linux.git/arch/parisc/kernel, branch v3.10 Linux kernel source tree parisc: Use unshadowed index register for flush instructions in flush_dcache_page_asm and flush_icache_page_asm 2013-06-18T18:29:10+00:00 John David Anglin dave.anglin@bell.net 2013-06-02T16:21:48+00:00 d65ea48dc61ffdf6cd7f25b4c319bbd68015e018 The comment at the start of pacache.S states that the base and index registers used for fdc,fic, and pdc instructions should not use shadowed registers. Although this is probably unnecessary for tmpalias flushes, there is also no reason not to comply. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de> 
The comment at the start of pacache.S states that the base and index
registers used for fdc,fic, and pdc instructions should not use shadowed
registers. Although this is probably unnecessary for tmpalias flushes,
there is also no reason not to comply.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
parisc: provide pci_mmap_page_range() for parisc 2013-06-18T18:29:08+00:00 Thomas Bogendoerfer tsbogend@alpha.franken.de 2013-06-14T07:05:41+00:00 2cc7138f4347df939ce03f313e3d87794bab36f8 pci_mmap_page_range() is needed for X11-server support on C8000 with ATI FireGL card. Signed-off-by Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Helge Deller <deller@gmx.de> 
pci_mmap_page_range() is needed for X11-server support on C8000 with ATI
FireGL card.

Signed-off-by Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Helge Deller <deller@gmx.de>
parisc: fix serial ports on C8000 workstation 2013-06-18T18:29:07+00:00 Thomas Bogendoerfer tsbogend@alpha.franken.de 2013-06-09T21:00:21+00:00 9a66d1869d90f13fbaf83dcce5b1aeec86fbc699 The C8000 workstation (64 bit kernel only) has a somewhat different serial port configuration than other models. Thomas Bogendoerfer sent a patch to fix this in September 2010, which was now minimally modified by me. Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Helge Deller <deller@gmx.de> 
The C8000 workstation (64 bit kernel only) has a somewhat different
serial port configuration than other models.
Thomas Bogendoerfer sent a patch to fix this in September 2010, which
was now minimally modified by me.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Helge Deller <deller@gmx.de>
parisc: kernel: using strlcpy() instead of strcpy() 2013-06-01T12:29:01+00:00 Chen Gang gang.chen@asianux.com 2013-05-30T01:18:43+00:00 ea99b1adf22abd62bdcf14b1c9a0a4d3664eefd8 'boot_args' is an input args, and 'boot_command_line' has a fix length. So use strlcpy() instead of strcpy() to avoid memory overflow. Signed-off-by: Chen Gang <gang.chen@asianux.com> Acked-by: Kyle McMartin <kyle@mcmartin.ca> Signed-off-by: Helge Deller <deller@gmx.de> 
'boot_args' is an input args, and 'boot_command_line' has a fix length.
So use strlcpy() instead of strcpy() to avoid memory overflow.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Acked-by: Kyle McMartin <kyle@mcmartin.ca>
Signed-off-by: Helge Deller <deller@gmx.de>
parisc: memory overflow, 'name' length is too short for using 2013-06-01T12:27:56+00:00 Chen Gang gang.chen@asianux.com 2013-05-27T04:57:09+00:00 3f108de96ba449a8df3d7e3c053bf890fee2cb95 'path.bc[i]' can be asigned by PCI_SLOT() which can '> 10', so sizeof(6 * "%u:" + "%u" + '\0') may be 21. Since 'name' length is 20, it may be memory overflow. And 'path.bc[i]' is 'unsigned char' for printing, we can be sure the max length of 'name' must be less than 28. So simplify thinking, we can use 28 instead of 20 directly, and do not think of whether 'patchc.bc[i]' can '> 100'. Signed-off-by: Chen Gang <gang.chen@asianux.com> Signed-off-by: Helge Deller <deller@gmx.de> 
'path.bc[i]' can be asigned by PCI_SLOT() which can '> 10', so sizeof(6
* "%u:" + "%u" + '\0') may be 21.

Since 'name' length is 20, it may be memory overflow.

And 'path.bc[i]' is 'unsigned char' for printing, we can be sure the
max length of 'name' must be less than 28.

So simplify thinking, we can use 28 instead of 20 directly, and do not
think of whether 'patchc.bc[i]' can '> 100'.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Helge Deller <deller@gmx.de>
parisc: fix irq stack on UP and SMP 2013-05-24T21:29:01+00:00 Helge Deller deller@gmx.de 2013-05-24T21:27:35+00:00 d96b51ec14650b490ab98e738bcc02309396e5bc The logic to detect if the irq stack was already in use with raw_spin_trylock() is wrong, because it will generate a "trylock failure on UP" error message with CONFIG_SMP=n and CONFIG_DEBUG_SPINLOCK=y. arch_spin_trylock() can't be used either since in the CONFIG_SMP=n case no atomic protection is given and we are reentrant here. A mutex didn't worked either and brings more overhead by turning off interrupts. So, let's use the fastest path for parisc which is the ldcw instruction. Counting how often the irq stack was used is pretty useless, so just drop this piece of code. Signed-off-by: Helge Deller <deller@gmx.de> 
The logic to detect if the irq stack was already in use with
raw_spin_trylock() is wrong, because it will generate a "trylock failure
on UP" error message with CONFIG_SMP=n and CONFIG_DEBUG_SPINLOCK=y.

arch_spin_trylock() can't be used either since in the CONFIG_SMP=n case
no atomic protection is given and we are reentrant here. A mutex didn't
worked either and brings more overhead by turning off interrupts.

So, let's use the fastest path for parisc which is the ldcw instruction.

Counting how often the irq stack was used is pretty useless, so just
drop this piece of code.

Signed-off-by: Helge Deller <deller@gmx.de>
parisc: make interrupt and interruption stack allocation reentrant 2013-05-24T20:35:36+00:00 John David Anglin dave.anglin@bell.net 2013-05-20T16:42:53+00:00 b63a2bbc0b9b106a93e11952ab057e2408f2eb02 The get_stack_use_cr30 and get_stack_use_r30 macros allocate a stack frame for external interrupts and interruptions requiring a stack frame. They are currently not reentrant in that they save register context before the stack is set or adjusted. I have observed a number of system crashes where there was clear evidence of stack corruption during interrupt processing, and as a result register corruption. Some interruptions can still occur during interruption processing, however external interrupts are disabled and data TLB misses don't occur for absolute accesses. So, it's not entirely clear what triggers this issue. Also, if an interruption occurs when Q=0, it is generally not possible to recover as the shadowed registers are not copied. The attached patch reworks the get_stack_use_cr30 and get_stack_use_r30 macros to allocate stack before doing register saves. The new code is a couple of instructions shorter than the old implementation. Thus, it's an improvement even if it doesn't fully resolve the stack corruption issue. Based on limited testing, it improves SMP system stability. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de> 
The get_stack_use_cr30 and get_stack_use_r30 macros allocate a stack
frame for external interrupts and interruptions requiring a stack frame.
They are currently not reentrant in that they save register context
before the stack is set or adjusted.

I have observed a number of system crashes where there was clear
evidence of stack corruption during interrupt processing, and as a
result register corruption. Some interruptions can still occur during
interruption processing, however external interrupts are disabled and
data TLB misses don't occur for absolute accesses. So, it's not entirely
clear what triggers this issue. Also, if an interruption occurs when
Q=0, it is generally not possible to recover as the shadowed registers
are not copied.

The attached patch reworks the get_stack_use_cr30 and get_stack_use_r30
macros to allocate stack before doing register saves. The new code is a
couple of instructions shorter than the old implementation. Thus, it's
an improvement even if it doesn't fully resolve the stack corruption
issue. Based on limited testing, it improves SMP system stability.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
parisc: show number of FPE and unaligned access handler calls in /proc/interrupts 2013-05-24T20:35:26+00:00 Helge Deller deller@gmx.de 2013-05-18T19:35:44+00:00 d0c3be806a3fe7f4abdb0f7e7287addb55e73f35 Show number of floating point assistant and unaligned access fixup handler in /proc/interrupts file. Signed-off-by: Helge Deller <deller@gmx.de> 
Show number of floating point assistant and unaligned access fixup
handler in /proc/interrupts file.

Signed-off-by: Helge Deller <deller@gmx.de>
parisc: use PAGE_SHIFT instead of hardcoded value 12 in pacache.S 2013-05-24T20:30:28+00:00 Helge Deller deller@gmx.de 2013-05-16T20:51:41+00:00 d845b5fb36edbd16563bde49ae1217b3f5132eec additionally clean up some whitespaces & tabs. Signed-off-by: Helge Deller <deller@gmx.de> 
additionally clean up some whitespaces & tabs.

Signed-off-by: Helge Deller <deller@gmx.de>
parisc: add rp5470 entry to machine database 2013-05-24T20:30:20+00:00 Helge Deller deller@gmx.de 2013-05-16T20:42:39+00:00 949451b9b19da5e998778eb78929aafc73b5c227 Signed-off-by: Helge Deller <deller@gmx.de> 
Signed-off-by: Helge Deller <deller@gmx.de>