Some versions of ARM GCC which do support asm goto, do not support
the %c specifier. Since we need the %c to support jump labels
on ARM, detect that too in the asm goto detection script to avoid
build errors with these versions.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48637
Acked-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
The following build bug occurs on distcc builds:
CC arch/x86/kernel/asm-offsets.s
In file included from include/linux/module.h:24,
from include/linux/crypto.h:22,
from arch/x86/kernel/asm-offsets_64.c:9,
from arch/x86/kernel/asm-offsets.c:5:
include/trace/events/module.h: In function 'trace_module_load':
include/trace/events/module.h:18: error: expected '(' before 'goto'
include/trace/events/module.h:18: error: expected identifier or '*' before '(' token
It triggers because distcc is invoked by turning $CC into "distcc gcc",
but gcc-goto.sh check script was using $1 not $@ to expand parameters.
Cc: Jason Baron <jbaron@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <20100923034910.867858597@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
base patch to implement 'jump labeling'. Based on a new 'asm goto' inline
assembly gcc mechanism, we can now branch to labels from an 'asm goto'
statment. This allows us to create a 'no-op' fastpath, which can subsequently
be patched with a jump to the slowpath code. This is useful for code which
might be rarely used, but which we'd like to be able to call, if needed.
Tracepoints are the current usecase that these are being implemented for.
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jason Baron <jbaron@redhat.com>
LKML-Reference: <ee8b3595967989fdaf84e698dc7447d315ce972a.1284733808.git.jbaron@redhat.com>
[ cleaned up some formating ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Rabin Vincent
Jonathan Neuschäfer
Ingo Molnar
Jason Baron