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| author | Peter Zijlstra <peterz@infradead.org> | 2017-02-02 14:43:51 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-03-27 10:20:28 +0200 |
| commit | 9a93848fe787a53aec404e4e00d8f7f9bbdaebb4 (patch) | |
| tree | 4e3b4f0b97838278a72f47a4b4ed2825610e1969 /arch/x86/um | |
| parent | x86/ftrace: Use Makefile logic instead of #ifdef for compiling ftrace_*.o (diff) | |
| download | linux-9a93848fe787a53aec404e4e00d8f7f9bbdaebb4.tar.xz linux-9a93848fe787a53aec404e4e00d8f7f9bbdaebb4.zip | |
x86/debug: Implement __WARN() using UD0
By using "UD0" for WARN()s we remove the function call and its possible
__FILE__ and __LINE__ immediate arguments from the instruction stream.
Total image size will not change much, what we win in the instruction
stream we'll lose because of the __bug_table entries. Still, saves on
I$ footprint and the total image size does go down a bit.
text data filename
10702123 4530992 defconfig-build/vmlinux.orig
10682460 4530992 defconfig-build/vmlinux.patched
(UML didn't seem to use GENERIC_BUG at all, so remove it)
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Richard Weinberger <richard.weinberger@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/um')
| -rw-r--r-- | arch/x86/um/Makefile | 2 | ||||
| -rw-r--r-- | arch/x86/um/bug.c | 21 |
2 files changed, 1 insertions, 22 deletions
diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile index e7e7055a8658..76f17f05446f 100644 --- a/arch/x86/um/Makefile +++ b/arch/x86/um/Makefile @@ -8,7 +8,7 @@ else BITS := 64 endif -obj-y = bug.o bugs_$(BITS).o delay.o fault.o ldt.o \ +obj-y = bugs_$(BITS).o delay.o fault.o ldt.o \ ptrace_$(BITS).o ptrace_user.o setjmp_$(BITS).o signal.o \ stub_$(BITS).o stub_segv.o \ sys_call_table_$(BITS).o sysrq_$(BITS).o tls_$(BITS).o \ diff --git a/arch/x86/um/bug.c b/arch/x86/um/bug.c deleted file mode 100644 index e8034e363d83..000000000000 --- a/arch/x86/um/bug.c +++ /dev/null @@ -1,21 +0,0 @@ -/* - * Copyright (C) 2006 Jeff Dike (jdike@addtoit.com) - * Licensed under the GPL V2 - */ - -#include <linux/uaccess.h> - -/* - * Mostly copied from i386/x86_86 - eliminated the eip < PAGE_OFFSET because - * that's not relevant in skas mode. - */ - -int is_valid_bugaddr(unsigned long eip) -{ - unsigned short ud2; - - if (probe_kernel_address((unsigned short __user *)eip, ud2)) - return 0; - - return ud2 == 0x0b0f; -} |