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caab277b |
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02-Jun-2019 |
Thomas Gleixner <tglx@linutronix.de> |
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 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 license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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db44e9c5 |
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26-Jul-2017 |
Mark Rutland <mark.rutland@arm.com> |
arm64: Add ASM_BUG() Currently. we can only use BUG() from C code, though there are situations where we would like an equivalent mechanism in assembly code. This patch refactors our BUG() definition such that it can be used in either C or assembly, in the form of a new ASM_BUG(). The refactoring requires the removal of escape sequences, such as '\n' and '\t', but these aren't strictly necessary as we can use ';' to terminate assembler statements. The low-level assembly is factored out into <asm/asm-bug.h>, with <asm/bug.h> retained as the C wrapper. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dave Martin <dave.martin@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Will Deacon <will.deacon@arm.com>
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325cdacd |
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14-Jul-2017 |
Josh Poimboeuf <jpoimboe@redhat.com> |
debug: Fix WARN_ON_ONCE() for modules Mike Galbraith reported a situation where a WARN_ON_ONCE() call in DRM code turned into an oops. As it turns out, WARN_ON_ONCE() seems to be completely broken when called from a module. The bug was introduced with the following commit: 19d436268dde ("debug: Add _ONCE() logic to report_bug()") That commit changed WARN_ON_ONCE() to move its 'once' logic into the bug trap handler. It requires a writable bug table so that the BUGFLAG_DONE bit can be written to the flags to indicate the first warning has occurred. The bug table was made writable for vmlinux, which relies on vmlinux.lds.S and vmlinux.lds.h for laying out the sections. However, it wasn't made writable for modules, which rely on the ELF section header flags. Reported-by: Mike Galbraith <efault@gmx.de> Tested-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 19d436268dde ("debug: Add _ONCE() logic to report_bug()") Link: http://lkml.kernel.org/r/a53b04235a65478dd9afc51f5b329fdc65c84364.1500095401.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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19d43626 |
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25-Feb-2017 |
Peter Zijlstra <peterz@infradead.org> |
debug: Add _ONCE() logic to report_bug() Josh suggested moving the _ONCE logic inside the trap handler, using a bit in the bug_entry::flags field, avoiding the need for the extra variable. Sadly this only works for WARN_ON_ONCE(), since the others have printk() statements prior to triggering the trap. Still, this saves a fair amount of text and some data: text data filename 10682460 4530992 defconfig-build/vmlinux.orig 10665111 4530096 defconfig-build/vmlinux.patched Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
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f13d52cb |
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14-Mar-2017 |
Arnd Bergmann <arnd@arndb.de> |
arm64: define BUG() instruction without CONFIG_BUG This mirrors commit e9c38ceba8d9 ("ARM: 8455/1: define __BUG as asm(BUG_INSTR) without CONFIG_BUG") to make the behavior of arm64 consistent with arm and x86, and avoids lots of warnings in randconfig builds, such as: kernel/seccomp.c: In function '__seccomp_filter': kernel/seccomp.c:666:1: error: no return statement in function returning non-void [-Werror=return-type] Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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f98deee9 |
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23-Feb-2016 |
Ard Biesheuvel <ardb@kernel.org> |
arm64: move brk immediate argument definitions to separate header Instead of reversing the header dependency between asm/bug.h and asm/debug-monitors.h, split off the brk instruction immediate value defines into a new header asm/brk-imm.h, and include it from both. This solves the circular dependency issue that prevents BUG() from being used in some header files, and keeps the definitions together. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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03336b1d |
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16-Feb-2016 |
Ard Biesheuvel <ardb@kernel.org> |
arm64: prevent potential circular header dependencies in asm/bug.h Currently, using BUG_ON() in header files is cumbersome, due to the fact that asm/bug.h transitively includes a lot of other header files, resulting in the actual BUG_ON() invocation appearing before its definition in the preprocessor input. So let's reverse the #include dependency between asm/bug.h and asm/debug-monitors.h, by moving the definition of BUG_BRK_IMM from the latter to the former. Also fix up one user of asm/debug-monitors.h which relied on a transitive include. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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9fb7410f |
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24-Jul-2015 |
Dave P Martin <Dave.Martin@arm.com> |
arm64/BUG: Use BRK instruction for generic BUG traps Currently, the minimal default BUG() implementation from asm- generic is used for arm64. This patch uses the BRK software breakpoint instruction to generate a trap instead, similarly to most other arches, with the generic BUG code generating the dmesg boilerplate. This allows bug metadata to be moved to a separate table and reduces the amount of inline code at BUG and WARN sites. This also avoids clobbering any registers before they can be dumped. To mitigate the size of the bug table further, this patch makes use of the existing infrastructure for encoding addresses within the bug table as 32-bit offsets instead of absolute pointers. (Note that this limits the kernel size to 2GB.) Traps are registered at arch_initcall time for aarch64, but BUG has minimal real dependencies and it is desirable to be able to generate bug splats as early as possible. This patch redirects all debug exceptions caused by BRK directly to bug_handler() until the full debug exception support has been initialised. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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