Thread (21 messages) 21 messages, 5 authors, 2018-12-06

Re: [PATCH v2 3/6] sh: prefer memblock APIs returning virtual address

From: Sam Ravnborg <hidden>
Date: 2018-12-03 16:11:12
Also in: linux-arm-kernel, linux-mm, linuxppc-dev, lkml, sparclinux

Hi Mike.

On Mon, Dec 03, 2018 at 05:47:12PM +0200, Mike Rapoport wrote:
quoted hunk ↗ jump to hunk
Rather than use the memblock_alloc_base that returns a physical address and
then convert this address to the virtual one, use appropriate memblock
function that returns a virtual address.

There is a small functional change in the allocation of then NODE_DATA().
Instead of panicing if the local allocation failed, the non-local
allocation attempt will be made.

Signed-off-by: Mike Rapoport <redacted>
---
 arch/sh/mm/init.c | 18 +++++-------------
 arch/sh/mm/numa.c |  5 ++---
 2 files changed, 7 insertions(+), 16 deletions(-)
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index c8c13c77..3576b5f 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -192,24 +192,16 @@ void __init page_table_range_init(unsigned long start, unsigned long end,
 void __init allocate_pgdat(unsigned int nid)
 {
 	unsigned long start_pfn, end_pfn;
-#ifdef CONFIG_NEED_MULTIPLE_NODES
-	unsigned long phys;
-#endif
 
 	get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
 
 #ifdef CONFIG_NEED_MULTIPLE_NODES
-	phys = __memblock_alloc_base(sizeof(struct pglist_data),
-				SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
-	/* Retry with all of system memory */
-	if (!phys)
-		phys = __memblock_alloc_base(sizeof(struct pglist_data),
-					SMP_CACHE_BYTES, memblock_end_of_DRAM());
-	if (!phys)
+	NODE_DATA(nid) = memblock_alloc_try_nid_nopanic(
+				sizeof(struct pglist_data),
+				SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT,
+				MEMBLOCK_ALLOC_ACCESSIBLE, nid);
+	if (!NODE_DATA(nid))
 		panic("Can't allocate pgdat for node %d\n", nid);
-
-	NODE_DATA(nid) = __va(phys);
-	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
The new code will always assign NODE_DATA(nid), where the old
code only assigned NODE_DATA(nid) in the good case.
I dunno if this is an issue, just noticed the difference and
wanted to point it out.

	Sam
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help