treewide: use get_random_u32() when possible

The prandom_u32() function has been a deprecated inline wrapper around
get_random_u32() for several releases now, and compiles down to the
exact same code. Replace the deprecated wrapper with a direct call to
the real function. The same also applies to get_random_int(), which is
just a wrapper around get_random_u32(). This was done as a basic find
and replace.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Yury Norov <yury.norov@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz> # for ext4
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk> # for sch_cake
Acked-by: Chuck Lever <chuck.lever@oracle.com> # for nfsd
Acked-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> # for thunderbolt
Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs
Acked-by: Helge Deller <deller@gmx.de> # for parisc
Acked-by: Heiko Carstens <hca@linux.ibm.com> # for s390
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Author: zx2c4

Documentation/networking/filter.rst

@@ -305,7 +305,7 @@ Possible BPF extensions are shown in the following table:
   vlan_tci                              skb_vlan_tag_get(skb)
   vlan_avail                            skb_vlan_tag_present(skb)
   vlan_tpid                             skb->vlan_proto
-  rand                                  prandom_u32()
+  rand                                  get_random_u32()
   ===================================   =================================================
 
 These extensions can also be prefixed with '#'.

arch/parisc/kernel/process.c

@@ -288,7 +288,7 @@ __get_wchan(struct task_struct *p)
 
 static inline unsigned long brk_rnd(void)
 {
-	return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT;
+	return (get_random_u32() & BRK_RND_MASK) << PAGE_SHIFT;
 }
 
 unsigned long arch_randomize_brk(struct mm_struct *mm)

arch/parisc/kernel/sys_parisc.c

@@ -239,14 +239,14 @@ static unsigned long mmap_rnd(void)
 	unsigned long rnd = 0;
 
 	if (current->flags & PF_RANDOMIZE)
-		rnd = get_random_int() & MMAP_RND_MASK;
+		rnd = get_random_u32() & MMAP_RND_MASK;
 
 	return rnd << PAGE_SHIFT;
 }
 
 unsigned long arch_mmap_rnd(void)
 {
-	return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT;
+	return (get_random_u32() & MMAP_RND_MASK) << PAGE_SHIFT;
 }
 
 static unsigned long mmap_legacy_base(void)

arch/s390/mm/mmap.c

@@ -37,7 +37,7 @@ static inline int mmap_is_legacy(struct rlimit *rlim_stack)
 
 unsigned long arch_mmap_rnd(void)
 {
-	return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT;
+	return (get_random_u32() & MMAP_RND_MASK) << PAGE_SHIFT;
 }
 
 static unsigned long mmap_base_legacy(unsigned long rnd)

arch/x86/kernel/cpu/amd.c

@@ -503,7 +503,7 @@ static void bsp_init_amd(struct cpuinfo_x86 *c)
 		va_align.flags    = ALIGN_VA_32 | ALIGN_VA_64;
 
 		/* A random value per boot for bit slice [12:upper_bit) */
-		va_align.bits = get_random_int() & va_align.mask;
+		va_align.bits = get_random_u32() & va_align.mask;
 	}
 
 	if (cpu_has(c, X86_FEATURE_MWAITX))

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -137,12 +137,12 @@ static u64 random_offset(u64 start, u64 end, u64 len, u64 align)
 	range = round_down(end - len, align) - round_up(start, align);
 	if (range) {
 		if (sizeof(unsigned long) == sizeof(u64)) {
-			addr = get_random_long();
+			addr = get_random_u64();
 		} else {
-			addr = get_random_int();
+			addr = get_random_u32();
 			if (range > U32_MAX) {
 				addr <<= 32;
-				addr |= get_random_int();
+				addr |= get_random_u32();
 			}
 		}
 		div64_u64_rem(addr, range, &addr);

drivers/gpu/drm/i915/selftests/i915_selftest.c

@@ -135,7 +135,7 @@ static int __run_selftests(const char *name,
 	int err = 0;
 
 	while (!i915_selftest.random_seed)
-		i915_selftest.random_seed = get_random_int();
+		i915_selftest.random_seed = get_random_u32();
 
 	i915_selftest.timeout_jiffies =
 		i915_selftest.timeout_ms ?

drivers/gpu/drm/tests/drm_buddy_test.c

@@ -729,7 +729,7 @@ static void drm_test_buddy_alloc_limit(struct kunit *test)
 static int drm_buddy_init_test(struct kunit *test)
 {
 	while (!random_seed)
-		random_seed = get_random_int();
+		random_seed = get_random_u32();
 
 	return 0;
 }

drivers/gpu/drm/tests/drm_mm_test.c

@@ -2212,7 +2212,7 @@ static void drm_test_mm_color_evict_range(struct kunit *test)
 static int drm_mm_init_test(struct kunit *test)
 {
 	while (!random_seed)
-		random_seed = get_random_int();
+		random_seed = get_random_u32();
 
 	return 0;
 }

drivers/infiniband/hw/cxgb4/cm.c

@@ -734,7 +734,7 @@ static int send_connect(struct c4iw_ep *ep)
 				   &ep->com.remote_addr;
 	int ret;
 	enum chip_type adapter_type = ep->com.dev->rdev.lldi.adapter_type;
-	u32 isn = (prandom_u32() & ~7UL) - 1;
+	u32 isn = (get_random_u32() & ~7UL) - 1;
 	struct net_device *netdev;
 	u64 params;
 
@@ -2469,7 +2469,7 @@ static int accept_cr(struct c4iw_ep *ep, struct sk_buff *skb,
 	}
 
 	if (!is_t4(adapter_type)) {
-		u32 isn = (prandom_u32() & ~7UL) - 1;
+		u32 isn = (get_random_u32() & ~7UL) - 1;
 
 		skb = get_skb(skb, roundup(sizeof(*rpl5), 16), GFP_KERNEL);
 		rpl5 = __skb_put_zero(skb, roundup(sizeof(*rpl5), 16));