linux-stable.git/arch/arm/kernel, branch linux-2.6.29.y

ARM: 5428/1: Module relocation update for R_ARM_V4BX

2009-04-02T20:55:18+00:00

upstream commit: 4731f8b66dd34ebf0e67ca6ba9162b0e509bec06

It would seem when building kernel modules with modern binutils
(required by modern GCC) for ARM v4T targets (specifically observed
with the Samsung 24xx SoC which is an 920T) R_ARM_V4BX relocations
are emitted for function epilogues.

This manifests at module load time with an "unknown relocation: 40"
error message.

The following patch adds the R_ARM_V4BX relocation to the ARM kernel
module loader. The relocation operation is taken from that within the
binutils bfd library.

Signed-off-by: Simtec Linux Team 
Signed-off-by: Vincent Sanders 
Signed-off-by: Russell King 
Signed-off-by: Chris Wright

[ARM] 5421/1: ftrace: fix crash due to tracing of __naked functions

2009-03-12T21:33:03+00:00

This is a fix for the following crash observed in 2.6.29-rc3:
http://lkml.org/lkml/2009/1/29/150

On ARM it doesn't make sense to trace a naked function because then
mcount is called without stack and frame pointer being set up and there
is no chance to restore the lr register to the value before mcount was
called.

Reported-by: Matthias Kaehlcke 
Tested-by: Matthias Kaehlcke 

Cc: Abhishek Sagar 
Cc: Steven Rostedt 
Cc: Ingo Molnar 
Signed-off-by: Uwe Kleine-König 
Signed-off-by: Russell King

[ARM] 5418/1: restore lr before leaving mcount

2009-03-05T13:47:15+00:00

gcc seems to expect that lr isn't clobbered by mcount, because for a
function starting with:

	static int func(void)
	{
		void *ra = __builtin_return_address(0);

		printk(KERN_EMERG "__builtin_return_address(0) = %pS\n", ra)

		...

the following assembler is generated by gcc 4.3.2:

	   0:   e1a0c00d        mov     ip, sp
	   4:   e92dd810        push    {r4, fp, ip, lr, pc}
	   8:   e24cb004        sub     fp, ip, #4      ; 0x4
	   c:   ebfffffe        bl      0 
	  10:   e59f0034        ldr     r0, [pc, #52]
	  14:   e1a0100e        mov     r1, lr
	  18:   ebfffffe        bl      0 

Without this patch obviously __builtin_return_address(0) yields
func+0x10 instead of the return address of the caller.

Note this patch fixes a similar issue for the routines used with dynamic
ftrace even though this isn't currently selectable for ARM.

Cc: Abhishek Sagar 
Cc: Steven Rostedt 
Cc: Ingo Molnar 
Signed-off-by: Uwe Kleine-König 
Signed-off-by: Russell King

[ARM] 5417/1: Set the correct cacheid for ARMv6 CPUs with ARMv7 style MMU

2009-03-03T12:11:26+00:00

The cacheid_init() function assumes that if cpu_architecture() returns
7, the caches are VIPT_NONALIASING. The cpu_architecture() function
returns the version of the supported MMU features (e.g. TEX remapping)
but it doesn't make any assumptions about the cache type. The patch adds
the checking of the Cache Type Register for the ARMv7 format.

Signed-off-by: Catalin Marinas 
Signed-off-by: Russell King

[ARM] 5404/1: Fix condition in arm_elf_read_implies_exec() to set READ_IMPLIES_EXEC

2009-02-19T14:45:27+00:00

READ_IMPLIES_EXEC must be set when:
o binary _is_ an executable stack (i.e. not EXSTACK_DISABLE_X)
o processor architecture is _under_ ARMv6 (XN bit is supported from ARMv6)

Signed-off-by: Makito SHIOKAWA 
Signed-off-by: Russell King

[ARM] Storage class should be before const qualifier

2009-02-10T09:59:19+00:00

The C99 specification states in section 6.11.5:

The placement of a storage-class specifier other than at the beginning of the
declaration specifiers in a declaration is an obsolescent feature.

Signed-off-by: Tobias Klauser 
Signed-off-by: Russell King

annotate that [fp, #-4] is the saved lr

2009-01-31T00:21:56+00:00

Signed-off-by: Uwe Kleine-König

Use __SPIN_LOCK_UNLOCKED to initialize bad_irq_desc.lock

2009-01-31T00:21:55+00:00

SPIN_LOCK_UNLOCKED is deprecated as lockdep cannot properly work with
locks initialized with it.

This fix is necessary to compile the linux-rt tree for ARM.

Signed-off-by: Uwe Kleine-König 
Cc: Steven Rostedt

[ARM] call undefined instruction exception handler with irqs enabled

2009-01-28T10:19:53+00:00

Aaro says:
> With spinlock debugs enabled I get might_sleep() warnings when using
> ptrace.

tracked down to a missing enable_irq before calling do_undefinstr().

Reported-by: Aaro Koskinen 
Tested-by: Aaro Koskinen 
Signed-off-by: Russell King

[CVE-2009-0029] Rename old_readdir to sys_old_readdir

2009-01-14T13:15:15+00:00

This way it matches the generic system call name convention.

Signed-off-by: Heiko Carstens