pstore: Adjust buffer size for compression for smaller registered buffers

[karo-tx-linux.git] / fs / pstore / platform.c

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 4ffb7ab5e397ecfcaede608a39c5025cb4ecd858..57b4219398cdf8e0661a63d567c04034b28c575b 100644 (file)
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -195,8 +195,29 @@ error:
 static void allocate_buf_for_compression(void)
 {
        size_t size;
+       size_t cmpr;
+
+       switch (psinfo->bufsize) {
+       /* buffer range for efivars */
+       case 1000 ... 2000:
+               cmpr = 56;
+               break;
+       case 2001 ... 3000:
+               cmpr = 54;
+               break;
+       case 3001 ... 3999:
+               cmpr = 52;
+               break;
+       /* buffer range for nvram, erst */
+       case 4000 ... 10000:
+               cmpr = 45;
+               break;
+       default:
+               cmpr = 60;
+               break;
+       }
 
-       big_oops_buf_sz = (psinfo->bufsize * 100) / 45;
+       big_oops_buf_sz = (psinfo->bufsize * 100) / cmpr;
        big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
        if (big_oops_buf) {
                size = max(zlib_deflate_workspacesize(WINDOW_BITS, MEM_LEVEL),