[PATCH 6/6] nvram: Shrink our zlib_deflate workspace from 268K to 24K

[Jim Keniston]

Exploit zlib_deflate_workspacesize2() to create a much smaller
zlib_deflate workspace when capturing oops/panic reports to NVRAM.

Signed-off-by: Jim Keniston <jkeni...@us.ibm.com>
---

 arch/powerpc/platforms/pseries/nvram.c |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/nvram.c 
b/arch/powerpc/platforms/pseries/nvram.c
index 8e5ed74..6409cb6 100644
--- a/arch/powerpc/platforms/pseries/nvram.c
+++ b/arch/powerpc/platforms/pseries/nvram.c
@@ -17,7 +17,6 @@
 #include <linux/init.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>
-#include <linux/vmalloc.h>
 #include <linux/ctype.h>
 #include <linux/kmsg_dump.h>
 #include <linux/zlib.h>
@@ -94,6 +93,8 @@ static struct oops_parition_data {
 } *little_oops_buf;
 
 #define COMPR_LEVEL 6
+#define WINDOW_BITS 12
+#define MEM_LEVEL 4
 static struct z_stream_s stream;
 
 static ssize_t pSeries_nvram_read(char *buf, size_t count, loff_t *index)
@@ -408,7 +409,8 @@ static void __init nvram_init_oops_partition(int 
rtas_partition_exists)
        big_oops_buf_sz = (little_oops_buf_sz * 100) / 45;
        big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
        if (big_oops_buf) {
-               stream.workspace = vmalloc(zlib_deflate_workspacesize());
+               stream.workspace = kmalloc(zlib_deflate_workspacesize2(
+                               WINDOW_BITS, MEM_LEVEL), GFP_KERNEL);
                if (!stream.workspace) {
                        pr_err("nvram: No memory for compression workspace; "
                                "skipping compression of %s partition data\n",
@@ -427,7 +429,7 @@ static void __init nvram_init_oops_partition(int 
rtas_partition_exists)
                pr_err("nvram: kmsg_dump_register() failed; returned %d\n", rc);
                kfree(little_oops_buf);
                kfree(big_oops_buf);
-               vfree(stream.workspace);
+               kfree(stream.workspace);
        }
 }
 
@@ -625,7 +627,8 @@ static int nvram_compress(const void *in, void *out, size_t 
inlen,
        int err, ret;
 
        ret = -EIO;
-       err = zlib_deflateInit(&stream, COMPR_LEVEL);
+       err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS,
+                                               MEM_LEVEL, Z_DEFAULT_STRATEGY);
        if (err != Z_OK)
                goto error;
 

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