+ memblock-stop-poisoning-raw-allocations.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: memblock: stop poisoning raw allocations
has been added to the -mm tree.  Its filename is
     memblock-stop-poisoning-raw-allocations.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/memblock-stop-poisoning-raw-allocations.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/memblock-stop-poisoning-raw-allocations.patch

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------------------------------------------------------
From: Mike Rapoport <rppt@linux.ibm.com>
Subject: memblock: stop poisoning raw allocations

Functions memblock_alloc_exact_nid_raw() and memblock_alloc_try_nid_raw()
are intended for early memory allocation without overhead of zeroing the
allocated memory.  Since these functions were used to allocate the memory
map, they have ended up with addition of a call to page_init_poison() that
poisoned the allocated memory when CONFIG_PAGE_POISON was set.

Since the memory map is allocated using a dedicated memmep_alloc()
function that takes care of the poisoning, remove page poisoning from the
memblock_alloc_*_raw() functions.

Link: https://lkml.kernel.org/r/20210714123739.16493-5-rppt@kernel.org
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: Michal Simek <monstr@monstr.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memblock.c |   20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

--- a/mm/memblock.c~memblock-stop-poisoning-raw-allocations
+++ a/mm/memblock.c
@@ -1490,18 +1490,12 @@ void * __init memblock_alloc_exact_nid_r
 			phys_addr_t min_addr, phys_addr_t max_addr,
 			int nid)
 {
-	void *ptr;
-
 	memblock_dbg("%s: %llu bytes align=0x%llx nid=%d from=%pa max_addr=%pa %pS\n",
 		     __func__, (u64)size, (u64)align, nid, &min_addr,
 		     &max_addr, (void *)_RET_IP_);
 
-	ptr = memblock_alloc_internal(size, align,
-					   min_addr, max_addr, nid, true);
-	if (ptr && size > 0)
-		page_init_poison(ptr, size);
-
-	return ptr;
+	return memblock_alloc_internal(size, align, min_addr, max_addr, nid,
+				       true);
 }
 
 /**
@@ -1528,18 +1522,12 @@ void * __init memblock_alloc_try_nid_raw
 			phys_addr_t min_addr, phys_addr_t max_addr,
 			int nid)
 {
-	void *ptr;
-
 	memblock_dbg("%s: %llu bytes align=0x%llx nid=%d from=%pa max_addr=%pa %pS\n",
 		     __func__, (u64)size, (u64)align, nid, &min_addr,
 		     &max_addr, (void *)_RET_IP_);
 
-	ptr = memblock_alloc_internal(size, align,
-					   min_addr, max_addr, nid, false);
-	if (ptr && size > 0)
-		page_init_poison(ptr, size);
-
-	return ptr;
+	return memblock_alloc_internal(size, align, min_addr, max_addr, nid,
+				       false);
 }
 
 /**
_

Patches currently in -mm which might be from rppt@linux.ibm.com are

mm-page_alloc-always-initialize-memory-map-for-the-holes.patch
microblaze-simplify-pte_alloc_one_kernel.patch
mm-introduce-memmap_alloc-to-unify-memory-map-allocation.patch
memblock-stop-poisoning-raw-allocations.patch
mm-remove-pfn_valid_within-and-config_holes_in_zone.patch
mm-memory_hotplug-cleanup-after-removal-of-pfn_valid_within.patch