[CRIU] [PATCH 03/12] x86: cpu -- Use bitwise operator for option check

[Cyrill Gorcunov]

Usually people simply leave cpu checkin in default
mode (which is fpu level) but idea was to be able
to compose a mixture of settings, for this sake
CPU_CAP_ constants are bit shifts. Thus use bitwise
operator for this.

Same time define CPU_CAP_ as bit shifts explicitly
and use explicit CPU_CAP_NONE compare where needed.

Signed-off-by: Cyrill Gorcunov <gorcunov at gmail.com>
Reviewed-by: Dmitry Safonov <0x7f454c46 at gmaill.com>
---
 criu/arch/x86/cpu.c       |  6 +++---
 criu/include/cr_options.h | 10 +++++-----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/criu/arch/x86/cpu.c b/criu/arch/x86/cpu.c
index 9751261ab277..c59f9d63fe84 100644
--- a/criu/arch/x86/cpu.c
+++ b/criu/arch/x86/cpu.c
@@ -236,7 +236,7 @@ static int cpu_validate_features(compel_cpuinfo_t *cpu_info)
 	if (cpu_has_unsupported_features())
 		return -1;
 
-	if (opts.cpu_cap == CPU_CAP_FPU) {
+	if (opts.cpu_cap & CPU_CAP_FPU) {
 		/*
 		 * If we're requested to check FPU only ignore
 		 * any other bit. It's up to a user if the
@@ -288,7 +288,7 @@ static int cpu_validate_features(compel_cpuinfo_t *cpu_info)
 	/*
 	 * Capability on instructions level only.
 	 */
-	if (opts.cpu_cap == CPU_CAP_INS)
+	if (opts.cpu_cap & CPU_CAP_INS)
 		return cpu_validate_ins_features(cpu_info);
 
 	/*
@@ -458,7 +458,7 @@ int cpuinfo_check(void)
 	 * still allow to check instructions only
 	 * and etc.
 	 */
-	if (!opts.cpu_cap)
+	if (opts.cpu_cap == CPU_CAP_NONE)
 		opts.cpu_cap = CPU_CAP_ALL;
 
 	if (cpu_validate_cpuinfo())
diff --git a/criu/include/cr_options.h b/criu/include/cr_options.h
index 44588fce7a71..4de777be655e 100644
--- a/criu/include/cr_options.h
+++ b/criu/include/cr_options.h
@@ -24,11 +24,11 @@
 /*
  * CPU capability options.
  */
-#define CPU_CAP_NONE		(0u)
-#define CPU_CAP_ALL		(-1u)
-#define CPU_CAP_FPU		(1u)		/* Only FPU capability required */
-#define CPU_CAP_CPU		(2u)		/* Strict CPU capability required */
-#define CPU_CAP_INS (4u)			/* Instructions CPU capability */
+#define CPU_CAP_NONE		(0u << 0)	/* Don't check capability at all */
+#define CPU_CAP_FPU		(1u << 0)	/* Only FPU capability required */
+#define CPU_CAP_CPU		(1u << 1)	/* Strict CPU capability required */
+#define CPU_CAP_INS		(1u << 2)	/* Instructions CPU capability */
+#define CPU_CAP_ALL		(CPU_CAP_FPU | CPU_CAP_CPU | CPU_CAP_INS)
 #define CPU_CAP_DEFAULT		(CPU_CAP_FPU)
 
 struct cg_root_opt {
-- 
2.17.1