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Message-Id: <20190610212015.9157-6-hch@lst.de>
Date:   Mon, 10 Jun 2019 23:20:05 +0200
From:   Christoph Hellwig <hch@....de>
To:     Greg Ungerer <gerg@...ux-m68k.org>
Cc:     Michal Simek <monstr@...str.eu>,
        linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
        uclinux-h8-devel@...ts.sourceforge.jp,
        linux-m68k@...ts.linux-m68k.org, linux-riscv@...ts.infradead.org,
        linux-sh@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 05/15] binfmt_flat: replace flat_argvp_envp_on_stack with a Kconfig variable

This will eventually allow us to kill the need for an <asm/flat.h> for
many cases.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 arch/arm/Kconfig                   | 1 +
 arch/arm/include/asm/flat.h        | 2 --
 arch/c6x/include/asm/flat.h        | 1 -
 arch/h8300/Kconfig                 | 1 +
 arch/h8300/include/asm/flat.h      | 2 --
 arch/m68k/Kconfig                  | 1 +
 arch/m68k/include/asm/flat.h       | 1 -
 arch/microblaze/include/asm/flat.h | 2 --
 arch/sh/include/asm/flat.h         | 1 -
 arch/xtensa/include/asm/flat.h     | 1 -
 fs/Kconfig.binfmt                  | 3 +++
 fs/binfmt_flat.c                   | 5 +++--
 12 files changed, 9 insertions(+), 12 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 8869742a85df..b1b48c0bde76 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -30,6 +30,7 @@ config ARM
 	select ARCH_USE_BUILTIN_BSWAP
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select ARCH_WANT_IPC_PARSE_VERSION
+	select BINFMT_FLAT_ARGVP_ENVP_ON_STACK
 	select BUILDTIME_EXTABLE_SORT if MMU
 	select CLONE_BACKWARDS
 	select CPU_PM if SUSPEND || CPU_IDLE
diff --git a/arch/arm/include/asm/flat.h b/arch/arm/include/asm/flat.h
index acf162111ee2..bbc27901446f 100644
--- a/arch/arm/include/asm/flat.h
+++ b/arch/arm/include/asm/flat.h
@@ -8,8 +8,6 @@
 
 #include <linux/uaccess.h>
 
-#define	flat_argvp_envp_on_stack()		1
-
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/c6x/include/asm/flat.h b/arch/c6x/include/asm/flat.h
index 353e4d06e8c0..2d57a9204d21 100644
--- a/arch/c6x/include/asm/flat.h
+++ b/arch/c6x/include/asm/flat.h
@@ -4,7 +4,6 @@
 
 #include <asm/unaligned.h>
 
-#define flat_argvp_envp_on_stack()			0
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index d30e8727b02d..7457f190caaa 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -2,6 +2,7 @@
 config H8300
         def_bool y
 	select ARCH_32BIT_OFF_T
+	select BINFMT_FLAT_ARGVP_ENVP_ON_STACK
 	select BINFMT_FLAT_OLD_ALWAYS_RAM
 	select GENERIC_ATOMIC64
 	select HAVE_UID16
diff --git a/arch/h8300/include/asm/flat.h b/arch/h8300/include/asm/flat.h
index 14cc928d5478..4683146f0e9e 100644
--- a/arch/h8300/include/asm/flat.h
+++ b/arch/h8300/include/asm/flat.h
@@ -8,8 +8,6 @@
 
 #include <asm/unaligned.h>
 
-#define	flat_argvp_envp_on_stack()		1
-
 /*
  * on the H8 a couple of the relocations have an instruction in the
  * top byte.  As there can only be 24bits of address space,  we just
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 218e037ef901..fd69ee5ad6ab 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -7,6 +7,7 @@ config M68K
 	select ARCH_MIGHT_HAVE_PC_PARPORT if ISA
 	select ARCH_NO_COHERENT_DMA_MMAP if !MMU
 	select ARCH_NO_PREEMPT if !COLDFIRE
+	select BINFMT_FLAT_ARGVP_ENVP_ON_STACK
 	select HAVE_IDE
 	select HAVE_AOUT if MMU
 	select HAVE_DEBUG_BUGVERBOSE
diff --git a/arch/m68k/include/asm/flat.h b/arch/m68k/include/asm/flat.h
index 7b1fb5c2809e..d7102fcd43eb 100644
--- a/arch/m68k/include/asm/flat.h
+++ b/arch/m68k/include/asm/flat.h
@@ -8,7 +8,6 @@
 
 #include <linux/uaccess.h>
 
-#define	flat_argvp_envp_on_stack()		1
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/microblaze/include/asm/flat.h b/arch/microblaze/include/asm/flat.h
index 1cd8d7f4cf12..9e3d8e01d294 100644
--- a/arch/microblaze/include/asm/flat.h
+++ b/arch/microblaze/include/asm/flat.h
@@ -13,8 +13,6 @@
 
 #include <asm/unaligned.h>
 
-#define	flat_argvp_envp_on_stack()	0
-
 /*
  * Microblaze works a little differently from other arches, because
  * of the MICROBLAZE_64 reloc type. Here, a 32 bit address is split
diff --git a/arch/sh/include/asm/flat.h b/arch/sh/include/asm/flat.h
index 015678d7b771..1002343dd84a 100644
--- a/arch/sh/include/asm/flat.h
+++ b/arch/sh/include/asm/flat.h
@@ -11,7 +11,6 @@
 
 #include <asm/unaligned.h>
 
-#define	flat_argvp_envp_on_stack()		0
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/arch/xtensa/include/asm/flat.h b/arch/xtensa/include/asm/flat.h
index b215c1e66958..3d357371b28b 100644
--- a/arch/xtensa/include/asm/flat.h
+++ b/arch/xtensa/include/asm/flat.h
@@ -4,7 +4,6 @@
 
 #include <asm/unaligned.h>
 
-#define flat_argvp_envp_on_stack()			0
 static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
 					u32 *addr, u32 *persistent)
 {
diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index 5658e12ad944..82f7d7f234f3 100644
--- a/fs/Kconfig.binfmt
+++ b/fs/Kconfig.binfmt
@@ -97,6 +97,9 @@ config BINFMT_FLAT
 	help
 	  Support uClinux FLAT format binaries.
 
+config BINFMT_FLAT_ARGVP_ENVP_ON_STACK
+	bool
+
 config BINFMT_FLAT_OLD_ALWAYS_RAM
 	bool
 
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 18d82fd5f57c..c09651087eda 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -124,14 +124,15 @@ static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start
 
 	sp -= bprm->envc + 1;
 	sp -= bprm->argc + 1;
-	sp -= flat_argvp_envp_on_stack() ? 2 : 0;
+	if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK))
+		sp -= 2; /* argvp + envp */
 	sp -= 1;  /* &argc */
 
 	current->mm->start_stack = (unsigned long)sp & -FLAT_STACK_ALIGN;
 	sp = (unsigned long __user *)current->mm->start_stack;
 
 	__put_user(bprm->argc, sp++);
-	if (flat_argvp_envp_on_stack()) {
+	if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) {
 		unsigned long argv, envp;
 		argv = (unsigned long)(sp + 2);
 		envp = (unsigned long)(sp + 2 + bprm->argc + 1);
-- 
2.20.1

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