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2010-09-24jump label: Fix GCC feature check when distcc is usedIngo Molnar
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>
2010-09-22jump label: Base patch for jump labelJason Baron
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>