fallthrough fixes for Clang for 5.10-rc2

Hi Linus,
 
 Please, pull the following patch that fixes almost 40,000 fall-through
 warnings when building Linux 5.10-rc1 with Clang 12.0.0 and this[1]
 change reverted. Notice that in order to enable -Wimplicit-fallthrough
 for Clang, such change[1] is meant to be reverted at some point. So,
 this patch helps to move in that direction.
 
 - include: jhash/signal: Fix fall-through warnings for Clang
 
 [1] commit e2079e93f5 ("kbuild: Do not enable -Wimplicit-fallthrough for clang for now")
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCAAdFiEEkmRahXBSurMIg1YvRwW0y0cG2zEFAl+bCvUACgkQRwW0y0cG
 2zE10A//W6Q9Ay7e0FaXfBtRbh9rILMRWSJ+TNVBadVhKj4FIXyAwTMpkjxJinD1
 USbG0JZjYbj0Seba8Avvh7RElOf5aFJ5gGtE7jY2PCxzOYI2N+4aaQng6U8W7QpZ
 Zs9lWe1RMYXUSP+YKLaGDjfSUDVbV2kHKR1/SFeCHeV7tllTMupYBdHBrtEAI90k
 YxhUSpsptT3EcAmXBWMy19zViOLlIMqdVzLSU3oTu/ymXvj+bsWor0tALD5mx614
 qxPXk5HvCygDzl9+N7syJkk5yx116ECT5M623bBkA3RrZOhr+HQi6kpHyWMVj0aF
 ZZJeV9k/x2OSpH2fnBQm5QoxxTXoWJrYx0iF7DWwzMktXsgNcnVGJcG1C4aiEn0d
 iM7KAMGvrsU1+l3op9IGfYDYYi1lVEiko+qou78c4o1Oir2oFPKtLsHnySW4KvSj
 3FPnerfRCydVeqoCx3QKMmi9G1Lt6Tzl4XY6Y9teEGFfj2EX+MiUFQBeSIk4BMDx
 CdvkuZfaVasp0ROh86IwF1gBmQ6tAJxTsAFEAfemaHDZeuJxJ6Tpawm1GCl7XF7Q
 ZjYFSY7Nr/Yq7ILE6zGvMNUxxfREU2EoRjQre5xDsMbapATExlr2ZBGApOZhDuB3
 MIP9d6SbfWSTrFpcPE5yRmsOEbZb4XMoY4XMrh5MfdEly1ix7Q4=
 =RZ7h
 -----END PGP SIGNATURE-----

Merge tag 'fallthrough-fixes-clang-5.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux

Pull fallthrough fix from Gustavo A. R. Silva:
 "This fixes a ton of fall-through warnings when building with Clang
  12.0.0 and -Wimplicit-fallthrough"

* tag 'fallthrough-fixes-clang-5.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux:
  include: jhash/signal: Fix fall-through warnings for Clang

include/linux/jhash.h

@@ -99,6 +99,7 @@ static inline u32 jhash(const void *key, u32 length, u32 initval)
 	case 2:  a += (u32)k[1]<<8;	fallthrough;
 	case 1:  a += k[0];
 		 __jhash_final(a, b, c);
+		 break;
 	case 0: /* Nothing left to add */
 		break;
 	}
@@ -136,6 +137,7 @@ static inline u32 jhash2(const u32 *k, u32 length, u32 initval)
 	case 2: b += k[1];	fallthrough;
 	case 1: a += k[0];
 		__jhash_final(a, b, c);
+		break;
 	case 0:	/* Nothing left to add */
 		break;
 	}

include/linux/signal.h

@@ -238,6 +238,7 @@ static inline void siginitset(sigset_t *set, unsigned long mask)
 		memset(&set->sig[1], 0, sizeof(long)*(_NSIG_WORDS-1));
 		break;
 	case 2: set->sig[1] = 0;
+		break;
 	case 1: ;
 	}
 }
@@ -250,6 +251,7 @@ static inline void siginitsetinv(sigset_t *set, unsigned long mask)
 		memset(&set->sig[1], -1, sizeof(long)*(_NSIG_WORDS-1));
 		break;
 	case 2: set->sig[1] = -1;
+		break;
 	case 1: ;
 	}
 }