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Date:   Fri,  3 Jan 2020 14:11:06 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-mm@...ck.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Collin Walling <walling@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Philipp Rudo <prudo@...ux.ibm.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC] mm/memblock: Define memblock_physmem()

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@...ibm.com>
Cc: Vasily Gorbik <gor@...ux.ibm.com>
Cc: Christian Borntraeger <borntraeger@...ibm.com>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Collin Walling <walling@...ux.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@...ibm.com>
Cc: Philipp Rudo <prudo@...ux.ibm.com>
Cc: Mike Rapoport <rppt@...ux.ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-s390@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....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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