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authorMikhail Zaslonko <zaslonko@linux.ibm.com>2023-01-26 16:14:27 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-02-03 09:50:09 +0300
commit9010dbc007b853ed55905e40fa8e9d39fcb75935 (patch)
tree618c4739ebd575009f5fb34cbcb34ce2cd3776c1 /lib
parent9fec9f8ea51c782d58a8b86f8e868fc06c782386 (diff)
downloadlinux-9010dbc007b853ed55905e40fa8e9d39fcb75935.tar.xz
lib/zlib: DFLTCC support inflate with small window
There is no hardware control for DFLTCC window size. After this change, software and hardware window formats no longer match: the software will use wbits and wsize, and the hardware will use HB_BITS and HB_SIZE. Since neither dictionary manipulation nor internal allocation functions are relevant to kernel zlib and zlib_inflate_workspacesize() always use MAX_WBITS for window size calculation, only dfltcc_can_inflate() and dfltcc_inflate() functions are affected by this patch. This commit is based on: https://github.com/zlib-ng/zlib-ng/commit/3eab317 Link: https://lkml.kernel.org/r/20230126131428.1222214-8-zaslonko@linux.ibm.com Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Acked-by: Ilya Leoshkevich <iii@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/zlib_dfltcc/dfltcc_inflate.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/lib/zlib_dfltcc/dfltcc_inflate.c b/lib/zlib_dfltcc/dfltcc_inflate.c
index a16f416c8811..5786030c6dc2 100644
--- a/lib/zlib_dfltcc/dfltcc_inflate.c
+++ b/lib/zlib_dfltcc/dfltcc_inflate.c
@@ -22,10 +22,6 @@ int dfltcc_can_inflate(
zlib_dfltcc_support == ZLIB_DFLTCC_DEFLATE_ONLY)
return 0;
- /* Unsupported compression settings */
- if (state->wbits != HB_BITS)
- return 0;
-
/* Unsupported hardware */
return is_bit_set(dfltcc_state->af.fns, DFLTCC_XPND) &&
is_bit_set(dfltcc_state->af.fmts, DFLTCC_FMT0);
@@ -129,8 +125,6 @@ dfltcc_inflate_action dfltcc_inflate(
/* Translate stream to parameter block */
param->cvt = CVT_ADLER32;
param->sbb = state->bits;
- param->hl = state->whave; /* Software and hardware history formats match */
- param->ho = (state->write - state->whave) & ((1 << HB_BITS) - 1);
if (param->hl)
param->nt = 0; /* Honor history for the first block */
param->cv = state->check;
@@ -144,8 +138,6 @@ dfltcc_inflate_action dfltcc_inflate(
strm->msg = oesc_msg(dfltcc_state->msg, param->oesc);
state->last = cc == DFLTCC_CC_OK;
state->bits = param->sbb;
- state->whave = param->hl;
- state->write = (param->ho + param->hl) & ((1 << HB_BITS) - 1);
state->check = param->cv;
if (cc == DFLTCC_CC_OP2_CORRUPT && param->oesc != 0) {
/* Report an error if stream is corrupted */