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d="scan'208";a="127436304" From: Andrew Cooper To: Xen-devel CC: Andrew Cooper , Nicola Vetrini , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Wei Liu , Roberto Bagnara Subject: [PATCH 1/6] x86/setup: Make the loader variable const Date: Mon, 20 Nov 2023 22:49:07 +0000 Message-ID: <20231120224912.1421916-2-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20231120224912.1421916-1-andrew.cooper3@citrix.com> References: <20231120224912.1421916-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1700520602080100003 It is never written to, but has a string literal assigned, and needs to be const to support -Wwrite-strings Suggested-by: Nicola Vetrini Signed-off-by: Andrew Cooper Acked-by: Stefano Stabellini Reviewed-by: Jan Beulich Reviewed-by: Stefano Stabellini --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: Wei Liu CC: Roberto Bagnara CC: Nicola Vetrini --- xen/arch/x86/setup.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c index a3d3f797bb1e..c41dfdb2bdf8 100644 --- a/xen/arch/x86/setup.c +++ b/xen/arch/x86/setup.c @@ -971,8 +971,8 @@ static struct domain *__init create_dom0(const module_t= *image, /* SAF-1-safe */ void __init noreturn __start_xen(unsigned long mbi_p) { - const char *memmap_type =3D NULL; - char *cmdline, *kextra, *loader; + const char *memmap_type =3D NULL, *loader; + char *cmdline, *kextra; void *bsp_stack; struct cpu_info *info =3D get_cpu_info(), *bsp_info; unsigned int initrdidx, num_parked =3D 0; @@ -1023,8 +1023,8 @@ void __init noreturn __start_xen(unsigned long mbi_p) mod =3D __va(mbi->mods_addr); } =20 - loader =3D (mbi->flags & MBI_LOADERNAME) - ? 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d="scan'208";a="128662992" From: Andrew Cooper To: Xen-devel CC: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Wei Liu , Stefano Stabellini , Julien Grall , Volodymyr Babchuk , Bertrand Marquis , Roberto Bagnara , Nicola Vetrini Subject: [PATCH 2/6] x86/setup: Rework cmdline_cook() to be compatible with -Wwrite-strings Date: Mon, 20 Nov 2023 22:49:08 +0000 Message-ID: <20231120224912.1421916-3-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20231120224912.1421916-1-andrew.cooper3@citrix.com> References: <20231120224912.1421916-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1700520602101100004 Constify both cmdline variables in create_dom0() and __start_xen(). Initialise Xen's variable to the empty string to simplify the parsing logic. Update cmdline_cook() to take and return const pointers, changing it to have an early exit for a NULL input (which can happen if the mbi-> pointers happ= en to be 0). Note this only compiles because strstr() launders the const off the pointer when assigning to the mutable kextra, but that logic only mutates the mbi->cmdline buffer. Signed-off-by: Andrew Cooper Acked-by: Stefano Stabellini Reviewed-by: Stefano Stabellini --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: Wei Liu CC: Stefano Stabellini CC: Julien Grall CC: Volodymyr Babchuk CC: Bertrand Marquis CC: Roberto Bagnara CC: Nicola Vetrini I don't particularly like this, but it's the best I can come up with. --- xen/arch/x86/setup.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c index c41dfdb2bdf8..a06a241943f6 100644 --- a/xen/arch/x86/setup.c +++ b/xen/arch/x86/setup.c @@ -837,9 +837,10 @@ static bool __init loader_is_grub2(const char *loader_= name) return (p !=3D NULL) && (p[5] !=3D '0'); } =20 -static char * __init cmdline_cook(char *p, const char *loader_name) +static const char *__init cmdline_cook(const char *p, const char *loader_n= ame) { - p =3D p ? : ""; + if ( !p ) + return ""; =20 /* Strip leading whitespace. */ while ( *p =3D=3D ' ' ) @@ -885,7 +886,7 @@ static struct domain *__init create_dom0(const module_t= *image, }, }; struct domain *d; - char *cmdline; + const char *cmdline; domid_t domid; =20 if ( opt_dom0_pvh ) @@ -971,8 +972,8 @@ static struct domain *__init create_dom0(const module_t= *image, /* SAF-1-safe */ void __init noreturn __start_xen(unsigned long mbi_p) { - const char *memmap_type =3D NULL, *loader; - char *cmdline, *kextra; + const char *memmap_type =3D NULL, *loader, *cmdline =3D ""; + char *kextra; void *bsp_stack; struct cpu_info *info =3D get_cpu_info(), *bsp_info; unsigned int initrdidx, num_parked =3D 0; @@ -1027,9 +1028,9 @@ void __init noreturn __start_xen(unsigned long mbi_p) : "unknown"; =20 /* Parse the command-line options. */ - cmdline =3D cmdline_cook((mbi->flags & MBI_CMDLINE) ? - __va(mbi->cmdline) : NULL, - loader); + if ( mbi->flags & MBI_CMDLINE ) + cmdline =3D cmdline_cook(__va(mbi->cmdline), loader); + if ( (kextra =3D strstr(cmdline, " -- ")) !=3D NULL ) { /* --=20 2.30.2 From nobody Thu May 16 15:35:27 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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d="scan'208";a="128218323" From: Andrew Cooper To: Xen-devel CC: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Wei Liu , Stefano Stabellini , Julien Grall , Volodymyr Babchuk , Bertrand Marquis , Michal Orzel , Roberto Bagnara , Nicola Vetrini Subject: [PATCH 3/6] xen/efi: Make efi-boot.h compile with -Wwrite-strings Date: Mon, 20 Nov 2023 22:49:09 +0000 Message-ID: <20231120224912.1421916-4-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20231120224912.1421916-1-andrew.cooper3@citrix.com> References: <20231120224912.1421916-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1700520600323100001 GCC complains: In file included from arch/arm/efi/boot.c:700: arch/arm/efi/efi-boot.h: In function 'efi_arch_handle_cmdline': arch/arm/efi/efi-boot.h:482:16: error: assignment discards 'const' qualif= ier from pointer target type [-Werror=3Ddiscarded-qualifiers] 482 | name.s =3D "xen"; | ^ There's no easy option. .rodata is really read-only, so the fact Xen doesn= 't crash means these strings aren't written to. Lie to the compiler using a union. Signed-off-by: Andrew Cooper Acked-by: Stefano Stabellini --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: Wei Liu CC: Stefano Stabellini CC: Julien Grall CC: Volodymyr Babchuk CC: Bertrand Marquis CC: Michal Orzel CC: Roberto Bagnara CC: Nicola Vetrini I *really* don't like this, but it's the only suggestion given. --- xen/arch/arm/efi/efi-boot.h | 2 +- xen/arch/x86/efi/efi-boot.h | 3 ++- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/xen/arch/arm/efi/efi-boot.h b/xen/arch/arm/efi/efi-boot.h index 1c3640bb65fd..c26bf18b68b9 100644 --- a/xen/arch/arm/efi/efi-boot.h +++ b/xen/arch/arm/efi/efi-boot.h @@ -479,7 +479,7 @@ static void __init efi_arch_handle_cmdline(CHAR16 *imag= e_name, w2s(&name); } else - name.s =3D "xen"; + name.cs =3D "xen"; /* TODO, find a better way of doing this. */ =20 prop_len =3D 0; prop_len +=3D snprintf(buf + prop_len, diff --git a/xen/arch/x86/efi/efi-boot.h b/xen/arch/x86/efi/efi-boot.h index eebc54180bf7..e2d256e0517b 100644 --- a/xen/arch/x86/efi/efi-boot.h +++ b/xen/arch/x86/efi/efi-boot.h @@ -324,7 +324,8 @@ static void __init efi_arch_handle_cmdline(CHAR16 *imag= e_name, w2s(&name); 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d="scan'208";a="127436305" From: Andrew Cooper To: Xen-devel CC: Andrew Cooper , Stefano Stabellini , Julien Grall , Volodymyr Babchuk , Bertrand Marquis , Michal Orzel , Roberto Bagnara , Nicola Vetrini Subject: [PATCH 4/6] arm/duart: make dt_uart_init() compile with -Wwrite-strings Date: Mon, 20 Nov 2023 22:49:10 +0000 Message-ID: <20231120224912.1421916-5-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20231120224912.1421916-1-andrew.cooper3@citrix.com> References: <20231120224912.1421916-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1700520594192100001 Content-Type: text/plain; charset="utf-8" GCC complains: drivers/char/arm-uart.c: In function 'dt_uart_init': drivers/char/arm-uart.c:81:17: error: assignment discards 'const' qualifi= er from pointer target type [-Werror=3Ddiscarded-qualifiers] 81 | options =3D ""; | ^ The problem is using the options string for both splitting opt_duart, and to hold a token "" for no options. Use two variables; one mutable one one const. Signed-off-by: Andrew Cooper Acked-by: Stefano Stabellini Reviewed-by: Stefano Stabellini --- CC: Stefano Stabellini CC: Julien Grall CC: Volodymyr Babchuk CC: Bertrand Marquis CC: Michal Orzel CC: Roberto Bagnara CC: Nicola Vetrini --- xen/drivers/char/arm-uart.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/xen/drivers/char/arm-uart.c b/xen/drivers/char/arm-uart.c index 8098a968c285..91f13a41368d 100644 --- a/xen/drivers/char/arm-uart.c +++ b/xen/drivers/char/arm-uart.c @@ -42,7 +42,8 @@ static void __init dt_uart_init(void) struct dt_device_node *dev; int ret; const char *devpath =3D opt_dtuart; - char *options; + const char *options; + char *split; =20 if ( !console_has("dtuart") ) return; /* Not for us */ @@ -74,9 +75,12 @@ static void __init dt_uart_init(void) return; } =20 - options =3D strchr(opt_dtuart, ':'); - if ( options !=3D NULL ) - *(options++) =3D '\0'; + split =3D strchr(opt_dtuart, ':'); + if ( split ) + { + split[0] =3D '\0'; + options =3D split + 1; 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d="scan'208";a="128662993" From: Andrew Cooper To: Xen-devel CC: Andrew Cooper , Stefano Stabellini , Julien Grall , Volodymyr Babchuk , Bertrand Marquis , Michal Orzel , Roberto Bagnara , Nicola Vetrini Subject: [PATCH 5/6] arm/platforms: Make compatbile with -Wwrite-strings Date: Mon, 20 Nov 2023 22:49:11 +0000 Message-ID: <20231120224912.1421916-6-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20231120224912.1421916-1-andrew.cooper3@citrix.com> References: <20231120224912.1421916-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1700520592041100003 GCC complains: arch/arm/platforms/brcm.c: In function =E2=80=98brcm_populate_plat_regs= =E2=80=99: arch/arm/platforms/brcm.c:76:27: error: passing argument 1 of =E2=80=98br= cm_get_dt_node=E2=80=99 discards =E2=80=98const=E2=80=99 qualifier from poi= nter target type [-Werror=3Ddiscarded-qualifiers] 76 | rc =3D brcm_get_dt_node("brcm,brcmstb-cpu-biu-ctrl", &node, &= reg_base); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ and arch/arm/platforms/exynos5.c: In function =E2=80=98exynos5_smp_init=E2=80= =99: arch/arm/platforms/exynos5.c:109:20: error: assignment discards =E2=80=98= const=E2=80=99 qualifier from pointer target type [-Werror=3Ddiscarded-qual= ifiers] 109 | compatible =3D "samsung,exynos4210-sysram-ns"; | ^ In both cases, just make the relevant variable const. Signed-off-by: Andrew Cooper Acked-by: Stefano Stabellini Reviewed-by: Stefano Stabellini --- CC: Stefano Stabellini CC: Julien Grall CC: Volodymyr Babchuk CC: Bertrand Marquis CC: Michal Orzel CC: Roberto Bagnara CC: Nicola Vetrini --- xen/arch/arm/platforms/brcm.c | 2 +- xen/arch/arm/platforms/exynos5.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/xen/arch/arm/platforms/brcm.c b/xen/arch/arm/platforms/brcm.c index 951e4d6cc328..43a07ab1a69d 100644 --- a/xen/arch/arm/platforms/brcm.c +++ b/xen/arch/arm/platforms/brcm.c @@ -35,7 +35,7 @@ static u32 brcm_boot_continuation_pc; =20 static struct brcm_plat_regs regs; =20 -static __init int brcm_get_dt_node(char *compat_str, +static __init int brcm_get_dt_node(const char *compat_str, const struct dt_device_node **dn, u32 *reg_base) { diff --git a/xen/arch/arm/platforms/exynos5.c b/xen/arch/arm/platforms/exyn= os5.c index c48093cd4fa4..f7c09520675e 100644 --- a/xen/arch/arm/platforms/exynos5.c +++ b/xen/arch/arm/platforms/exynos5.c @@ -96,7 +96,7 @@ static int __init exynos5_smp_init(void) { struct dt_device_node *node; 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d="scan'208";a="127436306" From: Andrew Cooper To: Xen-devel CC: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Wei Liu , Stefano Stabellini , Julien Grall , Volodymyr Babchuk , Bertrand Marquis , Michal Orzel , Roberto Bagnara , Nicola Vetrini Subject: [PATCH 6/6] xen: Enable -Wwrite-strings Date: Mon, 20 Nov 2023 22:49:12 +0000 Message-ID: <20231120224912.1421916-7-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20231120224912.1421916-1-andrew.cooper3@citrix.com> References: <20231120224912.1421916-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1700520606115100001 The codebase is now -Wwrite-strings clean. Activate the option to cause string literals to have a const type, and prevent any violations of MISRA R= ule 7.4 being reintroduced. Signed-off-by: Andrew Cooper Acked-by: Stefano Stabellini --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: Wei Liu CC: Stefano Stabellini CC: Julien Grall CC: Volodymyr Babchuk CC: Bertrand Marquis CC: Michal Orzel CC: Roberto Bagnara CC: Nicola Vetrini --- xen/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/Makefile b/xen/Makefile index 7b869f4b3037..ca571103c868 100644 --- a/xen/Makefile +++ b/xen/Makefile @@ -392,7 +392,7 @@ endif CFLAGS-$(CONFIG_CC_SPLIT_SECTIONS) +=3D -ffunction-sections -fdata-sections =20 CFLAGS +=3D -nostdinc -fno-builtin -fno-common -CFLAGS +=3D -Werror -Wredundant-decls -Wno-pointer-arith +CFLAGS +=3D -Werror -Wredundant-decls -Wwrite-strings -Wno-pointer-arith $(call cc-option-add,CFLAGS,CC,-Wvla) CFLAGS +=3D -pipe -D__XEN__ -include $(srctree)/include/xen/config.h CFLAGS-$(CONFIG_DEBUG_INFO) +=3D -g --=20 2.30.2