linux/lib/cmdline.c, branch v5.11

Merge tag 'fallthrough-fixes-clang-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux

2020-12-16T08:24:16Z

Pull fallthrough fixes from Gustavo A. R. Silva: "Fix many fall-through warnings when building with Clang 12.0.0 using -Wimplicit-fallthrough. - powerpc: boot: include compiler_attributes.h (Nick Desaulniers) - Revert "lib: Revert use of fallthrough pseudo-keyword in lib/" (Nick Desaulniers) - powerpc: fix -Wimplicit-fallthrough (Nick Desaulniers) - lib: Fix fall-through warnings for Clang (Gustavo A. R. Silva)" * tag 'fallthrough-fixes-clang-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux: lib: Fix fall-through warnings for Clang powerpc: fix -Wimplicit-fallthrough Revert "lib: Revert use of fallthrough pseudo-keyword in lib/" powerpc: boot: include compiler_attributes.h

lib/cmdline: allow NULL to be an output for get_option()

2020-12-16T06:46:16Z

In the future we would like to use get_option() to only validate the string and parse it separately. To achieve this, allow NULL to be an output for get_option(). Link: https://lkml.kernel.org/r/20201112180732.75589-5-andriy.shevchenko@linux.intel.com Signed-off-by: Andy Shevchenko Cc: Brendan Higgins Cc: David Gow Cc: Mark Brown Cc: Matti Vaittinen Cc: Shuah Khan Cc: Vitor Massaru Iha Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

lib/cmdline: fix get_option() for strings starting with hyphen

2020-12-16T06:46:16Z

When string doesn't have an integer and starts from hyphen get_option() may return interesting results. Fix it to return 0. The simple_strtoull() is used due to absence of simple_strtoul() in a boot code on some architectures. Note, the Fixes tag below is rather for anthropological curiosity. Link: https://lkml.kernel.org/r/20201112180732.75589-4-andriy.shevchenko@linux.intel.com Fixes: f68565831e72 ("Import 2.4.0-test2pre3") Signed-off-by: Andy Shevchenko Cc: Brendan Higgins Cc: David Gow Cc: Mark Brown Cc: Matti Vaittinen Cc: Shuah Khan Cc: Vitor Massaru Iha Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

lib: Fix fall-through warnings for Clang

2020-11-19T13:23:47Z

In preparation to enable -Wimplicit-fallthrough for Clang, fix multiple warnings by explicitly adding multiple break statements instead of letting the code fall through to the next case, and by replacing a number of /* fall through */ comments with the new pseudo-keyword macro fallthrough. Notice that Clang doesn't recognize /* Fall through */ comments as implicit fall-through markings. Link: https://github.com/KSPP/linux/issues/115 Signed-off-by: Gustavo A. R. Silva

Revert "lib: Revert use of fallthrough pseudo-keyword in lib/"

2020-11-18T20:15:17Z

This reverts commit 6a9dc5fd6170 ("lib: Revert use of fallthrough pseudo-keyword in lib/") Now that we can build arch/powerpc/boot/ free of -Wimplicit-fallthrough, re-enable these fixes for lib/. Signed-off-by: Nick Desaulniers Tested-by: Nathan Chancellor Reviewed-by: Nathan Chancellor Reviewed-by: Gustavo A. R. Silva Reviewed-by: Miguel Ojeda Link: https://github.com/ClangBuiltLinux/linux/issues/236 Signed-off-by: Gustavo A. R. Silva

lib: Revert use of fallthrough pseudo-keyword in lib/

2020-08-24T21:17:44Z

The following build error for powerpc64 was reported by Nathan Chancellor: "$ scripts/config --file arch/powerpc/configs/powernv_defconfig -e KERNEL_XZ $ make -skj"$(nproc)" ARCH=powerpc CROSS_COMPILE=powerpc64le-linux- distclean powernv_defconfig zImage ... In file included from arch/powerpc/boot/../../../lib/decompress_unxz.c:234, from arch/powerpc/boot/decompress.c:38: arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c: In function 'dec_main': arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c:586:4: error: 'fallthrough' undeclared (first use in this function) 586 | fallthrough; | ^~~~~~~~~~~ This will end up affecting distribution configurations such as Debian and OpenSUSE according to my testing. I am not sure what the solution is, the PowerPC wrapper does not set -D__KERNEL__ so I am not sure that compiler_attributes.h can be safely included." In order to avoid these sort of problems, it seems that the best solution is to use /* fall through */ comments instead of the fallthrough pseudo-keyword macro in lib/, for now. Reported-by: Nathan Chancellor Fixes: df561f6688fe ("treewide: Use fallthrough pseudo-keyword") Signed-off-by: Gustavo A. R. Silva Reviewed-and-tested-by: Nathan Chancellor Signed-off-by: Linus Torvalds

treewide: Use fallthrough pseudo-keyword

2020-08-23T22:36:59Z

Replace the existing /* 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. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230

2019-06-19T15:09:06Z

Based on 2 normalized pattern(s): this source code is licensed under the gnu general public license version 2 see the file copying for more details this source code is licensed under general public license version 2 see extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 52 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Enrico Weigelt Reviewed-by: Allison Randal Reviewed-by: Alexios Zavras Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.449021192@linutronix.de Signed-off-by: Greg Kroah-Hartman

lib/cmdline.c: mark expected switch fall-throughs

2019-04-08T23:39:23Z

In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through. This patch fixes the following warnings: lib/cmdline.c:137:7: warning: this statement may fall through [-Wimplicit-fallthrough=] lib/cmdline.c:140:7: warning: this statement may fall through [-Wimplicit-fallthrough=] lib/cmdline.c:143:7: warning: this statement may fall through [-Wimplicit-fallthrough=] lib/cmdline.c:146:7: warning: this statement may fall through [-Wimplicit-fallthrough=] lib/cmdline.c:149:7: warning: this statement may fall through [-Wimplicit-fallthrough=] Warning level 3 was used: -Wimplicit-fallthrough=3 This patch is part of the ongoing efforts to enabling -Wimplicit-fallthrough. Acked-by: Kees Cook Signed-off-by: Gustavo A. R. Silva

lib/cmdline.c: remove meaningless comment

2017-09-09T01:26:49Z

One line of code was commented out by c++ style comment for debugging, but forgot removing it. Clean it up. Link: http://lkml.kernel.org/r/1503312113-11843-1-git-send-email-bhe@redhat.com Signed-off-by: Baoquan He Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds