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Date:      Fri, 20 Sep 2024 10:05:17 GMT
From:      Zhenlei Huang <zlei@FreeBSD.org>
To:        src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org
Subject:   git: 497f577f460b - stable/14 - kernel: Make some compile time constant variables const
Message-ID:  <202409201005.48KA5HZH050908@gitrepo.freebsd.org>

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The branch stable/14 has been updated by zlei:

URL: https://cgit.FreeBSD.org/src/commit/?id=497f577f460ba93dda38910bf49b390fa610480f

commit 497f577f460ba93dda38910bf49b390fa610480f
Author:     Zhenlei Huang <zlei@FreeBSD.org>
AuthorDate: 2024-08-30 10:26:30 +0000
Commit:     Zhenlei Huang <zlei@FreeBSD.org>
CommitDate: 2024-09-20 10:04:02 +0000

    kernel: Make some compile time constant variables const
    
    Those variables are not going to be changed at runtime. Make them const
    to avoid potential overwriting. This will also help spotting accidental
    global variables shadowing, since the variable's name such as `version`
    is short and commonly used.
    
    This change was inspired by reviewing khng's work D44760.
    
    No functional change intended.
    
    MFC after:      2 weeks
    Differential Revision:  https://reviews.freebsd.org/D45227
    
    (cherry picked from commit 356be1348dac94ba0d2dc1f479bc1f8a2ebaa03a)
---
 sys/arm/arm/identcpu-v6.c     |  6 +++---
 sys/arm64/arm64/identcpu.c    |  2 +-
 sys/conf/newvers.sh           | 14 +++++++-------
 sys/kern/init_main.c          | 24 ++++++++++++------------
 sys/kern/kern_mib.c           | 16 ++++++++--------
 sys/powerpc/powerpc/machdep.c |  5 +++--
 sys/riscv/riscv/identcpu.c    |  6 +++---
 sys/sys/copyright.h           |  4 ++--
 sys/sys/sysctl.h              |  8 ++++----
 sys/sys/systm.h               |  8 ++++----
 sys/x86/x86/identcpu.c        |  6 +++---
 11 files changed, 50 insertions(+), 49 deletions(-)

diff --git a/sys/arm/arm/identcpu-v6.c b/sys/arm/arm/identcpu-v6.c
index 6293a5ccaceb..83e3e255d50e 100644
--- a/sys/arm/arm/identcpu-v6.c
+++ b/sys/arm/arm/identcpu-v6.c
@@ -50,10 +50,10 @@
 #include <machine/cpu.h>
 #include <machine/md_var.h>
 
-char machine[] = "arm";
+const char machine[] = "arm";
 
-SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD | CTLFLAG_CAPRD,
-	machine, 0, "Machine class");
+SYSCTL_CONST_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD | CTLFLAG_CAPRD,
+    machine, "Machine class");
 
 static char cpu_model[64];
 SYSCTL_STRING(_hw, HW_MODEL, model, CTLFLAG_RD | CTLFLAG_CAPRD,
diff --git a/sys/arm64/arm64/identcpu.c b/sys/arm64/arm64/identcpu.c
index cc2c95d7cfb6..84ad2d0eb282 100644
--- a/sys/arm64/arm64/identcpu.c
+++ b/sys/arm64/arm64/identcpu.c
@@ -60,7 +60,7 @@ static void print_cpu_caches(struct sbuf *sb, struct cpu_desc *desc);
 static u_long parse_cpu_features_hwcap32(void);
 #endif
 
-char machine[] = "arm64";
+const char machine[] = "arm64";
 
 #ifdef SCTL_MASK32
 extern int adaptive_machine_arch;
diff --git a/sys/conf/newvers.sh b/sys/conf/newvers.sh
index d5ea53664606..3edff3630ae3 100644
--- a/sys/conf/newvers.sh
+++ b/sys/conf/newvers.sh
@@ -306,13 +306,13 @@ $COPYRIGHT
 #define VERSTR "${VERSTR}"
 #define RELSTR "${RELEASE}"
 
-char sccs[sizeof(SCCSSTR) > 128 ? sizeof(SCCSSTR) : 128] = SCCSSTR;
-char version[sizeof(VERSTR) > 256 ? sizeof(VERSTR) : 256] = VERSTR;
-char compiler_version[] = "${compiler_v}";
-char ostype[] = "${TYPE}";
-char osrelease[sizeof(RELSTR) > 32 ? sizeof(RELSTR) : 32] = RELSTR;
-int osreldate = ${RELDATE};
-char kern_ident[] = "${i}";
+const char sccs[sizeof(SCCSSTR) > 128 ? sizeof(SCCSSTR) : 128] = SCCSSTR;
+const char version[sizeof(VERSTR) > 256 ? sizeof(VERSTR) : 256] = VERSTR;
+const char compiler_version[] = "${compiler_v}";
+const char ostype[] = "${TYPE}";
+const char osrelease[sizeof(RELSTR) > 32 ? sizeof(RELSTR) : 32] = RELSTR;
+const int osreldate = ${RELDATE};
+const char kern_ident[] = "${i}";
 EOF
 )
 vers_content_old=$(cat vers.c 2>/dev/null || true)
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 917c3ea07baf..1575287716ee 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -367,36 +367,36 @@ print_version(const void *data __unused)
 	printf("%s\n", compiler_version);
 }
 
-SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
+C_SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
     copyright);
-SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
+C_SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
     trademark);
-SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
+C_SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
 
 #ifdef WITNESS
-static char wit_warn[] =
+static const char wit_warn[] =
      "WARNING: WITNESS option enabled, expect reduced performance.\n";
-SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_FOURTH,
+C_SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_FOURTH,
    print_caddr_t, wit_warn);
-SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_FOURTH,
+C_SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_FOURTH,
    print_caddr_t, wit_warn);
 #endif
 
 #ifdef DIAGNOSTIC
-static char diag_warn[] =
+static const char diag_warn[] =
      "WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
-SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH,
+C_SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH,
     print_caddr_t, diag_warn);
-SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_FIFTH,
+C_SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_FIFTH,
     print_caddr_t, diag_warn);
 #endif
 
 #if __SIZEOF_LONG__ == 4
-static char ilp32_warn[] =
+static const char ilp32_warn[] =
     "WARNING: 32-bit kernels are deprecated and may be removed in FreeBSD 15.0.\n";
-SYSINIT(ilp32warn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH,
+C_SYSINIT(ilp32warn, SI_SUB_COPYRIGHT, SI_ORDER_FIFTH,
     print_caddr_t, ilp32_warn);
-SYSINIT(ilp32warn2, SI_SUB_LAST, SI_ORDER_FIFTH,
+C_SYSINIT(ilp32warn2, SI_SUB_LAST, SI_ORDER_FIFTH,
     print_caddr_t, ilp32_warn);
 #endif
 
diff --git a/sys/kern/kern_mib.c b/sys/kern/kern_mib.c
index 10bf4cde6489..d60c72a00f63 100644
--- a/sys/kern/kern_mib.c
+++ b/sys/kern/kern_mib.c
@@ -94,20 +94,20 @@ SYSCTL_ROOT_NODE(OID_AUTO, regression, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
     "Regression test MIB");
 #endif
 
-SYSCTL_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD,
-    kern_ident, 0, "Kernel identifier");
+SYSCTL_CONST_STRING(_kern, OID_AUTO, ident, CTLFLAG_RD,
+    kern_ident, "Kernel identifier");
 
 SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD | CTLFLAG_CAPRD,
     SYSCTL_NULL_INT_PTR, BSD, "Operating system revision");
 
-SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD,
-    version, 0, "Kernel version");
+SYSCTL_CONST_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD,
+    version, "Kernel version");
 
-SYSCTL_STRING(_kern, OID_AUTO, compiler_version, CTLFLAG_RD,
-    compiler_version, 0, "Version of compiler used to compile kernel");
+SYSCTL_CONST_STRING(_kern, OID_AUTO, compiler_version, CTLFLAG_RD,
+    compiler_version, "Version of compiler used to compile kernel");
 
-SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD | CTLFLAG_CAPRD,
-    ostype, 0, "Operating system type");
+SYSCTL_CONST_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD | CTLFLAG_CAPRD,
+    ostype, "Operating system type");
 
 SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
     &maxproc, 0, "Maximum number of processes");
diff --git a/sys/powerpc/powerpc/machdep.c b/sys/powerpc/powerpc/machdep.c
index 638153ba49bc..899fb430e5d9 100644
--- a/sys/powerpc/powerpc/machdep.c
+++ b/sys/powerpc/powerpc/machdep.c
@@ -152,8 +152,9 @@ static char init_kenv[2048];
 
 static struct trapframe frame0;
 
-char		machine[] = "powerpc";
-SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD | CTLFLAG_CAPRD, machine, 0, "");
+const char	machine[] = "powerpc";
+SYSCTL_CONST_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD | CTLFLAG_CAPRD,
+    machine, "Machine class");
 
 static void	cpu_startup(void *);
 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
diff --git a/sys/riscv/riscv/identcpu.c b/sys/riscv/riscv/identcpu.c
index 385acb29381b..8f1bd7990393 100644
--- a/sys/riscv/riscv/identcpu.c
+++ b/sys/riscv/riscv/identcpu.c
@@ -60,10 +60,10 @@
 #include <dev/ofw/ofw_bus_subr.h>
 #endif
 
-char machine[] = "riscv";
+const char machine[] = "riscv";
 
-SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD | CTLFLAG_CAPRD, machine, 0,
-    "Machine class");
+SYSCTL_CONST_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD | CTLFLAG_CAPRD,
+    machine, "Machine class");
 
 /* Hardware implementation info. These values may be empty. */
 register_t mvendorid;	/* The CPU's JEDEC vendor ID */
diff --git a/sys/sys/copyright.h b/sys/sys/copyright.h
index ee6f5b805164..176e15d21dc2 100644
--- a/sys/sys/copyright.h
+++ b/sys/sys/copyright.h
@@ -45,5 +45,5 @@
 #define COPYRIGHT_UCB \
 	"Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994\n\tThe Regents of the University of California. All rights reserved.\n"
 
-char copyright[] = COPYRIGHT_Vendor COPYRIGHT_FreeBSD COPYRIGHT_UCB;
-char trademark[] = TRADEMARK_Foundation;
+const char copyright[] = COPYRIGHT_Vendor COPYRIGHT_FreeBSD COPYRIGHT_UCB;
+const char trademark[] = TRADEMARK_Foundation;
diff --git a/sys/sys/sysctl.h b/sys/sys/sysctl.h
index 76cbae25f4e5..0cfa2a7bd245 100644
--- a/sys/sys/sysctl.h
+++ b/sys/sys/sysctl.h
@@ -1155,10 +1155,10 @@ SYSCTL_DECL(_regression);
 SYSCTL_DECL(_security);
 SYSCTL_DECL(_security_bsd);
 
-extern char	machine[];
-extern char	osrelease[];
-extern char	ostype[];
-extern char	kern_ident[];
+extern const char	machine[];
+extern const char	osrelease[];
+extern const char	ostype[];
+extern const char	kern_ident[];
 
 /* Dynamic oid handling */
 struct sysctl_oid *sysctl_add_oid(struct sysctl_ctx_list *clist,
diff --git a/sys/sys/systm.h b/sys/sys/systm.h
index 581b981ef9e0..973a7604fe5f 100644
--- a/sys/sys/systm.h
+++ b/sys/sys/systm.h
@@ -53,9 +53,9 @@ __NULLABILITY_PRAGMA_PUSH
 extern int cold;		/* nonzero if we are doing a cold boot */
 extern int suspend_blocked;	/* block suspend due to pending shutdown */
 extern int rebooting;		/* kern_reboot() has been called. */
-extern char version[];		/* system version */
-extern char compiler_version[];	/* compiler version */
-extern char copyright[];	/* system copyright */
+extern const char version[];	/* system version */
+extern const char compiler_version[];	/* compiler version */
+extern const char copyright[];	/* system copyright */
 extern int kstack_pages;	/* number of kernel stack pages */
 
 extern u_long pagesizes[];	/* supported page sizes */
@@ -113,7 +113,7 @@ struct ucred;
 })
 #define	SCHEDULER_STOPPED() SCHEDULER_STOPPED_TD(curthread)
 
-extern int osreldate;
+extern const int osreldate;
 
 extern const void *zero_region;	/* address space maps to a zeroed page	*/
 
diff --git a/sys/x86/x86/identcpu.c b/sys/x86/x86/identcpu.c
index 36056b85101b..d97c9c47e97d 100644
--- a/sys/x86/x86/identcpu.c
+++ b/sys/x86/x86/identcpu.c
@@ -120,7 +120,7 @@ u_int	cpu_power_eax;		/* 06H: Power management leaf, %eax */
 u_int	cpu_power_ebx;		/* 06H: Power management leaf, %ebx */
 u_int	cpu_power_ecx;		/* 06H: Power management leaf, %ecx */
 u_int	cpu_power_edx;		/* 06H: Power management leaf, %edx */
-char machine[] = MACHINE;
+const char machine[] = MACHINE;
 
 SYSCTL_UINT(_hw, OID_AUTO, via_feature_rng, CTLFLAG_RD,
     &via_feature_rng, 0,
@@ -154,8 +154,8 @@ sysctl_hw_machine(SYSCTL_HANDLER_ARGS)
 SYSCTL_PROC(_hw, HW_MACHINE, machine, CTLTYPE_STRING | CTLFLAG_RD |
     CTLFLAG_CAPRD | CTLFLAG_MPSAFE, NULL, 0, sysctl_hw_machine, "A", "Machine class");
 #else
-SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD | CTLFLAG_CAPRD,
-    machine, 0, "Machine class");
+SYSCTL_CONST_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD | CTLFLAG_CAPRD,
+    machine, "Machine class");
 #endif
 
 char cpu_model[128];



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