The patch titled
Subject: lib/zlib: drop EQUAL macro
has been added to the -mm mm-nonmm-unstable branch. Its filename is
lib-zlib-drop-equal-macro.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/lib-zlib-drop-equal-macro.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Yury Norov <yury.norov@xxxxxxxxx>
Subject: lib/zlib: drop EQUAL macro
Date: Wed, 5 Feb 2025 16:29:32 -0500
The macro is prehistoric, and only exists to help those readers who don't
know what memcmp() returns if memory areas differ. This is pretty well
documented, so the macro looks excessive.
Now that the only user of the macro depends on DEBUG_ZLIB config, GCC
warns about unused macro if the library is built with W=2 against
defconfig. So drop it for good.
Link: https://lkml.kernel.org/r/20250205212933.68695-1-yury.norov@xxxxxxxxx
Signed-off-by: Yury Norov <yury.norov@xxxxxxxxx>
Cc: Heiko Carsten <heiko.carstens@xxxxxxxxxx>
Cc: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
Cc: Mikhail Zaslonko <zaslonko@xxxxxxxxxxxxx>
Cc: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/zlib_deflate/deflate.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
--- a/lib/zlib_deflate/deflate.c~lib-zlib-drop-equal-macro
+++ a/lib/zlib_deflate/deflate.c
@@ -151,9 +151,6 @@ static const config configuration_table[
* meaning.
*/
-#define EQUAL 0
-/* result of memcmp for equal strings */
-
/* ===========================================================================
* Update a hash value with the given input byte
* IN assertion: all calls to UPDATE_HASH are made with consecutive
@@ -713,8 +710,7 @@ static void check_match(
)
{
/* check that the match is indeed a match */
- if (memcmp((char *)s->window + match,
- (char *)s->window + start, length) != EQUAL) {
+ if (memcmp((char *)s->window + match, (char *)s->window + start, length)) {
fprintf(stderr, " start %u, match %u, length %d\n",
start, match, length);
do {
_
Patches currently in -mm which might be from yury.norov@xxxxxxxxx are
lib-zlib-drop-equal-macro.patch
