linux-kernel - [PATCH 20/21] memblock: memblock_alloc_try

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Message-Id: <1547646261-32535-21-git-send-email-rppt@linux.ibm.com>
Date:   Wed, 16 Jan 2019 15:44:20 +0200
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@....de>,
        "David S. Miller" <davem@...emloft.net>,
        Dennis Zhou <dennis@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greentime Hu <green.hu@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guan Xuetao <gxt@....edu.cn>, Guo Ren <guoren@...nel.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Mark Salter <msalter@...hat.com>,
        Matt Turner <mattst88@...il.com>,
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Subject: [PATCH 20/21] memblock: memblock_alloc_try_nid: don't panic

As all the memblock_alloc*() users are now checking the return value and
panic() in case of error, the panic() call can be removed from the core
memblock allocator, namely memblock_alloc_try_nid().

Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
---
 mm/memblock.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/mm/memblock.c b/mm/memblock.c
index 03b3929..7164275 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1526,7 +1526,7 @@ void * __init memblock_alloc_try_nid_nopanic(
 }
 
 /**
- * memblock_alloc_try_nid - allocate boot memory block with panicking
+ * memblock_alloc_try_nid - allocate boot memory block
  * @size: size of memory block to be allocated in bytes
  * @align: alignment of the region and block's size
  * @min_addr: the lower bound of the memory region from where the allocation
@@ -1536,9 +1536,8 @@ void * __init memblock_alloc_try_nid_nopanic(
  *	      allocate only from memory limited by memblock.current_limit value
  * @nid: nid of the free area to find, %NUMA_NO_NODE for any node
  *
- * Public panicking version of memblock_alloc_try_nid_nopanic()
- * which provides debug information (including caller info), if enabled,
- * and panics if the request can not be satisfied.
+ * Public function, provides additional debug information (including caller
+ * info), if enabled. This function zeroes the allocated memory.
  *
  * Return:
  * Virtual address of allocated memory block on success, NULL on failure.
@@ -1555,14 +1554,10 @@ void * __init memblock_alloc_try_nid(
 		     &max_addr, (void *)_RET_IP_);
 	ptr = memblock_alloc_internal(size, align,
 					   min_addr, max_addr, nid);
-	if (ptr) {
+	if (ptr)
 		memset(ptr, 0, size);
-		return ptr;
-	}
 
-	panic("%s: Failed to allocate %llu bytes align=0x%llx nid=%d from=%pa max_addr=%pa\n",
-	      __func__, (u64)size, (u64)align, nid, &min_addr, &max_addr);
-	return NULL;
+	return ptr;
 }
 
 /**
-- 
2.7.4