_source(), mem_detect.info_source);
/* keep memblock lists close to the kernel */
memblock_set_bottom_up(true);
- for_each_mem_detect_block(i, &start, &end)
- memblock_physmem_add(start, end - start);
+ for_each_mem_detect_block(i, &start, &end) {
+ memblock_add(start, end - start);
+ memblock_physmem(start, end - start);
+ }
memblock_set_bottom_up(false);
memblock_dump_all();
}
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 1510b12de031..d17e7b841cb6 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -115,6 +115,9 @@ int memblock_add(phys_addr_t base, phys_addr_t size);
int memblock_remove(phys_addr_t base, phys_addr_t size);
int memblock_free(phys_addr_t base, phys_addr_t size);
int memblock_reserve(phys_addr_t base, phys_addr_t size);
+#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
+int memblock_physmem(phys_addr_t base, phys_addr_t size);
+#endif
void memblock_trim_memory(phys_addr_t align);
bool memblock_overlaps_region(struct memblock_type *type,
phys_addr_t base, phys_addr_t size);
diff --git a/mm/memblock.c b/mm/memblock.c
index 3e20c6ba2101..f6d17a1f30e3 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -694,7 +694,7 @@ int __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
{
phys_addr_t end = base + size - 1;

- memblock_dbg("memblock_add: [%pa-%pa] %pS\n",
+ memblock_dbg("%s: [%pa-%pa] %pS\n", __func__,
&base, &end, (void *)_RET_IP_);

return memblock_add_range(&memblock.memory, base, size, MAX_NUMNODES, 0);
@@ -795,7 +795,7 @@ int __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size)
{
phys_addr_t end = base + size - 1;

- memblock_dbg("memblock_remove: [%pa-%pa] %pS\n",
+ memblock_dbg("%s: [%pa-%pa] %pS\n", __func__,
&base, &end, (void *)_RET_IP_);

return memblock_remove_range(&memblock.memory, base, size);
@@ -813,7 +813,7 @@ int __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
{
phys_addr_t end = base + size - 1;

- memblock_dbg(" memblock_free: [%pa-%pa] %pS\n",
+ memblock_dbg("%s: [%pa-%pa] %pS\n", __func__,
&base, &end, (void *)_RET_IP_);

kmemleak_free_part_phys(base, size);
@@ -824,12 +824,24 @@ int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
{
phys_addr_t end = base + size - 1;

- memblock_dbg("memblock_reserve: [%pa-%pa] %pS\n",
+ memblock_dbg("%s: [%pa-%pa] %pS\n", __func__,
&base, &end, (void *)_RET_IP_);

return memblock_add_range(&memblock.reserved, base, size, MAX_NUMNODES, 0);
}

+#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
+int __init_memblock memblock_physmem(phys_addr_t base, phys_addr_t size)
+{
+ phys_addr_t end = base + size - 1;
+
+ memblock_dbg("%s: [%pa-%pa] %pS\n", __func__,
+ &base, &end, (void *)_RET_IP_);
+
+ return memblock_add_range(&memblock.physmem, base, size, MAX_NUMNODES, 0);
+}
+#endif
+
/**
* memblock_setclr_flag - set or clear flag for a memory region
* @base: base address of the region
--
2.20.1
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