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authorPeter Zijlstra <peterz@infradead.org>2017-02-02 14:43:51 +0100
committerIngo Molnar <mingo@kernel.org>2017-03-27 10:20:28 +0200
commit9a93848fe787a53aec404e4e00d8f7f9bbdaebb4 (patch)
tree4e3b4f0b97838278a72f47a4b4ed2825610e1969 /arch/x86/kernel/dumpstack.c
parent1fa9d67a2f07893fc7e4a880867a6cbb81dda547 (diff)
downloadlinux-9a93848fe787a53aec404e4e00d8f7f9bbdaebb4.tar.bz2
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/kernel/dumpstack.c')
-rw-r--r--arch/x86/kernel/dumpstack.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 09d4ac0d2661..924f45ea4382 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -289,9 +289,6 @@ void die(const char *str, struct pt_regs *regs, long err)
unsigned long flags = oops_begin();
int sig = SIGSEGV;
- if (!user_mode(regs))
- report_bug(regs->ip, regs);
-
if (__die(str, regs, err))
sig = 0;
oops_end(flags, regs, sig);