selftests/rseq: Remove RSEQ_SKIP_FASTPATH code

This code is not currently build by the test Makefile, adds complexity,
and is not overall useful considering that the abort handling loops to
retry the fast-path.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221122203932.231377-10-mathieu.desnoyers@efficios.com

tools/testing/selftests/rseq/param_test.c

@@ -38,11 +38,7 @@ static int opt_yield, opt_signal, opt_sleep,
 		opt_disable_rseq, opt_threads = 200,
 		opt_disable_mod = 0, opt_test = 's', opt_mb = 0;
 
-#ifndef RSEQ_SKIP_FASTPATH
 static long long opt_reps = 5000;
-#else
-static long long opt_reps = 100;
-#endif
 
 static __thread __attribute__((tls_model("initial-exec")))
 unsigned int signals_delivered;

tools/testing/selftests/rseq/rseq-arm.h

@@ -79,10 +79,6 @@ do {									\
 	RSEQ_WRITE_ONCE(*p, v);						\
 } while (0)
 
-#ifdef RSEQ_SKIP_FASTPATH
-#include "rseq-skip.h"
-#else /* !RSEQ_SKIP_FASTPATH */
-
 #define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip,	\
 				post_commit_offset, abort_ip)		\
 		".pushsection __rseq_cs, \"aw\"\n\t"			\
@@ -823,5 +819,3 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
 	rseq_bug("expected value comparison failed");
 #endif
 }
-
-#endif /* !RSEQ_SKIP_FASTPATH */

tools/testing/selftests/rseq/rseq-arm64.h

@@ -85,10 +85,6 @@ do {										\
 	}									\
 } while (0)
 
-#ifdef RSEQ_SKIP_FASTPATH
-#include "rseq-skip.h"
-#else /* !RSEQ_SKIP_FASTPATH */
-
 #define RSEQ_ASM_TMP_REG32	"w15"
 #define RSEQ_ASM_TMP_REG	"x15"
 #define RSEQ_ASM_TMP_REG_2	"x14"
@@ -691,5 +687,3 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
 	rseq_bug("expected value comparison failed");
 #endif
 }
-
-#endif /* !RSEQ_SKIP_FASTPATH */

tools/testing/selftests/rseq/rseq-mips.h

@@ -60,10 +60,6 @@ do {									\
 	RSEQ_WRITE_ONCE(*p, v);						\
 } while (0)
 
-#ifdef RSEQ_SKIP_FASTPATH
-#include "rseq-skip.h"
-#else /* !RSEQ_SKIP_FASTPATH */
-
 #if _MIPS_SZLONG == 64
 # define LONG			".dword"
 # define LONG_LA		"dla"
@@ -773,5 +769,3 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
 	rseq_bug("expected value comparison failed");
 #endif
 }
-
-#endif /* !RSEQ_SKIP_FASTPATH */

tools/testing/selftests/rseq/rseq-ppc.h

@@ -36,10 +36,6 @@ do {									\
 	RSEQ_WRITE_ONCE(*p, v);						\
 } while (0)
 
-#ifdef RSEQ_SKIP_FASTPATH
-#include "rseq-skip.h"
-#else /* !RSEQ_SKIP_FASTPATH */
-
 /*
  * The __rseq_cs_ptr_array and __rseq_cs sections can be used by debuggers to
  * better handle single-stepping through the restartable critical sections.
@@ -787,5 +783,3 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
 	rseq_bug("expected value comparison failed");
 #endif
 }
-
-#endif /* !RSEQ_SKIP_FASTPATH */

tools/testing/selftests/rseq/rseq-riscv.h

@@ -49,10 +49,6 @@ do {									\
 	RSEQ_WRITE_ONCE(*(p), v);						\
 } while (0)
 
-#ifdef RSEQ_SKIP_FASTPATH
-#include "rseq-skip.h"
-#else /* !RSEQ_SKIP_FASTPATH */
-
 #define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip,	\
 				post_commit_offset, abort_ip)		\
 	".pushsection	__rseq_cs, \"aw\"\n"				\
@@ -673,5 +669,3 @@ int rseq_offset_deref_addv(intptr_t *ptr, off_t off, intptr_t inc, int cpu)
 	rseq_bug("cpu_id comparison failed");
 #endif
 }
-
-#endif /* !RSEQ_SKIP_FASTPATH */

tools/testing/selftests/rseq/rseq-s390.h

@@ -28,10 +28,6 @@ do {									\
 	RSEQ_WRITE_ONCE(*p, v);						\
 } while (0)
 
-#ifdef RSEQ_SKIP_FASTPATH
-#include "rseq-skip.h"
-#else /* !RSEQ_SKIP_FASTPATH */
-
 #ifdef __s390x__
 
 #define LONG_L			"lg"
@@ -607,4 +603,3 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
 	return rseq_cmpeqv_trymemcpy_storev(v, expect, dst, src, len,
 					    newv, cpu);
 }
-#endif /* !RSEQ_SKIP_FASTPATH */

tools/testing/selftests/rseq/rseq-skip.h

-/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
-/*
- * rseq-skip.h
- *
- * (C) Copyright 2017-2018 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- */
-
-static inline __attribute__((always_inline))
-int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
-{
-	return -1;
-}
-
-static inline __attribute__((always_inline))
-int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
-			       long voffp, intptr_t *load, int cpu)
-{
-	return -1;
-}
-
-static inline __attribute__((always_inline))
-int rseq_addv(intptr_t *v, intptr_t count, int cpu)
-{
-	return -1;
-}
-
-static inline __attribute__((always_inline))
-int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,
-				 intptr_t *v2, intptr_t newv2,
-				 intptr_t newv, int cpu)
-{
-	return -1;
-}
-
-static inline __attribute__((always_inline))
-int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,
-					 intptr_t *v2, intptr_t newv2,
-					 intptr_t newv, int cpu)
-{
-	return -1;
-}
-
-static inline __attribute__((always_inline))
-int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,
-			      intptr_t *v2, intptr_t expect2,
-			      intptr_t newv, int cpu)
-{
-	return -1;
-}
-
-static inline __attribute__((always_inline))
-int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,
-				 void *dst, void *src, size_t len,
-				 intptr_t newv, int cpu)
-{
-	return -1;
-}
-
-static inline __attribute__((always_inline))
-int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
-					 void *dst, void *src, size_t len,
-					 intptr_t newv, int cpu)
-{
-	return -1;
-}

tools/testing/selftests/rseq/rseq-x86.h

@@ -50,10 +50,6 @@ do {									\
 	RSEQ_WRITE_ONCE(*p, v);						\
 } while (0)
 
-#ifdef RSEQ_SKIP_FASTPATH
-#include "rseq-skip.h"
-#else /* !RSEQ_SKIP_FASTPATH */
-
 #define __RSEQ_ASM_DEFINE_TABLE(label, version, flags,			\
 				start_ip, post_commit_offset, abort_ip)	\
 		".pushsection __rseq_cs, \"aw\"\n\t"			\
@@ -629,8 +625,6 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
 					    newv, cpu);
 }
 
-#endif /* !RSEQ_SKIP_FASTPATH */
-
 #elif defined(__i386__)
 
 #define RSEQ_ASM_TP_SEGMENT	%%gs
@@ -657,10 +651,6 @@ do {									\
 	RSEQ_WRITE_ONCE(*p, v);						\
 } while (0)
 
-#ifdef RSEQ_SKIP_FASTPATH
-#include "rseq-skip.h"
-#else /* !RSEQ_SKIP_FASTPATH */
-
 /*
  * Use eax as scratch register and take memory operands as input to
  * lessen register pressure. Especially needed when compiling in O0.
@@ -1360,6 +1350,4 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
 #endif
 }
 
-#endif /* !RSEQ_SKIP_FASTPATH */
-
 #endif