Fix a warning on Linux

ANNOUNCE.md

@@ -1,11 +1,12 @@
-# Announcing C-Blosc2 2.15.0
+# Announcing C-Blosc2 2.15.1
 A fast, compressed and persistent binary data store library for C.
 
 ## What is new?
 
-This is a minor release in which a new io mode
-was added to memory-map files. Furthermore, the `io_cb` read API was changed, so the 
-`SOVERSION` was bumped. In addition, the internal zstd sources were updated to 1.5.6 and some
+This is a maintenance release in which we are fixing calling instructions
+more advanced than available in current CPU, causing a SIGKILL.
+Furthermore, a new `b2nd_nans` function has been added. In addition,
+the internal LZ4 sources were updated to 1.10.0 and some
 other improvements were made.
 
 For more info, please see the release notes in:

RELEASE_NOTES.md

@@ -4,8 +4,18 @@ Release notes for C-Blosc2
 Changes from 2.15.0 to 2.15.1
 =============================
 
+* Do not pass `-m` flags when compiling `shuffle.c`. This prevents the
+  compiler from incidentally optimizing the code called independently
+  of the runtime CPU check to these instruction sets, effectively
+  causing `SIGILL` on other CPUs.  Fixes #621.  Thanks to @t20100 and @mgorny.
+
 * Internal LZ4 sources bumped to 1.10.0.
 
+* Allow direct loading of plugins by name, without relying on
+  the presence of python. Thanks to @boxerab.
+
+* Add `b2nd_nans` method (PR #624). Thanks to @waynegm.
+
 
 Changes from 2.14.4 to 2.15.0
 =============================

blosc/blosc2-stdio.c

@@ -255,7 +255,7 @@ void *blosc2_stdio_mmap_open(const char *urlpath, const char *mode, void* params
       _print_last_error();
       BLOSC_TRACE_ERROR("Cannot close the handle to the memory-mapped file.");
     }
-    
+
     return NULL;
   }
 #else
@@ -353,7 +353,7 @@ int64_t blosc2_stdio_mmap_write(const void *ptr, int64_t size, int64_t nitems, i
         _print_last_error();
         BLOSC_TRACE_ERROR("Cannot close the handle to the memory-mapped file.");
       }
-      
+
       return 0;
     }
 
@@ -373,12 +373,12 @@ int64_t blosc2_stdio_mmap_write(const void *ptr, int64_t size, int64_t nitems, i
   }
 
   if (mmap_file->mapping_size < mmap_file->file_size) {
-    int64_t old_mapping_size = mmap_file->mapping_size;
     mmap_file->mapping_size = mmap_file->file_size * 2;
 
 #if defined(__linux__)
     /* mremap is the best option as it also ensures that the old data is still available in c mode. Unfortunately, it
     is no POSIX standard and only available on Linux */
+    int64_t old_mapping_size = mmap_file->mapping_size;
     char* new_address = mremap(mmap_file->addr, old_mapping_size, mmap_file->mapping_size, MREMAP_MAYMOVE);
 #else
     if (mmap_file->is_memory_only) {