Re: Confusion in usr/include/asm-generic/fcntl.h

From: Helge Deller
Date: Tue Jan 27 2009 - 17:35:42 EST

Arnd Bergmann wrote:
> On Wednesday 21 January 2009, Helge Deller wrote:
>> From: Arnd Bergmann <arnd@xxxxxxxx>
>>>> On parisc, there is a major confusion in this area, at some point, all
>>>> checks for __LP64__ got replaced with CONFIG_64BIT there. While I have
>>>> not understood what the problem with __LP64__ was, the check for
>>>> CONFIG_64BIT on parisc user space looks very wrong.
>> I think the parisc mess is my fault. I once replaced the __LP64__ by
>> CONFIG_64BIT and forgot that some files are exported to userspace.
>> I'll clean that up and send patches.
>
> I have a patch set that introduces a lot more asm-generic headers where
> I also need a generic way to check for this. The approach I chose
> here was to check "#if __BITS_PER_LONG == 64" for anything that is
> exported to user space. Maybe you can #define this in asm/types.h
> and use this check in the parisc headers as well.

As per your suggestion, the patch below fixes the problem that the
CONFIG_64BIT kernel config option is exported to userspace on parisc by mistake.
Tested on 32- and 64-bit parisc kernel builds and with "make headers_check".

arch/parisc/include/asm/:
assembly.h | 20 +++++++++++---------
msgbuf.h | 8 +++++---
pdc.h | 12 +++++-------
posix_types.h | 4 +++-
sembuf.h | 4 ++--
shmbuf.h | 13 +++++++------
signal.h | 2 +-
swab.h | 2 +-
types.h | 10 ++++++++++
9 files changed, 45 insertions(+), 30 deletions(-)

--------------------
parisc: do not export kernel config options to userspace in asm/ header files

Signed-off-by: Helge Deller <deller@xxxxxx>

diff --git a/arch/parisc/include/asm/assembly.h b/arch/parisc/include/asm/assembly.h
index ab7cc37..b950843 100644
--- a/arch/parisc/include/asm/assembly.h
+++ b/arch/parisc/include/asm/assembly.h
@@ -21,9 +21,11 @@
#ifndef _PARISC_ASSEMBLY_H
#define _PARISC_ASSEMBLY_H

+#include <asm/types.h>
+
#define CALLEE_FLOAT_FRAME_SIZE 80

-#ifdef CONFIG_64BIT
+#if __BITS_PER_LONG == 64
#define LDREG ldd
#define STREG std
#define LDREGX ldd,s
@@ -37,7 +39,7 @@
#define FRAME_SIZE 128
#define CALLEE_REG_FRAME_SIZE 144
#define ASM_ULONG_INSN .dword
-#else /* CONFIG_64BIT */
+#else /* __BITS_PER_LONG == 64 */
#define LDREG ldw
#define STREG stw
#define LDREGX ldwx,s
@@ -58,7 +60,7 @@
#ifdef CONFIG_PA20
#define LDCW ldcw,co
#define BL b,l
-# ifdef CONFIG_64BIT
+# if __BITS_PER_LONG == 64
# define LEVEL 2.0w
# else
# define LEVEL 2.0
@@ -71,7 +73,7 @@

#ifdef __ASSEMBLY__

-#ifdef CONFIG_64BIT
+#if __BITS_PER_LONG == 64
/* the 64-bit pa gnu assembler unfortunately defaults to .level 1.1 or 2.0 so
* work around that for now... */
.level 2.0w
@@ -162,7 +164,7 @@
.endm

.macro loadgp
-#ifdef CONFIG_64BIT
+#if __BITS_PER_LONG == 64
ldil L%__gp, %r27
ldo R%__gp(%r27), %r27
#else
@@ -340,7 +342,7 @@
fldd,mb -8(%r30), %fr12
.endm

-#ifdef CONFIG_64BIT
+#if __BITS_PER_LONG == 64
.macro callee_save
std,ma %r3, CALLEE_REG_FRAME_SIZE(%r30)
mfctl %cr27, %r3
@@ -383,7 +385,7 @@
ldd,mb -CALLEE_REG_FRAME_SIZE(%r30), %r3
.endm

-#else /* ! CONFIG_64BIT */
+#else /* ! __BITS_PER_LONG == 64 */

.macro callee_save
stw,ma %r3, CALLEE_REG_FRAME_SIZE(%r30)
@@ -426,7 +428,7 @@
mtctl %r3, %cr27
ldw,mb -CALLEE_REG_FRAME_SIZE(%r30), %r3
.endm
-#endif /* ! CONFIG_64BIT */
+#endif /* ! __BITS_PER_LONG == 64 */

.macro save_specials regs

@@ -447,7 +449,7 @@
mtctl %r0, %cr18
SAVE_CR (%cr18, PT_IAOQ1(\regs))

-#ifdef CONFIG_64BIT
+#if __BITS_PER_LONG == 64
/* cr11 (sar) is a funny one. 5 bits on PA1.1 and 6 bit on PA2.0
* For PA2.0 mtsar or mtctl always write 6 bits, but mfctl only
* reads 5 bits. Use mfctl,w to read all six bits. Otherwise
diff --git a/arch/parisc/include/asm/msgbuf.h b/arch/parisc/include/asm/msgbuf.h
index fe88f26..a4520f5 100644
--- a/arch/parisc/include/asm/msgbuf.h
+++ b/arch/parisc/include/asm/msgbuf.h
@@ -1,6 +1,8 @@
#ifndef _PARISC_MSGBUF_H
#define _PARISC_MSGBUF_H

+#include <linux/types.h>
+
/*
* The msqid64_ds structure for parisc architecture, copied from sparc.
* Note extra padding because this structure is passed back and forth
@@ -13,15 +15,15 @@

struct msqid64_ds {
struct ipc64_perm msg_perm;
-#ifndef CONFIG_64BIT
+#if __BITS_PER_LONG == 32
unsigned int __pad1;
#endif
__kernel_time_t msg_stime; /* last msgsnd time */
-#ifndef CONFIG_64BIT
+#if __BITS_PER_LONG == 32
unsigned int __pad2;
#endif
__kernel_time_t msg_rtime; /* last msgrcv time */
-#ifndef CONFIG_64BIT
+#if __BITS_PER_LONG == 32
unsigned int __pad3;
#endif
__kernel_time_t msg_ctime; /* last change time */
diff --git a/arch/parisc/include/asm/pdc.h b/arch/parisc/include/asm/pdc.h
index c584b00..f118764 100644
--- a/arch/parisc/include/asm/pdc.h
+++ b/arch/parisc/include/asm/pdc.h
@@ -336,10 +336,11 @@
#define NUM_PDC_RESULT 32

#if !defined(__ASSEMBLY__)
-#ifdef __KERNEL__

#include <linux/types.h>

+#ifdef __KERNEL__
+
extern int pdc_type;

/* Values for pdc_type */
@@ -374,7 +375,7 @@ struct pdc_model { /* for PDC_MODEL */

struct pdc_cache_cf { /* for PDC_CACHE (I/D-caches) */
unsigned long
-#ifdef CONFIG_64BIT
+#if __BITS_PER_LONG == 64
cc_padW:32,
#endif
cc_alias: 4, /* alias boundaries for virtual addresses */
@@ -390,7 +391,7 @@ struct pdc_cache_cf { /* for PDC_CACHE (I/D-caches) */

struct pdc_tlb_cf { /* for PDC_CACHE (I/D-TLB's) */
unsigned long tc_pad0:12, /* reserved */
-#ifdef CONFIG_64BIT
+#if __BITS_PER_LONG == 64
tc_padW:32,
#endif
tc_sh : 2, /* 0 = separate I/D-TLB, else shared I/D-TLB */
@@ -478,7 +479,6 @@ struct pdc_btlb_info { /* PDC_BLOCK_TLB, return of PDC_BTLB_INFO */

#endif /* !CONFIG_PA20 */

-#ifdef CONFIG_64BIT
struct pdc_memory_table_raddr { /* PDC_MEM/PDC_MEM_TABLE (return info) */
unsigned long entries_returned;
unsigned long entries_total;
@@ -489,7 +489,6 @@ struct pdc_memory_table { /* PDC_MEM/PDC_MEM_TABLE (arguments) */
unsigned int pages;
unsigned int reserved;
};
-#endif /* CONFIG_64BIT */

struct pdc_system_map_mod_info { /* PDC_SYSTEM_MAP/FIND_MODULE */
unsigned long mod_addr;
@@ -636,10 +635,9 @@ int pdc_get_initiator(struct hardware_path *, struct pdc_initiator *);
int pdc_tod_read(struct pdc_tod *tod);
int pdc_tod_set(unsigned long sec, unsigned long usec);

-#ifdef CONFIG_64BIT
+/* pdc_mem_mem_table - only available on 64bit */
int pdc_mem_mem_table(struct pdc_memory_table_raddr *r_addr,
struct pdc_memory_table *tbl, unsigned long entries);
-#endif

void set_firmware_width(void);
void set_firmware_width_unlocked(void);
diff --git a/arch/parisc/include/asm/posix_types.h b/arch/parisc/include/asm/posix_types.h
index 00da29a..6946cdc 100644
--- a/arch/parisc/include/asm/posix_types.h
+++ b/arch/parisc/include/asm/posix_types.h
@@ -1,6 +1,8 @@
#ifndef __ARCH_PARISC_POSIX_TYPES_H
#define __ARCH_PARISC_POSIX_TYPES_H

+#include <asm/types.h>
+
/*
* This file is generally used by user-level software, so you need to
* be a little careful about namespace pollution etc. Also, we cannot
@@ -20,7 +22,7 @@ typedef int __kernel_timer_t;
typedef int __kernel_clockid_t;
typedef int __kernel_daddr_t;
/* Note these change from narrow to wide kernels */
-#ifdef CONFIG_64BIT
+#if __BITS_PER_LONG == 64
typedef unsigned long __kernel_size_t;
typedef long __kernel_ssize_t;
typedef long __kernel_ptrdiff_t;
diff --git a/arch/parisc/include/asm/sembuf.h b/arch/parisc/include/asm/sembuf.h
index 1e59ffd..d27e904 100644
--- a/arch/parisc/include/asm/sembuf.h
+++ b/arch/parisc/include/asm/sembuf.h
@@ -13,11 +13,11 @@

struct semid64_ds {
struct ipc64_perm sem_perm; /* permissions .. see ipc.h */
-#ifndef CONFIG_64BIT
+#if __BITS_PER_LONG == 32
unsigned int __pad1;
#endif
__kernel_time_t sem_otime; /* last semop time */
-#ifndef CONFIG_64BIT
+#if __BITS_PER_LONG == 32
unsigned int __pad2;
#endif
__kernel_time_t sem_ctime; /* last change time */
diff --git a/arch/parisc/include/asm/shmbuf.h b/arch/parisc/include/asm/shmbuf.h
index 0a3eada..d133bf4 100644
--- a/arch/parisc/include/asm/shmbuf.h
+++ b/arch/parisc/include/asm/shmbuf.h
@@ -1,6 +1,8 @@
#ifndef _PARISC_SHMBUF_H
#define _PARISC_SHMBUF_H

+#include <linux/types.h>
+
/*
* The shmid64_ds structure for parisc architecture.
* Note extra padding because this structure is passed back and forth
@@ -13,19 +15,19 @@

struct shmid64_ds {
struct ipc64_perm shm_perm; /* operation perms */
-#ifndef CONFIG_64BIT
+#if __BITS_PER_LONG == 32
unsigned int __pad1;
#endif
__kernel_time_t shm_atime; /* last attach time */
-#ifndef CONFIG_64BIT
+#if __BITS_PER_LONG == 32
unsigned int __pad2;
#endif
__kernel_time_t shm_dtime; /* last detach time */
-#ifndef CONFIG_64BIT
+#if __BITS_PER_LONG == 32
unsigned int __pad3;
#endif
__kernel_time_t shm_ctime; /* last change time */
-#ifndef CONFIG_64BIT
+#if __BITS_PER_LONG == 32
unsigned int __pad4;
#endif
size_t shm_segsz; /* size of segment (bytes) */
@@ -36,13 +38,12 @@ struct shmid64_ds {
unsigned int __unused2;
};

-#ifdef CONFIG_64BIT
+
/* The 'unsigned int' (formerly 'unsigned long') data types below will
* ensure that a 32-bit app calling shmctl(*,IPC_INFO,*) will work on
* a wide kernel, but if some of these values are meant to contain pointers
* they may need to be 'long long' instead. -PB XXX FIXME
*/
-#endif
struct shminfo64 {
unsigned int shmmax;
unsigned int shmmin;
diff --git a/arch/parisc/include/asm/signal.h b/arch/parisc/include/asm/signal.h
index c203563..3de6265 100644
--- a/arch/parisc/include/asm/signal.h
+++ b/arch/parisc/include/asm/signal.h
@@ -105,7 +105,7 @@
struct siginfo;

/* Type of a signal handler. */
-#ifdef CONFIG_64BIT
+#if __BITS_PER_LONG == 64
/* function pointers on 64-bit parisc are pointers to little structs and the
* compiler doesn't support code which changes or tests the address of
* the function in the little struct. This is really ugly -PB
diff --git a/arch/parisc/include/asm/swab.h b/arch/parisc/include/asm/swab.h
index 3ff16c5..e78403b 100644
--- a/arch/parisc/include/asm/swab.h
+++ b/arch/parisc/include/asm/swab.h
@@ -1,7 +1,7 @@
#ifndef _PARISC_SWAB_H
#define _PARISC_SWAB_H

-#include <asm/types.h>
+#include <linux/types.h>
#include <linux/compiler.h>

#define __SWAB_64_THRU_32__
diff --git a/arch/parisc/include/asm/types.h b/arch/parisc/include/asm/types.h
index 7f5a39b..14bb5bd 100644
--- a/arch/parisc/include/asm/types.h
+++ b/arch/parisc/include/asm/types.h
@@ -9,6 +9,14 @@ typedef unsigned short umode_t;

#endif /* __ASSEMBLY__ */

+#ifndef __KERNEL__
+#ifdef __LP64__
+# define __BITS_PER_LONG 64
+#else
+# define __BITS_PER_LONG 32
+#endif /* __LP64__ */
+#endif /* __KERNEL__ */
+
/*
* These aren't exported outside the kernel to avoid name space clashes
*/
@@ -22,6 +30,8 @@ typedef unsigned short umode_t;
#define SHIFT_PER_LONG 5
#endif

+#define __BITS_PER_LONG BITS_PER_LONG
+
#ifndef __ASSEMBLY__

/* Dma addresses are 32-bits wide. */
--
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