The patch titled
Subject: lib/zlib: add zlib_deflate_dfltcc_enabled() function
has been added to the -mm tree. Its filename is
lib-zlib-add-zlib_deflate_dfltcc_enabled-function.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/lib-zlib-add-zlib_deflate_dfltcc_enabled-function.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/lib-zlib-add-zlib_deflate_dfltcc_enabled-function.patch
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------------------------------------------------------
From: Mikhail Zaslonko <zaslonko@xxxxxxxxxxxxx>
Subject: lib/zlib: add zlib_deflate_dfltcc_enabled() function
Add a new function to zlib.h checking if s390 Deflate-Conversion facility
is installed and enabled.
Link: http://lkml.kernel.org/r/20191209152948.37080-6-zaslonko@xxxxxxxxxxxxx
Signed-off-by: Mikhail Zaslonko <zaslonko@xxxxxxxxxxxxx>
Cc: Chris Mason <clm@xxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Cc: David Sterba <dsterba@xxxxxxxx>
Cc: Eduard Shishkin <edward6@xxxxxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
Cc: Josef Bacik <josef@xxxxxxxxxxxxxx>
Cc: Richard Purdie <rpurdie@xxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/zlib.h | 6 ++++++
lib/zlib_deflate/deflate.c | 6 ++++++
lib/zlib_deflate/deflate_syms.c | 1 +
lib/zlib_dfltcc/dfltcc.h | 3 +++
4 files changed, 16 insertions(+)
--- a/include/linux/zlib.h~lib-zlib-add-zlib_deflate_dfltcc_enabled-function
+++ a/include/linux/zlib.h
@@ -191,6 +191,12 @@ extern int zlib_deflate_workspacesize (i
exceed those passed here.
*/
+extern int zlib_deflate_dfltcc_enabled (void);
+/*
+ Returns 1 if Deflate-Conversion facility is installed and enabled,
+ otherwise 0.
+*/
+
/*
extern int deflateInit (z_streamp strm, int level);
--- a/lib/zlib_deflate/deflate.c~lib-zlib-add-zlib_deflate_dfltcc_enabled-function
+++ a/lib/zlib_deflate/deflate.c
@@ -59,6 +59,7 @@
#define DEFLATE_RESET_HOOK(strm) do {} while (0)
#define DEFLATE_HOOK(strm, flush, bstate) 0
#define DEFLATE_NEED_CHECKSUM(strm) 1
+#define DEFLATE_DFLTCC_ENABLED() 0
#endif
/* ===========================================================================
@@ -1138,3 +1139,8 @@ int zlib_deflate_workspacesize(int windo
+ zlib_deflate_head_memsize(memLevel)
+ zlib_deflate_overlay_memsize(memLevel);
}
+
+int zlib_deflate_dfltcc_enabled(void)
+{
+ return DEFLATE_DFLTCC_ENABLED();
+}
--- a/lib/zlib_deflate/deflate_syms.c~lib-zlib-add-zlib_deflate_dfltcc_enabled-function
+++ a/lib/zlib_deflate/deflate_syms.c
@@ -12,6 +12,7 @@
#include <linux/zlib.h>
EXPORT_SYMBOL(zlib_deflate_workspacesize);
+EXPORT_SYMBOL(zlib_deflate_dfltcc_enabled);
EXPORT_SYMBOL(zlib_deflate);
EXPORT_SYMBOL(zlib_deflateInit2);
EXPORT_SYMBOL(zlib_deflateEnd);
--- a/lib/zlib_dfltcc/dfltcc.h~lib-zlib-add-zlib_deflate_dfltcc_enabled-function
+++ a/lib/zlib_dfltcc/dfltcc.h
@@ -3,6 +3,7 @@
#define DFLTCC_H
#include "../zlib_deflate/defutil.h"
+#include "dfltcc_util.h"
/*
* Tuning parameters.
@@ -121,6 +122,8 @@ dfltcc_inflate_action dfltcc_inflate(z_s
#define DEFLATE_NEED_CHECKSUM(strm) (!dfltcc_can_deflate((strm)))
+#define DEFLATE_DFLTCC_ENABLED() is_dfltcc_enabled()
+
#define INFLATE_RESET_HOOK(strm) \
dfltcc_reset((strm), sizeof(struct inflate_state))
_
Patches currently in -mm which might be from zaslonko@xxxxxxxxxxxxx are
lib-zlib-add-s390-hardware-support-for-kernel-zlib_deflate.patch
s390-boot-rename-heap_size-due-to-name-collision.patch
lib-zlib-add-s390-hardware-support-for-kernel-zlib_inflate.patch
s390-boot-add-dfltcc=-kernel-command-line-parameter.patch
lib-zlib-add-zlib_deflate_dfltcc_enabled-function.patch
btrfs-use-larger-zlib-buffer-for-s390-hardware-compression.patch
