linux-stable.git/arch/arm/Kconfig.debug, branch linux-4.9.y

ARM: fix function graph tracer and unwinder dependencies

2022-10-26T11:15:33+00:00

commit 503621628b32782a07b2318e4112bd4372aa3401 upstream.

Naresh Kamboju recently reported that the function-graph tracer crashes
on ARM. The function-graph tracer assumes that the kernel is built with
frame pointers.

We explicitly disabled the function-graph tracer when building Thumb2,
since the Thumb2 ABI doesn't have frame pointers.

We recently changed the way the unwinder method was selected, which
seems to have made it more likely that we can end up with the function-
graph tracer enabled but without the kernel built with frame pointers.

Fix up the function graph tracer dependencies so the option is not
available when we have no possibility of having frame pointers, and
adjust the dependencies on the unwinder option to hide the non-frame
pointer unwinder options if the function-graph tracer is enabled.

Reviewed-by: Masami Hiramatsu 
Tested-by: Masami Hiramatsu 
Signed-off-by: Russell King 
Signed-off-by: Sebastian Andrzej Siewior 
Reported-by: Danilo Cezar Zanella 
Signed-off-by: Greg Kroah-Hartman

ARM: 8800/1: use choice for kernel unwinders

2022-01-29T09:15:58+00:00

commit f9b58e8c7d031b0daa5c9a9ee27f5a4028ba53ac upstream.

While in theory multiple unwinders could be compiled in, it does
not make sense in practise. Use a choice to make the unwinder
selection mutually exclusive and mandatory.

Already before this commit it has not been possible to deselect
FRAME_POINTER. Remove the obsolete comment.

Furthermore, to produce a meaningful backtrace with FRAME_POINTER
enabled the kernel needs a specific function prologue:
    mov    ip, sp
    stmfd    sp!, {fp, ip, lr, pc}
    sub    fp, ip, #4

To get to the required prologue gcc uses apcs and no-sched-prolog.
This compiler options are not available on clang, and clang is not
able to generate the required prologue. Make the FRAME_POINTER
config symbol depending on !clang.

Suggested-by: Arnd Bergmann 
Signed-off-by: Stefan Agner 
Reviewed-by: Arnd Bergmann 
Signed-off-by: Russell King 
Signed-off-by: Anders Roxell 
Signed-off-by: Greg Kroah-Hartman

ARM: debug: enable UART1 for socfpga Cyclone5

2019-12-21T09:41:13+00:00

[ Upstream commit f6628486c8489e91c513b62608f89ccdb745600d ]

Cyclone5 and Arria10 doesn't have the same memory map for UART1.

Split the SOCFPGA_UART1 into 2 options to allow debugging on UART1 for Cyclone5.

Signed-off-by: Clément Péron 
Signed-off-by: Dinh Nguyen 
Signed-off-by: Sasha Levin

ARM: debug-imx: only define DEBUG_IMX_UART_PORT if needed

2019-12-05T14:34:13+00:00

[ Upstream commit 7c41ea57beb2aee96fa63091a457b1a2826f3c42 ]

If debugging on i.MX is enabled DEBUG_IMX_UART_PORT defines which UART
is used for the debug output. If however debugging is off don't only
hide the then unused config item but drop it completely by using a
dependency instead of a conditional prompt.

This fixes DEBUG_IMX_UART_PORT being present in the kernel config even
if DEBUG_LL is disabled.

Signed-off-by: Uwe Kleine-König 
Signed-off-by: Shawn Guo 
Signed-off-by: Sasha Levin

Merge tag 'renesas-soc-for-v4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into next/soc

2016-09-14T22:27:27+00:00

Pull "Renesas ARM Based SoC Updates for v4.9" from Simon Horman:

Clean-up:
* Only use smp_init when SMP is selected

Enablement:
* Add debug-ll support for r8a7992

* tag 'renesas-soc-for-v4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
  ARM: shmobile: r8a7791: only use smp_init when SMP is selected
  ARM: shmobile: r8a7790: only use smp_init when SMP is selected
  ARM: debug-ll: Add support for r8a7992

ARM: debug-ll: Add support for r8a7992

2016-08-17T07:06:25+00:00

Enable low-level debugging support for R-Car V2H (r8a7792).
V2H uses SCIF0 for the debug console, like most other R-Car Gen2 SoCs.

Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Simon Horman

ARM: brcmstb: Add earlyprintk support using run-time checks

2016-08-08T18:14:09+00:00

The SUN_TOP_CTRL_FAMILY_ID register  is at a fixed absolute address for
all of our supported chips, so utilize its value to determine what the
UARTA base address should be based on the value we read.

Since the code is called both during decompressor when the MMU is off,
and after the MMU has been turned on in the kernel, and we want to do
the lookup only once, we use the same technique as tegra.S and have a
shared storage location between the decompressor and the kernel.

Signed-off-by: Florian Fainelli

Merge tag 'arm-soc/for-4.8/soc-part2' of http://github.com/Broadcom/stblinux into next/soc

2016-07-07T14:09:25+00:00

Merge "the second part of the Broadcom ARM-based SoC changes" from Florian Fainelli:

- Florian updates the DEBUG_UART_BCM5301X entry to cover both NS and NSP SoCs
  since they both have the same location

* tag 'arm-soc/for-4.8/soc-part2' of http://github.com/Broadcom/stblinux:
  ARM: debug: Enable DEBUG_BCM_5301X for Northstar Plus SoCs

ARM: debug: Enable DEBUG_BCM_5301X for Northstar Plus SoCs

2016-07-07T02:43:22+00:00

Northstar Plus SoCs (ARCH_BCM_NSP) have the exact same UART location and
properties like the register shift of 0, so make it usable.

Acked-by: Jon Mason 
Signed-off-by: Florian Fainelli

ARM: at91: debug: add default DEBUG_LL addresses

2016-06-10T15:09:28+00:00

Add configuration options for the most commonly used UART physical and
virtual addresses to ease the use of DEBUG_LL and earlyprintk.

Acked-by: Nicolas Ferre 
Signed-off-by: Alexandre Belloni