Merge tag 'fallthrough-pseudo-keyword-5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux

Pull 'fallthrough' keyword conversion from Gustavo A. R. Silva:
 "A tree-wide patch that replaces tons (2484) of /* fall through */
  comments, and its variants, with the new pseudo-keyword macro
  fallthrough[1]. Also, remove unnecessary fall-through markings when it
  is the case.

  There are currently 1167 intances of this fallthrough pseudo-keyword
  macro in mainline (5.9-rc2), that have been introduced over the last
  couple of development cycles:

    $ git grep -nw 'fallthrough;' | wc -l
    1167

  The global adoption of the fallthrough pseudo-keyword is something
  certain to happen; so, better sooner than later. :) This will also
  save everybody's time and thousands of lines of unnecessarily
  repetitive changelog text.

  After applying this patch on top of 5.9-rc2, we'll have a total of
  3651 instances of this macro:

    $ git grep -nw 'fallthrough;' | wc -l
    3651

  This treewide patch doesn't address ALL fall-through markings in all
  subsystems at once because I have previously sent out patches for some
  of such subsystems separately, and I will follow up on them; however,
  this definitely contributes most of the work needed to replace all the
  fall-through markings with the fallthrough pseudo-keyword macro in the
  whole codebase.

  I have build-tested this patch on 10 different architectures: x86_64,
  i386, arm64, powerpc, s390, sparc64, sh, m68k, powerpc64 and alpha
  (allyesconfig for all of them). This is in linux-next already and
  kernel test robot has also helped me to successfully build-test early
  versions of this patch[2][3][4][5]"

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through
[2] https://lore.kernel.org/lkml/5f3cc99a.HgvOW3rH0mD0RmkM%[email protected]/
[3] https://lore.kernel.org/lkml/5f3dd1d2.l1axczH+t4hMBZ63%[email protected]/
[4] https://lore.kernel.org/lkml/5f3e977a.mwYHUIObbR4SHr0B%[email protected]/
[5] https://lore.kernel.org/lkml/5f3f9e1c.qsyb%2FaySkiXNpkO4%[email protected]/

* tag 'fallthrough-pseudo-keyword-5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux:
  treewide: Use fallthrough pseudo-keyword

1 files changed, 5 insertions, 6 deletions

diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index 43875c289723..a52c7abf2ca4 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -437,7 +437,6 @@ void parisc_terminate(char *msg, struct pt_regs *regs, int code, unsigned long o
 		break;
 
 	default:
-		/* Fall through */
 		break;
 
 	}
@@ -644,12 +643,12 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
 
 	case 15:
 		/* Data TLB miss fault/Data page fault */
-		/* Fall through */
+		fallthrough;
 	case 16:
 		/* Non-access instruction TLB miss fault */
 		/* The instruction TLB entry needed for the target address of the FIC
 		   is absent, and hardware can't find it, so we get to cleanup */
-		/* Fall through */
+		fallthrough;
 	case 17:
 		/* Non-access data TLB miss fault/Non-access data page fault */
 		/* FIXME: 
@@ -673,7 +672,7 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
 			handle_unaligned(regs);
 			return;
 		}
-		/* Fall Through */
+		fallthrough;
 	case 26: 
 		/* PCXL: Data memory access rights trap */
 		fault_address = regs->ior;
@@ -683,7 +682,7 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
 	case 19:
 		/* Data memory break trap */
 		regs->gr[0] |= PSW_X; /* So we can single-step over the trap */
-		/* fall thru */
+		fallthrough;
 	case 21:
 		/* Page reference trap */
 		handle_gdb_break(regs, TRAP_HWBKPT);
@@ -730,7 +729,7 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
 			}
 			mmap_read_unlock(current->mm);
 		}
-		/* Fall Through */
+		fallthrough;
 	case 27: 
 		/* Data memory protection ID trap */
 		if (code == 27 && !user_mode(regs) &&