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tools: KVM: selftests: Convert clear/set_bit() to actual atomics Convert {clear,set}_bit() to atomics as KVM's ucall implementation relies on clear_bit() being atomic, they are defined in atomic.h, and the same helpers in the kernel proper are atomic. KVM's ucall infrastructure is the only user of clear_bit() in tools/, and there are no true set_bit() users. tools/testing/nvdimm/ does make heavy use of set_bit(), but that code builds into a kernel module of sorts, i.e. pulls in all of the kernel's header and so is already getting the kernel's atomic set_bit(). Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20221119013450.2643007-10-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> | 3 年前 | |
tools: KVM: selftests: Convert clear/set_bit() to actual atomics Convert {clear,set}_bit() to atomics as KVM's ucall implementation relies on clear_bit() being atomic, they are defined in atomic.h, and the same helpers in the kernel proper are atomic. KVM's ucall infrastructure is the only user of clear_bit() in tools/, and there are no true set_bit() users. tools/testing/nvdimm/ does make heavy use of set_bit(), but that code builds into a kernel module of sorts, i.e. pulls in all of the kernel's header and so is already getting the kernel's atomic set_bit(). Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20221119013450.2643007-10-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> | 3 年前 | |
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public licence as published by the free software foundation either version 2 of the licence or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 114 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520170857.552531963@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 7 年前 | |
tools: sync tools/bitmap with mother linux Remove tools/include/asm-generic/bitops/find.h and copy include/linux/bitmap.h to tools. find_*_le() functions are not copied because not needed in tools. Signed-off-by: Yury Norov <yury.norov@gmail.com> Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com> | 4 年前 | |
tools: sync small_const_nbits() macro with the kernel Sync implementation with the kernel and move the macro from tools/include/linux/bitmap.h to tools/include/asm-generic/bitsperlong.h Link: https://lkml.kernel.org/r/20210401003153.97325-7-yury.norov@gmail.com Signed-off-by: Yury Norov <yury.norov@gmail.com> Acked-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Alexey Klimov <aklimov@redhat.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: David Sterba <dsterba@suse.com> Cc: Dennis Zhou <dennis@kernel.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Jianpeng Ma <jianpeng.ma@intel.com> Cc: Joe Perches <joe@perches.com> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Rich Felker <dalias@libc.org> Cc: Stefano Brivio <sbrivio@redhat.com> Cc: Wei Yang <richard.weiyang@linux.alibaba.com> Cc: Wolfram Sang <wsa+renesas@sang-engineering.com> Cc: Yoshinori Sato <ysato@users.osdn.me> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> | 5 年前 | |
hugetlb_encode.h: fix undefined behaviour (34 << 26) Left-shifting past the size of your datatype is undefined behaviour in C. The literal 34 gets the type int, and that one is not big enough to be left shifted by 26 bits. An unsigned is long enough (on any machine that has at least 32 bits for their ints.) For uniformity, we mark all the literals as unsigned. But it's only really needed for HUGETLB_FLAG_ENCODE_16GB. Thanks to Randy Dunlap for an initial review and suggestion. Link: https://lkml.kernel.org/r/20220905031904.150925-1-matthias.goergens@gmail.com Signed-off-by: Matthias Goergens <matthias.goergens@gmail.com> Acked-by: Randy Dunlap <rdunlap@infradead.org> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Muchun Song <songmuchun@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> | 3 年前 | |
x86/insn: Use get_unaligned() instead of memcpy() Use get_unaligned() instead of memcpy() to access potentially unaligned memory, which, when accessed through a pointer, leads to undefined behavior. get_unaligned() describes much better what is happening there anyway even if memcpy() does the job. In addition, since perf tool builds with -Werror, it would fire with: util/intel-pt-decoder/../../../arch/x86/lib/insn.c: In function '__insn_get_emulate_prefix': tools/include/../include/asm-generic/unaligned.h:10:15: error: packed attribute is unnecessary [-Werror=packed] 10 | const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \ because -Werror=packed would complain if the packed attribute would have no effect on the layout of the structure. In this case, that is intentional so disable the warning only for that compilation unit. That part is Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> No functional changes. Fixes: 5ba1071f7554 ("x86/insn, tools/x86: Fix undefined behavior due to potential unaligned accesses") Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Tested-by: Stephen Rothwell <sfr@canb.auug.org.au> Link: https://lkml.kernel.org/r/YVSsIkj9Z29TyUjE@zn.tnic | 4 年前 |
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