module/*.ko: prune .data, global .rodata

Evaluated every variable that lives in .data (and globals in .rodata)
in the kernel modules, and constified/eliminated/localised them
appropriately. This means that all read-only data is now actually
read-only data, and, if possible, at file scope. A lot of previously-
global-symbols became inlinable (and inlined!) constants. Probably
not in a big Wowee Performance Moment, but hey.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12899

module/icp/algs/modes/gcm.c

@@ -779,7 +779,7 @@ static gcm_impl_ops_t gcm_fastest_impl = {
 };
 
 /* All compiled in implementations */
-const gcm_impl_ops_t *gcm_all_impl[] = {
+static const gcm_impl_ops_t *gcm_all_impl[] = {
 	&gcm_generic_impl,
 #if defined(__x86_64) && defined(HAVE_PCLMULQDQ)
 	&gcm_pclmulqdq_impl,
@@ -1046,9 +1046,6 @@ MODULE_PARM_DESC(icp_gcm_impl, "Select gcm implementation.");
 #define	GCM_AVX_MAX_CHUNK_SIZE \
 	(((128*1024)/GCM_AVX_MIN_DECRYPT_BYTES) * GCM_AVX_MIN_DECRYPT_BYTES)
 
-/* Get the chunk size module parameter. */
-#define	GCM_CHUNK_SIZE_READ *(volatile uint32_t *) &gcm_avx_chunk_size
-
 /* Clear the FPU registers since they hold sensitive internal state. */
 #define	clear_fpu_regs() clear_fpu_regs_avx()
 #define	GHASH_AVX(ctx, in, len) \
@@ -1057,6 +1054,9 @@ MODULE_PARM_DESC(icp_gcm_impl, "Select gcm implementation.");
 
 #define	gcm_incr_counter_block(ctx) gcm_incr_counter_block_by(ctx, 1)
 
+/* Get the chunk size module parameter. */
+#define	GCM_CHUNK_SIZE_READ *(volatile uint32_t *) &gcm_avx_chunk_size
+
 /*
  * Module parameter: number of bytes to process at once while owning the FPU.
  * Rounded down to the next GCM_AVX_MIN_DECRYPT_BYTES byte boundary and is