iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

parisc: Align parisc MADV_XXX constants with all other architectures

Browse Source 
Adjust some MADV_XXX constants to be in sync what their values are on
all other platforms. There is currently no reason to have an own
numbering on parisc, but it requires workarounds in many userspace
sources (e.g. glibc, qemu, ...) - which are often forgotten and thus
introduce bugs and different behaviour on parisc.

A wrapper avoids an ABI breakage for existing userspace applications by
translating any old values to the new ones, so this change allows us to
move over all programs to the new ABI over time.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2022-12-11 19:50:20 +01:00
parent 41f563ab3c
commit 71bdea6f79
5 changed files with 49 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
arch/parisc/include/uapi/asm/mman.h
View File

@ -49,6 +49,19 @@
#define MADV_DONTFORK 10 /* don't inherit across fork */
#define MADV_DOFORK 11 /* do inherit across fork */
#define MADV_MERGEABLE 12 /* KSM may merge identical pages */
#define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */
#define MADV_HUGEPAGE 14 /* Worth backing with hugepages */
#define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages */
#define MADV_DONTDUMP 16 /* Explicity exclude from the core dump,
overrides the coredump filter bits */
#define MADV_DODUMP 17 /* Clear the MADV_NODUMP flag */
#define MADV_WIPEONFORK 18 /* Zero memory on fork, child only */
#define MADV_KEEPONFORK 19 /* Undo MADV_WIPEONFORK */
#define MADV_COLD 20 /* deactivate these pages */
#define MADV_PAGEOUT 21 /* reclaim these pages */
@ -57,27 +70,13 @@
#define MADV_DONTNEED_LOCKED 24 /* like DONTNEED, but drop locked pages too */
#define MADV_MERGEABLE 65 /* KSM may merge identical pages */
#define MADV_UNMERGEABLE 66 /* KSM may not merge identical pages */
#define MADV_HUGEPAGE 67 /* Worth backing with hugepages */
#define MADV_NOHUGEPAGE 68 /* Not worth backing with hugepages */
#define MADV_DONTDUMP 69 /* Explicity exclude from the core dump,
overrides the coredump filter bits */
#define MADV_DODUMP 70 /* Clear the MADV_NODUMP flag */
#define MADV_WIPEONFORK 71 /* Zero memory on fork, child only */
#define MADV_KEEPONFORK 72 /* Undo MADV_WIPEONFORK */
#define MADV_COLLAPSE 73 /* Synchronous hugepage collapse */
#define MADV_COLLAPSE 25 /* Synchronous hugepage collapse */
#define MADV_HWPOISON 100 /* poison a page for testing */
#define MADV_SOFT_OFFLINE 101 /* soft offline page for testing */
/* compatibility flags */
#define MAP_FILE 0
#define MAP_VARIABLE 0
#define PKEY_DISABLE_ACCESS 0x1
#define PKEY_DISABLE_WRITE 0x2

28
arch/parisc/kernel/sys_parisc.c
View File

@ -465,3 +465,31 @@ asmlinkage long parisc_inotify_init1(int flags)
flags = FIX_O_NONBLOCK(flags);
return sys_inotify_init1(flags);
}
/*
* madvise() wrapper
*
* Up to kernel v6.1 parisc has different values than all other
* platforms for the MADV_xxx flags listed below.
* To keep binary compatibility with existing userspace programs
* translate the former values to the new values.
*
* XXX: Remove this wrapper in year 2025 (or later)
*/
asmlinkage notrace long parisc_madvise(unsigned long start, size_t len_in, int behavior)
{
switch (behavior) {
case 65: behavior = MADV_MERGEABLE; break;
case 66: behavior = MADV_UNMERGEABLE; break;
case 67: behavior = MADV_HUGEPAGE; break;
case 68: behavior = MADV_NOHUGEPAGE; break;
case 69: behavior = MADV_DONTDUMP; break;
case 70: behavior = MADV_DODUMP; break;
case 71: behavior = MADV_WIPEONFORK; break;
case 72: behavior = MADV_KEEPONFORK; break;
case 73: behavior = MADV_COLLAPSE; break;
}
return sys_madvise(start, len_in, behavior);
}

2
arch/parisc/kernel/syscalls/syscall.tbl
View File

@ -131,7 +131,7 @@
116 common sysinfo sys_sysinfo compat_sys_sysinfo
117 common shutdown sys_shutdown
118 common fsync sys_fsync
119 common madvise sys_madvise
119 common madvise parisc_madvise
120 common clone sys_clone_wrapper
121 common setdomainname sys_setdomainname
122 common sendfile sys_sendfile compat_sys_sendfile

12
tools/arch/parisc/include/uapi/asm/mman.h
View File

@ -1,20 +1,20 @@
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef TOOLS_ARCH_PARISC_UAPI_ASM_MMAN_FIX_H
#define TOOLS_ARCH_PARISC_UAPI_ASM_MMAN_FIX_H
#define MADV_DODUMP 70
#define MADV_DODUMP 17
#define MADV_DOFORK 11
#define MADV_DONTDUMP 69
#define MADV_DONTDUMP 16
#define MADV_DONTFORK 10
#define MADV_DONTNEED 4
#define MADV_FREE 8
#define MADV_HUGEPAGE 67
#define MADV_MERGEABLE 65
#define MADV_NOHUGEPAGE 68
#define MADV_HUGEPAGE 14
#define MADV_MERGEABLE 12
#define MADV_NOHUGEPAGE 15
#define MADV_NORMAL 0
#define MADV_RANDOM 1
#define MADV_REMOVE 9
#define MADV_SEQUENTIAL 2
#define MADV_UNMERGEABLE 66
#define MADV_UNMERGEABLE 13
#define MADV_WILLNEED 3
#define MAP_ANONYMOUS 0x10
#define MAP_DENYWRITE 0x0800

12
tools/perf/bench/bench.h
View File

@ -10,25 +10,13 @@ extern struct timeval bench__start, bench__end, bench__runtime;
* The madvise transparent hugepage constants were added in glibc
* 2.13. For compatibility with older versions of glibc, define these
* tokens if they are not already defined.
*
* PA-RISC uses different madvise values from other architectures and
* needs to be special-cased.
*/
#ifdef __hppa__
# ifndef MADV_HUGEPAGE
# define MADV_HUGEPAGE 67
# endif
# ifndef MADV_NOHUGEPAGE
# define MADV_NOHUGEPAGE 68
# endif
#else
# ifndef MADV_HUGEPAGE
# define MADV_HUGEPAGE 14
# endif
# ifndef MADV_NOHUGEPAGE
# define MADV_NOHUGEPAGE 15
# endif
#endif
int bench_numa(int argc, const char **argv);
int bench_sched_messaging(int argc, const char **argv);