git: 90ac116d5e46 - stable/14 - nehemiah RNG: Switch to using FPU_KERN_NOCTX

The branch stable/14 has been updated by jhb:

URL: https://cgit.FreeBSD.org/src/commit/?id=90ac116d5e466e631fc5b8ee8e9fd16bd10c8f07

commit 90ac116d5e466e631fc5b8ee8e9fd16bd10c8f07
Author:     John Baldwin <jhb@FreeBSD.org>
AuthorDate: 2023-08-25 19:34:16 +0000
Commit:     John Baldwin <jhb@FreeBSD.org>
CommitDate: 2023-12-29 21:49:41 +0000

    nehemiah RNG: Switch to using FPU_KERN_NOCTX
    
    Reviewed by:    kib
    Differential Revision:  https://reviews.freebsd.org/D41583
    
    (cherry picked from commit 7aec088cbce8381bd5bf730419b8fdcddf43b08d)
---
 sys/dev/random/nehemiah.c | 24 ++----------------------
 1 file changed, 2 insertions(+), 22 deletions(-)

diff --git a/sys/dev/random/nehemiah.c b/sys/dev/random/nehemiah.c
index 09c8c32c6d39..e01fdb952108 100644
--- a/sys/dev/random/nehemiah.c
+++ b/sys/dev/random/nehemiah.c
@@ -43,8 +43,6 @@
 
 #include <dev/random/randomdev.h>
 
-static void random_nehemiah_init(void);
-static void random_nehemiah_deinit(void);
 static u_int random_nehemiah_read(void *, u_int);
 
 static struct random_source random_nehemiah = {
@@ -53,8 +51,6 @@ static struct random_source random_nehemiah = {
 	.rs_read = random_nehemiah_read
 };
 
-static struct fpu_kern_ctx *fpu_ctx_save;
-
 /* This H/W source never stores more than 8 bytes in one go */
 /* ARGSUSED */
 static __inline size_t
@@ -75,20 +71,6 @@ VIA_RNG_store(void *buf)
 	return (0);
 }
 
-static void
-random_nehemiah_init(void)
-{
-
-	fpu_ctx_save = fpu_kern_alloc_ctx(FPU_KERN_NORMAL);
-}
-
-static void
-random_nehemiah_deinit(void)
-{
-
-	fpu_kern_free_ctx(fpu_ctx_save);
-}
-
 /* It is specifically allowed that buf is a multiple of sizeof(long) */
 static u_int
 random_nehemiah_read(void *buf, u_int c)
@@ -97,14 +79,14 @@ random_nehemiah_read(void *buf, u_int c)
 	size_t count, ret;
 	uint64_t tmp;
 
-	fpu_kern_enter(curthread, fpu_ctx_save, FPU_KERN_NORMAL);
+	fpu_kern_enter(curthread, NULL, FPU_KERN_NORMAL | FPU_KERN_NOCTX);
 	b = buf;
 	for (count = c; count > 0; count -= ret) {
 		ret = MIN(VIA_RNG_store(&tmp), count);
 		memcpy(b, &tmp, ret);
 		b += ret;
 	}
-	fpu_kern_leave(curthread, fpu_ctx_save);
+	fpu_kern_leave(curthread, NULL);
 
 	return (c);
 }
@@ -119,13 +101,11 @@ nehemiah_modevent(module_t mod, int type, void *unused)
 		if (via_feature_rng & VIA_HAS_RNG) {
 			random_source_register(&random_nehemiah);
 			printf("random: fast provider: \"%s\"\n", random_nehemiah.rs_ident);
-			random_nehemiah_init();
 		}
 		break;
 
 	case MOD_UNLOAD:
 		if (via_feature_rng & VIA_HAS_RNG) {
-			random_nehemiah_deinit();
 			random_source_deregister(&random_nehemiah);
 		}
 		break;