Re: mm/slab: ppc: ubi: kmalloc_slab WARNING / PPC + UBI driver

[Christoph Lameter <cl@gentwo.org>]

Crap you cannot do PAGE_SIZE allocations with kmalloc_large. Fails when
freeing pages. Need to only do the multiple page allocs with
kmalloc_large.

Subject: seq_file: Use kmalloc_large for page sized allocation

There is no point in using the slab allocation functions for
large page order allocation. Use kmalloc_large().

This fixes the warning about large allocs but it will still cause
large contiguous allocs that could fail because of memory fragmentation.

Signed-off-by: Christoph Lameter <cl@linux.com>

Index: linux/fs/seq_file.c
===================================================================
--- linux.orig/fs/seq_file.c	2013-07-31 10:39:03.050472030 -0500
+++ linux/fs/seq_file.c	2013-07-31 10:39:03.050472030 -0500
@@ -136,7 +136,7 @@ static int traverse(struct seq_file *m,
 Eoverflow:
 	m->op->stop(m, p);
 	kfree(m->buf);
-	m->buf = kmalloc(m->size <<= 1, GFP_KERNEL);
+	m->buf = kmalloc_large(m->size <<= 1, GFP_KERNEL);
 	return !m->buf ? -ENOMEM : -EAGAIN;
 }

@@ -232,7 +232,7 @@ ssize_t seq_read(struct file *file, char
 			goto Fill;
 		m->op->stop(m, p);
 		kfree(m->buf);
-		m->buf = kmalloc(m->size <<= 1, GFP_KERNEL);
+		m->buf = kmalloc_large(m->size <<= 1, GFP_KERNEL);
 		if (!m->buf)
 			goto Enomem;
 		m->count = 0;

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