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597781f3e5
linux_dsm_epyc7002/arch/parisc/include/asm
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Cesar Eduardo Barros 597781f3e5 kmap_atomic: make kunmap_atomic() harder to misuse 
kunmap_atomic() is currently at level -4 on Rusty's "Hard To Misuse"
list[1] ("Follow common convention and you'll get it wrong"), except in
some architectures when CONFIG_DEBUG_HIGHMEM is set[2][3].

kunmap() takes a pointer to a struct page; kunmap_atomic(), however, takes
takes a pointer to within the page itself.  This seems to once in a while
trip people up (the convention they are following is the one from
kunmap()).

Make it much harder to misuse, by moving it to level 9 on Rusty's list[4]
("The compiler/linker won't let you get it wrong").  This is done by
refusing to build if the type of its first argument is a pointer to a
struct page.

The real kunmap_atomic() is renamed to kunmap_atomic_notypecheck()
(which is what you would call in case for some strange reason calling it
with a pointer to a struct page is not incorrect in your code).

The previous version of this patch was compile tested on x86-64.

[1] http://ozlabs.org/~rusty/index.cgi/tech/2008-04-01.html
[2] In these cases, it is at level 5, "Do it right or it will always
    break at runtime."
[3] At least mips and powerpc look very similar, and sparc also seems to
    share a common ancestor with both; there seems to be quite some
    degree of copy-and-paste coding here. The include/asm/highmem.h file
    for these three archs mention x86 CPUs at its top.
[4] http://ozlabs.org/~rusty/index.cgi/tech/2008-03-30.html
[5] As an aside, could someone tell me why mn10300 uses unsigned long as
    the first parameter of kunmap_atomic() instead of void *?

Signed-off-by: Cesar Eduardo Barros <cesarb@cesarb.net>
Cc: Russell King <linux@arm.linux.org.uk> (arch/arm)
Cc: Ralf Baechle <ralf@linux-mips.org> (arch/mips)
Cc: David Howells <dhowells@redhat.com> (arch/frv, arch/mn10300)
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> (arch/mn10300)
Cc: Kyle McMartin <kyle@mcmartin.ca> (arch/parisc)
Cc: Helge Deller <deller@gmx.de> (arch/parisc)
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> (arch/parisc)
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> (arch/powerpc)
Cc: Paul Mackerras <paulus@samba.org> (arch/powerpc)
Cc: "David S. Miller" <davem@davemloft.net> (arch/sparc)
Cc: Thomas Gleixner <tglx@linutronix.de> (arch/x86)
Cc: Ingo Molnar <mingo@redhat.com> (arch/x86)
Cc: "H. Peter Anvin" <hpa@zytor.com> (arch/x86)
Cc: Arnd Bergmann <arnd@arndb.de> (include/asm-generic)
Cc: Rusty Russell <rusty@rustcorp.com.au> ("Hard To Misuse" list)
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-09 20:44:54 -07:00
..
agp.h agp: kill phys_to_gart() and gart_to_phys() 2009-08-03 09:05:00 +01:00
asm-offsets.h kbuild: move asm-offsets.h to include/generated 2009-12-12 13:08:14 +01:00
asmregs.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
assembly.h parisc: fix 64bit build 2009-03-13 01:18:56 -04:00
atomic.h atomic_t: Cast to volatile when accessing atomic variables 2010-05-17 07:57:27 -07:00
auxvec.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
bitops.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
bitsperlong.h asm-generic: introduce asm/bitsperlong.h 2009-06-11 21:02:14 +02:00
bug.h panic: Allow warnings to set different taint flags 2010-05-19 08:36:48 +01:00
bugs.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
byteorder.h byteorder: make swab.h include asm/swab.h like a regular header 2009-01-14 19:56:50 -08:00
cache.h Rename .data.read_mostly to .data..read_mostly. 2010-03-03 11:26:00 +01:00
cacheflush.h kmap_atomic: make kunmap_atomic() harder to misuse 2010-08-09 20:44:54 -07:00
checksum.h parisc: fix ipv6 checksum 2009-01-05 19:11:05 +00:00
compat_rt_sigframe.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
compat_signal.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
compat_ucontext.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
compat.h improve sys_newuname() for compat architectures 2010-03-12 15:52:32 -08:00
cputime.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
current.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
delay.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
device.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
div64.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
dma-mapping.h Documentation: move DMA-mapping.txt to Doc/PCI/ 2009-01-29 18:19:29 -08:00
dma.h parisc: remove CVS keywords 2009-07-03 03:34:06 +00:00
eisa_bus.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
eisa_eeprom.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
elf.h elf: kill USE_ELF_CORE_DUMP 2009-12-16 07:20:12 -08:00
emergency-restart.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
errno.h cfg80211: errno.h: define ERFKILL 2009-06-07 05:01:00 -07:00
fb.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
fcntl.h vfs: Implement proper O_SYNC semantics 2009-12-10 15:02:50 +01:00
fixmap.h parisc: rename parisc's vmalloc_start to parisc_vmalloc_start 2009-09-27 23:27:04 -04:00
floppy.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
ftrace.h parisc: add CALLER_ADDR{0-6} macros 2009-12-16 03:48:54 +00:00
futex.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
grfioctl.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
hardirq.h parisc: convert to asm-generic/hardirq.h 2009-09-28 00:24:23 -04:00
hardware.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
hw_irq.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
ide.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6 2008-10-20 14:40:31 -07:00
io.h parisc: define x->x mmio accessors 2009-03-13 01:20:48 -04:00
ioctl.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
ioctls.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
ipcbuf.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
irq_regs.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
irq.h parisc: convert cpu_check_affinity to new cpumask api 2009-03-13 01:20:27 -04:00
Kbuild byteorder: make swab.h include asm/swab.h like a regular header 2009-01-14 19:56:50 -08:00
kdebug.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
kmap_types.h kmap_types: make most arches use generic header file 2009-06-16 19:47:51 -07:00
led.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
linkage.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
local64.h arch: Implement local64_t 2010-06-09 11:12:36 +02:00
local.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
machdep.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
mc146818rtc.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
mckinley.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
mman.h mm: add MAP_HUGETLB for mmaping pseudo-anonymous huge page regions 2009-09-22 07:17:41 -07:00
mmu_context.h parisc: fix braino in commit adding __space_to_prot 2009-01-05 18:15:25 +00:00
mmu.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
mmzone.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
module.h parisc: fix module loading failure of large kernel modules 2009-01-05 08:40:14 +10:30
msgbuf.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
mutex.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
page.h asm-generic: rename page.h and uaccess.h 2009-06-11 21:02:17 +02:00
param.h parisc: Simplify param.h by including <asm-generic/param.h> 2010-03-06 22:54:10 +00:00
parisc-device.h parisc: struct device - replace bus_id with dev_name(), dev_set_name() 2008-11-26 22:22:41 +00:00
parport.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
pci.h pci-dma: add linux/pci-dma.h to linux/pci.h 2010-03-12 15:52:42 -08:00
pdc_chassis.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
pdc.h parisc: asm/pdc.h should include asm/page.h 2009-04-02 00:20:15 +00:00
pdcpat.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
percpu.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
perf_event.h perf: Do the big rename: Performance Counters -> Performance Events 2009-09-21 14:28:04 +02:00
perf.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
pgalloc.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
pgtable.h MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself 2010-02-20 16:41:46 +00:00
poll.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
posix_types.h parisc: __kernel_time_t is always long 2008-11-26 22:22:36 +00:00
prefetch.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
processor.h parisc: add task_pt_regs macro 2009-07-03 03:34:11 +00:00
psw.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
ptrace.h ptrace: move user_enable_single_step & co prototypes to linux/ptrace.h 2010-03-12 15:52:38 -08:00
real.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
resource.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
ropes.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
rt_sigframe.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
rtc.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
runway.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
scatterlist.h parisc: use asm-generic/scatterlist.h 2010-05-27 09:12:55 -07:00
sections.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
segment.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
sembuf.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
serial.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
setup.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
shmbuf.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
shmparam.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
sigcontext.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
siginfo.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6 2008-10-20 14:40:31 -07:00
signal.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
smp.h cpumask: remove arch_send_call_function_ipi 2009-09-24 09:34:47 +09:30
socket.h net: Generalize socket rx gap / receive queue overflow cmsg 2009-10-12 13:26:31 -07:00
sockios.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
spinlock_types.h locking: Convert raw_rwlock to arch_rwlock 2009-12-14 23:55:32 +01:00
spinlock.h locking: Convert raw_rwlock functions to arch_rwlock 2009-12-14 23:55:32 +01:00
stat.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
statfs.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6 2008-10-20 14:40:31 -07:00
string.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
superio.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
swab.h headers_check fix: parisc, swab.h 2009-02-01 11:01:27 +05:30
syscall.h parisc: add skeleton syscall.h 2009-09-27 23:07:23 -04:00
system.h Merge branch 'for-35' of git://repo.or.cz/linux-kbuild 2010-06-01 08:55:52 -07:00
termbits.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
termios.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
thread_info.h add descriptive comment for TIF_MEMDIE task flag declaration. 2010-05-14 11:13:27 +02:00
timex.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
tlb.h mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
tlbflush.h parisc: ensure broadcast tlb purge runs single threaded 2009-07-03 03:34:09 +00:00
topology.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
traps.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
types.h asm-generic: introduce asm/bitsperlong.h 2009-06-11 21:02:14 +02:00
uaccess.h parisc: add strict copy size checks (v2) 2010-03-06 22:54:09 +00:00
ucontext.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
unaligned.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
unistd.h parisc: ditto sys_accept4 2010-03-06 22:54:09 +00:00
unwind.h parisc: initialize unwinder much earlier 2008-10-10 16:32:30 +00:00
user.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
vga.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00
xor.h parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10 16:32:29 +00:00